Various 4D improvements:

- refactor work schedule visualisation operator
- Fix text handler
- Improve durations UI for task times (proposal to replicate for all durations)
- Simplify durations ( P32H as P4D or P1D8H)
- Implement years/months in various datetime calculations
- Feature to customise animation colors per construction task type
- Feature to add Visual task bars
- Feature to customise Visual task bar material colors
- Move helper functions from blenderbim.bim.module.sequence to ifcopenshell.util.sequence

src/blenderbim/blenderbim/bim/helper.py

@@ -43,16 +43,25 @@ def draw_attribute(attribute, layout, copy_operator=None):
         return
     if value_name == "enum_value":
         prop_with_search(layout, attribute, "enum_value", text=attribute.name)
+    elif attribute.name in ["ScheduleDuration", "ActualDuration", "FreeFloat", "TotalFloat"]:
+        propis = bpy.context.scene.BIMWorkScheduleProperties
+        for item in propis.durations_attributes:
+            if item.name == attribute.name:
+                duration_props = item
+                layout.label(text=attribute.name)
+                layout.prop(duration_props, "years", text="Y")
+                layout.prop(duration_props, "months", text="M")
+                layout.prop(duration_props, "days", text="D")
+                layout.prop(duration_props, "hours", text="H")
+                layout.prop(duration_props, "minutes", text="Min")
+                layout.prop(duration_props, "seconds", text="S")
+                break
     else:
         layout.prop(
             attribute,
             value_name,
             text=attribute.name,
         )
-    if "ScheduleDuration" in attribute.name:
-        layout.prop(bpy.context.scene.BIMDuration, "duration_days", text="D")
-        layout.prop(bpy.context.scene.BIMDuration, "duration_hours", text="H")
-        layout.prop(bpy.context.scene.BIMDuration, "duration_minutes", text="M")
 
     if attribute.is_optional:
         layout.prop(attribute, "is_null", icon="RADIOBUT_OFF" if attribute.is_null else "RADIOBUT_ON", text="")

src/blenderbim/blenderbim/bim/module/sequence/__init__.py

@@ -26,6 +26,7 @@ classes = (
     operator.AddSummaryTask,
     operator.AddTask,
     operator.AddTaskColumn,
+    operator.AddTaskBars,
     operator.AddTimePeriod,
     operator.AddWorkCalendar,
     operator.AddWorkPlan,
@@ -108,19 +109,23 @@ classes = (
     operator.UnassignWorkSchedule,
     operator.VisualiseWorkScheduleDate,
     operator.VisualiseWorkScheduleDateRange,
+    operator.LoadTaskAnimationColors,
+    operator.DisableEditingTaskAnimationColors,
     prop.WorkPlan,
     prop.BIMWorkPlanProperties,
     prop.Task,
     prop.TaskResource,
     prop.TaskProduct,
+    prop.BIMDuration,
     prop.BIMWorkScheduleProperties,
     prop.BIMTaskTreeProperties,
+    prop.BIMTaskTypeColor,
+    prop.BIMAnimationProperties,
     prop.WorkCalendar,
     prop.RecurrenceComponent,
     prop.BIMWorkCalendarProperties,
     prop.DatePickerProperties,
     prop.BIMDateTextProperties,
-    prop.BIMDuration,
     ui.BIM_PT_work_plans,
     ui.BIM_PT_work_schedules,
     ui.BIM_PT_work_calendars,
@@ -130,7 +135,9 @@ classes = (
     ui.BIM_UL_task_resources,
     ui.BIM_UL_task_outputs,
     ui.BIM_UL_tasks,
-    ui.BIM_PT_SequenceToolKit,
+    ui.BIM_PT_Task_Tools,
+    ui.BIM_PT_Task_Bar_Creator,
+    ui.BIM_UL_animation_colors,
 )
 
 
@@ -151,8 +158,8 @@ def register():
     bpy.types.Scene.BIMWorkScheduleProperties = bpy.props.PointerProperty(type=prop.BIMWorkScheduleProperties)
     bpy.types.Scene.BIMTaskTreeProperties = bpy.props.PointerProperty(type=prop.BIMTaskTreeProperties)
     bpy.types.Scene.BIMWorkCalendarProperties = bpy.props.PointerProperty(type=prop.BIMWorkCalendarProperties)
+    bpy.types.Scene.BIMAnimationProperties = bpy.props.PointerProperty(type=prop.BIMAnimationProperties)
     bpy.types.Scene.DatePickerProperties = bpy.props.PointerProperty(type=prop.DatePickerProperties)
-    bpy.types.Scene.BIMDuration = bpy.props.PointerProperty(type=prop.BIMDuration)
     bpy.types.TextCurve.BIMDateTextProperties = bpy.props.PointerProperty(type=prop.BIMDateTextProperties)
     bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
     bpy.types.TOPBAR_MT_file_import.append(menu_func_import)
@@ -164,7 +171,7 @@ def unregister():
     del bpy.types.Scene.BIMTaskTreeProperties
     del bpy.types.Scene.BIMWorkCalendarProperties
     del bpy.types.Scene.DatePickerProperties
-    del bpy.types.Scene.BIMDuration
+    del bpy.types.Scene.BIMAnimationProperties
     del bpy.types.TextCurve.BIMDateTextProperties
     bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
     bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)

src/blenderbim/blenderbim/bim/module/sequence/helper.py

@@ -19,26 +19,7 @@
 import isodate
 from dateutil import parser
 import ifcopenshell.util.date as ifcdateutils
-
-
-def derive_date(task, attribute_name, date=None, is_earliest=False, is_latest=False):
-    if task.TaskTime:
-        current_date = (
-            ifcdateutils.ifc2datetime(getattr(task.TaskTime, attribute_name))
-            if getattr(task.TaskTime, attribute_name)
-            else ""
-        )
-        if current_date:
-            return current_date
-    for subtask in get_all_nested_tasks(task):
-        current_date = derive_date(subtask, attribute_name, date=date, is_earliest=is_earliest, is_latest=is_latest)
-        if is_earliest:
-            if current_date and (date is None or current_date < date):
-                date = current_date
-        if is_latest:
-            if current_date and (date is None or current_date > date):
-                date = current_date
-    return date
+from datetime import timedelta
 
 
 def parse_datetime(value):
@@ -64,88 +45,77 @@ def canonicalise_time(time):
     return time.strftime("%d/%m/%y")
 
 
-def get_nested_tasks(task):
-    return [
-        related_object
-        for rel in task.IsNestedBy
-        for related_object in rel.RelatedObjects
-        if related_object.is_a("IfcTask")
-    ]
+def parse_duration_as_blender_props(dt):
+    seconds = dt.seconds
+    hours, seconds = divmod(seconds, 3600)
+    minutes, seconds = divmod(seconds, 60)
+    days = dt.days
+    months = int(getattr(dt, "months", 0))
+    years = int(getattr(dt, "years", 0))
+    return {
+        "years": years,
+        "months": months,
+        "days": days if days else 0,
+        "hours": hours if hours else 0,
+        "minutes": minutes if minutes else 0,
+        "seconds": seconds if seconds else 0,
+    }
 
 
-def get_parent_task(task):
-    return task.Nests[0].RelatingObject if task.Nests and task.Nests[0].RelatingObject.is_a("IfcTask") else None
+def simplify_duration(durations_attributes, duration_type, prop_name):
+    for item in durations_attributes:
+        if item.name == prop_name:
+            duration_props = item
+            print(duration_props, "duration_props")
+    if duration_props and not duration_type or duration_type == "ELAPSEDTIME":
+        duration_string = "P{}Y{}M{}DT{}H{}M{}S".format(
+            duration_props.years if duration_props.years else 0,
+            duration_props.months if duration_props.months else 0,
+            duration_props.days if duration_props.days else 0,
+            duration_props.hours if duration_props.hours else 0,
+            duration_props.minutes if duration_props.minutes else 0,
+            duration_props.seconds if duration_props.seconds else 0,
+        )
+        duration_object = ifcdateutils.ifc2datetime(duration_string)
+    elif duration_props and duration_type == "WORKTIME":
+        years = (duration_props.years * 365 * 24 * 60 * 60) if duration_props.years else 0
+        months = (duration_props.months * 30 * 24 * 60 * 60) if duration_props.months else 0
+        days = (duration_props.days * 24 * 60 * 60) if duration_props.days else 0
+        days_subtotal = (years + months + days) / (24 * 60 * 60)
 
+        hours = (duration_props.hours * 60 * 60) if duration_props.hours else 0
+        minutes = (duration_props.minutes * 60) if duration_props.minutes else 0
+        seconds = duration_props.seconds if duration_props.seconds else 0
+        total_seconds = hours + minutes + seconds
 
-def get_task_work_schedule(task):
-    parent_task = get_parent_task(task)
-    if parent_task:
-        get_task_work_schedule(parent_task)
-    else:
-        schedules = [
-            rel.RelatingControl
-            for rel in task.HasAssignments
-            if rel.is_a("IfcRelAssignsToControl") and rel.RelatingControl.is_a("IfcWorkSchedule")
-        ]
-        print(f"Returning {schedules}")
-        return schedules
+        # TODO: implement actual calendar worktime
+        calendar_seconds_per_day = 8 * 60 * 60
+        extra_days, seconds_left = divmod(total_seconds, calendar_seconds_per_day)
+        total_days = days_subtotal + extra_days
+        duration_object = timedelta(days=total_days, seconds=seconds_left)
+    if duration_object:
+        total_days = int(duration_object.days)
+        seconds_left = int(duration_object.seconds)
+        years, days = divmod(total_days, 365)
+        if hasattr(duration_object, "years"):
+            years += duration_object.years
 
+        months, days = divmod(days, 30)
+        if hasattr(duration_object, "months"):
+            months += duration_object.months
 
-def get_all_nested_tasks(task):
-    for nested_task in get_nested_tasks(task):
-        yield nested_task
-        yield from get_all_nested_tasks(nested_task)
+        if months >= 12:
+            extra_years, months = divmod(months, 12)
+            years += extra_years
 
+        hours, seconds = divmod(seconds_left, 3600)
+        minutes, seconds = divmod(seconds, 60)
 
-def get_work_schedule_tasks(work_schedule):
-    tasks = []
-    for root_task in get_root_tasks(work_schedule):
-        nested_tasks = get_all_nested_tasks(root_task)
-        tasks.extend(nested_tasks)
-    return tasks
-
-
-def get_root_tasks(work_schedule):
-    return [obj for rel in work_schedule.Controls for obj in rel.RelatedObjects if obj.is_a("IfcTask")]
-
-
-def get_root_tasks_ids(work_schedule):
-    return [obj.id() for rel in work_schedule.Controls for obj in rel.RelatedObjects if obj.is_a("IfcTask")]
-
-
-def guess_date_range(work_schedule):
-    earliest = None
-    latest = None
-    root_tasks = get_root_tasks(work_schedule)
-    tasks_with_assignements = []
-    for task in root_tasks:
-        if has_task_outputs(task):
-            tasks_with_assignements.append(task)
-        for sub_task in get_all_nested_tasks(task):
-            if has_task_outputs(sub_task):
-                tasks_with_assignements.append(sub_task)
-
-    for task in tasks_with_assignements:
-        derived_start = derive_date(task, "ScheduleStart", is_earliest=True)
-        derived_finish = derive_date(task, "ScheduleFinish", is_latest=True)
-        if derived_start and (not earliest or derived_start < earliest):
-            earliest = derived_start
-        if derived_finish and (not latest or derived_finish > latest):
-            latest = derived_finish
-    return earliest, latest
-
-
-def get_direct_task_outputs(task):
-    return [rel.RelatingProduct for rel in task.HasAssignments if rel.is_a("IfcRelAssignsToProduct")]
-
-
-def get_task_outputs(task, is_deep=False):
-    if not is_deep:
-        return get_direct_task_outputs(task)
-    else:
-        nested_tasks = get_all_nested_tasks(task)
-        return [output for nested_task in nested_tasks for output in get_direct_task_outputs(nested_task)]
-
-
-def has_task_outputs(task):
-    return len(get_task_outputs(task)) > 0
+        return "P{}Y{}M{}DT{}H{}M{}S".format(
+            int(years),
+            int(months),
+            int(days),
+            int(hours),
+            int(minutes),
+            int(seconds),
+        )

src/blenderbim/blenderbim/bim/module/sequence/operator.py

@@ -35,19 +35,6 @@ from ifcopenshell.api.sequence.data import Data
 from ifcopenshell.api.resource.data import Data as ResourceData
 
 
-def animate_text(scene, context):
-    data = bpy.data.curves.get("Timeline")
-    if not data or not bpy.data.objects.get("Timeline"):
-        self.remove_text_animation_handler()
-        scene.frame_current
-    props = data.BIMDateTextProperties
-    start = parser.parse(props.start, dayfirst=True, fuzzy=True)
-    finish = parser.parse(props.finish, dayfirst=True, fuzzy=True)
-    duration = finish - start
-    frame_date = (((scene.frame_current - props.start_frame) / props.total_frames) * duration) + start
-    data.body = frame_date.date().isoformat()
-
-
 class AddWorkPlan(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "bim.add_work_plan"
     bl_label = "Add Work Plan"
@@ -1104,239 +1091,9 @@ class VisualiseWorkScheduleDateRange(bpy.types.Operator):
     work_schedule: bpy.props.IntProperty()
 
     def execute(self, context):
-        self.file = IfcStore.get_file()
-        self.props = context.scene.BIMWorkScheduleProperties
-        self.start = parser.parse(self.props.visualisation_start, dayfirst=True, fuzzy=True)
-        self.finish = parser.parse(self.props.visualisation_finish, dayfirst=True, fuzzy=True)
-        self.duration = self.finish - self.start
-        self.start_frame = 1
-        self.total_frames = self.calculate_total_frames(context)
-        self.preprocess_tasks()
-
-        for obj in bpy.data.objects:
-            if not obj.BIMObjectProperties.ifc_definition_id:
-                continue
-            self.earliest_frame = None
-            product_frames = self.product_frames.get(obj.BIMObjectProperties.ifc_definition_id, [])
-            for product_frame in product_frames:
-                if product_frame["relationship"] == "input":
-                    self.animate_input(obj, product_frame)
-                elif product_frame["relationship"] == "output":
-                    self.animate_output(obj, product_frame)
-        self.add_text_animation_handler()
-
-        area = next(area for area in context.screen.areas if area.type == "VIEW_3D")
-        area.spaces[0].shading.color_type = "OBJECT"
-        context.scene.frame_start = self.start_frame
-        context.scene.frame_end = int(self.start_frame + self.total_frames)
-        # with open("/home/dion/animation.json", "w") as json_file:
-        #    guid_frames = {}
-        #    for k, v in self.product_frames.items():
-        #        guid_frames[self.file.by_id(k).GlobalId] = v
-        #    json.dump(guid_frames, json_file)
+        core.visualise_work_schedule_date_range(tool.Sequence, work_schedule=tool.Ifc.get().by_id(self.work_schedule))
         return {"FINISHED"}
 
-    def add_text_animation_handler(self):
-        data = bpy.data.curves.get("Timeline")
-        if not data:
-            data = bpy.data.curves.new(type="FONT", name="Timeline")
-        obj = bpy.data.objects.get("Timeline")
-        if not obj:
-            obj = bpy.data.objects.new(name="Timeline", object_data=data)
-            bpy.context.scene.collection.objects.link(obj)
-        obj.data.BIMDateTextProperties.start_frame = self.start_frame
-        obj.data.BIMDateTextProperties.total_frames = int(self.total_frames)
-        obj.data.BIMDateTextProperties.start = self.props.visualisation_start
-        obj.data.BIMDateTextProperties.finish = self.props.visualisation_finish
-        bpy.app.handlers.frame_change_post.append(animate_text)
-
-    def remove_text_animation_handler(self):
-        bpy.app.handlers.frame_change_post.remove(animate_text)
-
-    def animate_input(self, obj, product_frame):
-        if product_frame["type"] in ["LOGISTIC", "MOVE", "DISPOSAL"]:
-            self.animate_movement_from(obj, product_frame)
-        elif product_frame["type"] in ["DEMOLITION", "DISMANTLE", "DISPOSAL", "REMOVAL"]:
-            self.animate_destruction(obj, product_frame)
-        else:
-            self.animate_consumption(obj, product_frame)
-
-    def animate_output(self, obj, product_frame):
-        if product_frame["type"] in ["CONSTRUCTION", "INSTALLATION", "NOTDEFINED"]:
-            self.animate_creation(obj, product_frame)
-        elif product_frame["type"] in ["ATTENDANCE", "MAINTENANCE", "OPERATION", "RENOVATION"]:
-            self.animate_operation(obj, product_frame)
-        elif product_frame["type"] in ["LOGISTIC", "MOVE", "DISPOSAL"]:
-            self.animate_movement_to(obj, product_frame)
-        else:
-            self.animate_operation(obj, product_frame)
-
-    def animate_creation(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.hide_viewport = True
-            obj.hide_render = True
-            obj.keyframe_insert(data_path="hide_viewport", frame=self.start_frame)
-            obj.keyframe_insert(data_path="hide_render", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.hide_viewport = False
-        obj.hide_render = False
-        obj.color = (0.0, 1.0, 0.0, 1)
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"])
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"])
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.color = (1.0, 1.0, 1.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-
-    def animate_destruction(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.color = (1.0, 1.0, 1.0, 1)
-            obj.hide_viewport = False
-            obj.hide_render = False
-            obj.keyframe_insert(data_path="color", frame=self.start_frame)
-            obj.keyframe_insert(data_path="hide_viewport", frame=self.start_frame)
-            obj.keyframe_insert(data_path="hide_render", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
-        obj.color = (1.0, 0.0, 0.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.hide_viewport = True
-        obj.hide_render = True
-        obj.color = (0.0, 0.0, 0.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
-
-    def animate_operation(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.color = (1.0, 1.0, 1.0, 1)
-            obj.keyframe_insert(data_path="color", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
-        obj.color = (0.0, 0.0, 1.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.color = (1.0, 1.0, 1.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-
-    def animate_movement_to(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.hide_viewport = True
-            obj.hide_render = True
-            obj.keyframe_insert(data_path="hide_viewport", frame=self.start_frame)
-            obj.keyframe_insert(data_path="hide_render", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.hide_viewport = False
-        obj.hide_render = False
-        obj.color = (1.0, 1.0, 0.0, 1)
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"])
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"])
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.color = (1.0, 1.0, 1.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-
-    def animate_movement_from(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.color = (1.0, 1.0, 1.0, 1)
-            obj.keyframe_insert(data_path="color", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.hide_viewport = False
-        obj.hide_render = False
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"] - 1)
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"] - 1)
-        obj.color = (1.0, 0.5, 0.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.hide_viewport = True
-        obj.hide_render = True
-        obj.color = (0.0, 0.0, 0.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
-
-    def animate_consumption(self, obj, product_frame):
-        if self.earliest_frame is None or product_frame["STARTED"] < self.earliest_frame:
-            obj.color = (1.0, 1.0, 1.0, 1)
-            obj.keyframe_insert(data_path="color", frame=self.start_frame)
-            self.earliest_frame = product_frame["STARTED"]
-        obj.hide_viewport = False
-        obj.hide_render = False
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"] - 1)
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"] - 1)
-        obj.color = (0.0, 1.0, 1.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
-        obj.hide_viewport = True
-        obj.hide_render = True
-        obj.color = (0.0, 0.0, 0.0, 1)
-        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
-        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
-
-    def calculate_total_frames(self, context):
-        if self.props.speed_types == "FRAME_SPEED":
-            return self.calculate_using_frames(
-                self.start,
-                self.finish,
-                self.props.speed_animation_frames,
-                isodate.parse_duration(self.props.speed_real_duration),
-            )
-        elif self.props.speed_types == "DURATION_SPEED":
-            return self.calculate_using_duration(
-                self.start,
-                self.finish,
-                context.scene.render.fps,
-                isodate.parse_duration(self.props.speed_animation_duration),
-                isodate.parse_duration(self.props.speed_real_duration),
-            )
-        elif self.props.speed_types == "MULTIPLIER_SPEED":
-            return self.calculate_using_multiplier(
-                self.start,
-                self.finish,
-                context.scene.render.fps,
-                self.props.speed_multiplier,
-            )
-
-    def calculate_using_multiplier(self, start, finish, fps, multiplier):
-        animation_time = (finish - start) / multiplier
-        return animation_time.total_seconds() * fps
-
-    def calculate_using_duration(self, start, finish, fps, animation_duration, real_duration):
-        return self.calculate_using_multiplier(start, finish, fps, real_duration / animation_duration)
-
-    def calculate_using_frames(self, start, finish, animation_frames, real_duration):
-        return ((finish - start) / real_duration) * animation_frames
-
-    def preprocess_tasks(self):
-        self.product_frames = {}
-        for rel in self.file.by_id(self.work_schedule).Controls or []:
-            for related_object in rel.RelatedObjects:
-                if related_object.is_a("IfcTask"):
-                    self.preprocess_task(related_object)
-
-    def preprocess_task(self, task):
-        for rel in task.IsNestedBy or []:
-            for related_object in rel.RelatedObjects:
-                self.preprocess_task(related_object)
-        start = helper.derive_date(task, "ScheduleStart", is_earliest=True)
-        finish = helper.derive_date(task, "ScheduleFinish", is_latest=True)
-        if not start or not finish:
-            return
-        if not Data.is_loaded:
-            Data.load(self.file)  # TO DO: REFACTOR OPERATOR
-        for output_id in Data.tasks[task.id()]["Outputs"]:
-            self.add_product_frame(output_id, task, start, finish, "output")
-        for input_id in Data.tasks[task.id()]["Inputs"]:
-            self.add_product_frame(input_id, task, start, finish, "input")
-
-    def add_product_frame(self, product_id, task, start, finish, relationship):
-        self.product_frames.setdefault(product_id, []).append(
-            {
-                "type": task.PredefinedType,
-                "relationship": relationship,
-                "STARTED": round(self.start_frame + (((start - self.start) / self.duration) * self.total_frames)),
-                "COMPLETED": round(self.start_frame + (((finish - self.start) / self.duration) * self.total_frames)),
-            }
-        )
-
 
 class BlenderBIM_DatePicker(bpy.types.Operator):
     bl_label = "Date Picker"
@@ -1567,3 +1324,34 @@ class ContractAllTasks(bpy.types.Operator, tool.Ifc.Operator):
 
     def _execute(self, context):
         core.contract_all_tasks(tool.Sequence)
+
+
+class AddTaskBars(bpy.types.Operator):
+    bl_idname = "bim.add_task_bars"
+    bl_label = "Show Task Bars"
+    bl_options = {"REGISTER", "UNDO"}
+    bl_description = "Shows the Status of each task"
+
+    def execute(self, context):
+        core.add_task_bars(tool.Sequence)
+        return {"FINISHED"}
+
+
+class LoadTaskAnimationColors(bpy.types.Operator):
+    bl_idname = "bim.enable_editing_task_animation_colors"
+    bl_label = "Load Animation Colors"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        core.enable_editing_task_animation_colors(tool.Sequence)
+        return {"FINISHED"}
+
+
+class DisableEditingTaskAnimationColors(bpy.types.Operator):
+    bl_idname = "bim.disable_editing_task_animation_colors"
+    bl_label = "Disable Editing Colors"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        core.disable_editing_task_animation_colors(tool.Sequence)
+        return {"FINISHED"}

src/blenderbim/blenderbim/bim/module/sequence/prop.py

@@ -249,6 +249,28 @@ def update_visualisation_start_finish(self, context, startfinish):
         setattr(self, startfinish, canonical_value)
 
 
+def update_color_full(self, context):
+    material = bpy.data.materials.get("color_full")
+    if material:
+        color_full = bpy.context.scene.BIMAnimationProperties.color_full
+        inputs = material.node_tree.nodes["Principled BSDF"].inputs
+        color = inputs["Base Color"].default_value
+        color[0] = color_full.r
+        color[1] = color_full.g
+        color[2] = color_full.b
+
+
+def update_color_progress(self, context):
+    material = bpy.data.materials.get("color_progress")
+    if material:
+        color_progress = bpy.context.scene.BIMAnimationProperties.color_progress
+        inputs = material.node_tree.nodes["Principled BSDF"].inputs
+        color = inputs["Base Color"].default_value
+        color[0] = color_progress.r
+        color[1] = color_progress.g
+        color[2] = color_progress.b
+
+
 class Task(PropertyGroup):
     name: StringProperty(name="Name", update=updateTaskName)
     identification: StringProperty(name="Identification", update=updateTaskIdentification)
@@ -256,6 +278,7 @@ class Task(PropertyGroup):
     has_children: BoolProperty(name="Has Children")
     is_selected: BoolProperty(name="Is Selected")
     is_expanded: BoolProperty(name="Is Expanded")
+    has_bar_visual: BoolProperty(name="Bar Visualization", default=False)
     level_index: IntProperty(name="Level Index")
     duration: StringProperty(name="Duration", update=updateTaskDuration)
     start: StringProperty(name="Start", update=updateTaskTimeStart)
@@ -294,7 +317,18 @@ class BIMWorkPlanProperties(PropertyGroup):
     work_schedules: EnumProperty(items=getWorkSchedules, name="Work Schedules")
 
 
+class BIMDuration(PropertyGroup):
+    name: StringProperty(name="Attribute")
+    years: IntProperty(name="Years")
+    months: IntProperty(name="Months")
+    days: IntProperty(name="Days ")
+    hours: IntProperty(name="Hours")
+    minutes: IntProperty(name="Minutes")
+    seconds: IntProperty(name="Seconds")
+
+
 class BIMWorkScheduleProperties(PropertyGroup):
+    durations_attributes: CollectionProperty(name="Durations Attributes", type=BIMDuration)
     work_calendars: EnumProperty(items=getWorkCalendars, name="Work Calendars")
     work_schedule_attributes: CollectionProperty(name="Work Schedule Attributes", type=Attribute)
     editing_type: StringProperty(name="Editing Type")
@@ -305,6 +339,7 @@ class BIMWorkScheduleProperties(PropertyGroup):
     active_task_id: IntProperty(name="Active Task Id")
     task_attributes: CollectionProperty(name="Task Attributes", type=Attribute)
     should_show_visualisation_ui: BoolProperty(name="Should Show Visualisation UI", default=False)
+    should_show_bar_visual_option: BoolProperty(name="Should Show Settings UI", default=False)
     should_show_column_ui: BoolProperty(name="Should Show Column UI", default=False)
     columns: CollectionProperty(name="Columns", type=Attribute)
     active_column_index: IntProperty(name="Active Column Index")
@@ -358,13 +393,6 @@ class BIMWorkScheduleProperties(PropertyGroup):
     is_nested_task_outputs: BoolProperty(
         name="Is Nested Task Outputs", default=False, update=update_active_task_outputs
     )
-    active_nested_task_output_index: IntProperty(name="Active Nested Tasks Output Index")
-
-
-class BIMDuration(PropertyGroup):
-    duration_days: IntProperty(name="Days ")
-    duration_hours: IntProperty(name="Hours")
-    duration_minutes: IntProperty(name="Minutes")
 
 
 class BIMTaskTreeProperties(PropertyGroup):
@@ -423,3 +451,42 @@ class BIMDateTextProperties(PropertyGroup):
     total_frames: IntProperty(name="Total Frames")
     start: StringProperty(name="Start")
     finish: StringProperty(name="Finish")
+
+
+class BIMTaskTypeColor(PropertyGroup):
+    name: StringProperty(name="Name")
+    animation_type: StringProperty(name="Type")
+    color: FloatVectorProperty(
+        name="Color",
+        subtype="COLOR",
+        default=(1, 0, 0),
+        min=0.0,
+        max=1.0,
+        # update=update_task_animation_color,
+    )
+
+
+class BIMAnimationProperties(PropertyGroup):
+    is_editing: BoolProperty(name="Is Loaded", default=False)
+    active_color_component_outputs_index: IntProperty(name="Active Color Component Index")
+    active_color_component_inputs_index: IntProperty(name="Active Color Component Index")
+    task_colors_components_inputs: CollectionProperty(name="Groups", type=BIMTaskTypeColor)
+    task_colors_components_outputs: CollectionProperty(name="Groups", type=BIMTaskTypeColor)
+    color_full: FloatVectorProperty(
+        name="Full Bar",
+        subtype="COLOR",
+        default=(1.0, 0.0, 0.0),
+        min=0.0,
+        max=1.0,
+        description="color picker",
+        update=update_color_full,
+    )
+    color_progress: FloatVectorProperty(
+        name="Progress Bar",
+        subtype="COLOR",
+        default=(0.0, 1.0, 0.0),
+        min=0.0,
+        max=1.0,
+        description="color picker",
+        update=update_color_progress,
+    )

src/blenderbim/blenderbim/bim/module/sequence/ui.py

@@ -123,6 +123,7 @@ class BIM_PT_work_schedules(Panel):
             SequenceData.load()
         self.props = context.scene.BIMWorkScheduleProperties
         self.tprops = context.scene.BIMTaskTreeProperties
+        self.animation_props = context.scene.BIMAnimationProperties
 
         row = self.layout.row()
         if SequenceData.data["has_work_schedules"]:
@@ -185,6 +186,7 @@ class BIM_PT_work_schedules(Panel):
                     row.operator("bim.edit_task", text="", icon="CHECKMARK")
                 row.operator("bim.disable_editing_task", text="", icon="CANCEL")
             else:
+                row.prop(self.props, "should_show_bar_visual_option", text="", icon="NLA_PUSHDOWN")
                 row.operator("bim.enable_editing_task_sequence", text="", icon="TRACKING").task = ifc_definition_id
                 row.operator("bim.enable_editing_task_time", text="", icon="TIME").task = ifc_definition_id
                 row.operator("bim.enable_editing_task_calendar", text="", icon="VIEW_ORTHO").task = ifc_definition_id
@@ -220,6 +222,8 @@ class BIM_PT_work_schedules(Panel):
         self.layout.template_list("BIM_UL_task_columns", "", self.props, "columns", self.props, "active_column_index")
 
     def draw_visualisation_ui(self):
+        row = self.layout.row(align=True)
+        row.label(text="Start Date/ Date Range:")
         row = self.layout.row(align=True)
         op = row.operator("bim.datepicker", text=self.props.visualisation_start or "Start Date", icon="REW")
         op.target_prop = "BIMWorkScheduleProperties.visualisation_start"
@@ -227,11 +231,9 @@ class BIM_PT_work_schedules(Panel):
         op.target_prop = "BIMWorkScheduleProperties.visualisation_finish"
         op = row.operator("bim.guess_date_range", text="Guess", icon="FILE_REFRESH")
         op.work_schedule = self.props.active_work_schedule_id
-        op = row.operator("bim.visualise_work_schedule_date", text="", icon="RESTRICT_RENDER_OFF")
-        op.work_schedule = self.props.active_work_schedule_id
-        op = row.operator("bim.visualise_work_schedule_date_range", text="", icon="OUTLINER_OB_CAMERA")
-        op.work_schedule = self.props.active_work_schedule_id
 
+        row = self.layout.row(align=True)
+        row.label(text="Animation Options")
         row = self.layout.row(align=True)
         row.prop(self.props, "speed_types", text="")
         if self.props.speed_types == "FRAME_SPEED":
@@ -242,6 +244,50 @@ class BIM_PT_work_schedules(Panel):
             row.prop(self.props, "speed_real_duration", text="")
         elif self.props.speed_types == "MULTIPLIER_SPEED":
             row.prop(self.props, "speed_multiplier", text="")
+        if not self.animation_props.is_editing:
+            op = row.operator(
+                "bim.enable_editing_task_animation_colors", text="Customize Animation Colors", icon="SEQUENCE_COLOR_04"
+            )
+        else:
+            op = row.operator(
+                "bim.disable_editing_task_animation_colors", text="Hide Animation Colors", icon="SEQUENCE_COLOR_01"
+            )
+
+        if self.animation_props.is_editing:
+            self.draw_visualisation_settings_ui()
+
+        row = self.layout.row()
+        op = row.operator("bim.visualise_work_schedule_date_range", text="Create Animation", icon="OUTLINER_OB_CAMERA")
+        op.work_schedule = self.props.active_work_schedule_id
+        op = row.operator("bim.visualise_work_schedule_date", text="Create SnapShot", icon="RESTRICT_RENDER_OFF")
+        op.work_schedule = self.props.active_work_schedule_id
+
+    def draw_visualisation_settings_ui(self):
+        grid = self.layout.grid_flow(columns=2, even_columns=True)
+        col = grid.column()
+        row1 = col.row(align=True)
+        row1.label(text="INPUT COLORS", icon="COLLECTION_COLOR_01")
+        row1 = col.row()
+        row1.template_list(
+            "BIM_UL_animation_colors",
+            "",
+            self.animation_props,
+            "task_colors_components_inputs",
+            self.animation_props,
+            "active_color_component_inputs_index",
+        )
+        col = grid.column()
+        row1 = col.row(align=True)
+        row1.label(text="OUTPUT COLORS", icon="COLLECTION_COLOR_04")
+        row1 = col.row()
+        row1.template_list(
+            "BIM_UL_animation_colors",
+            "",
+            self.animation_props,
+            "task_colors_components_outputs",
+            self.animation_props,
+            "active_color_component_outputs_index",
+        )
 
     def draw_editable_work_schedule_ui(self):
         draw_attributes(self.props.work_schedule_attributes, self.layout)
@@ -375,6 +421,7 @@ class BIM_PT_task_icom(Panel):
         row2 = col.row(align=True)
         total_task_inputs = len(self.props.task_inputs)
         row2.label(text="Inputs ({})".format(total_task_inputs))
+
         if context.selected_objects:
             op = row2.operator("bim.assign_process", icon="ADD", text="")
             op.task = task.ifc_definition_id
@@ -431,6 +478,7 @@ class BIM_PT_task_icom(Panel):
         row2 = col.row(align=True)
         total_task_outputs = len(self.props.task_outputs)
         row2.label(text="Outputs ({})".format(total_task_outputs))
+
         if context.selected_objects:
             op = row2.operator("bim.assign_product", icon="ADD", text="")
             op.task = task.ifc_definition_id
@@ -450,6 +498,7 @@ class BIM_PT_task_icom(Panel):
             "BIM_UL_task_outputs", "", self.props, "task_outputs", self.props, "active_task_output_index"
         )
 
+
 class BIM_UL_task_columns(UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
         props = context.scene.BIMWorkScheduleProperties
@@ -477,6 +526,14 @@ class BIM_UL_task_resources(UIList):
             row.prop(item, "schedule_usage", emboss=False, text="")
 
 
+class BIM_UL_animation_colors(UIList):
+    def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
+        if item:
+            row = layout.row()
+            row.prop(item, "color", text="")
+            row.label(text=item.name)
+
+
 class BIM_UL_task_outputs(UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
         if item:
@@ -508,7 +565,14 @@ class BIM_UL_tasks(UIList):
                     text="",
                     emboss=False,
                 )
-
+            if self.props.should_show_bar_visual_option:
+                row.prop(
+                    item,
+                    "has_bar_visual",
+                    icon="COLLECTION_COLOR_04" if item.has_bar_visual else "OUTLINER_COLLECTION",
+                    text="",
+                    emboss=False,
+                )
             if self.props.active_task_id:
                 if self.props.editing_task_type == "SEQUENCE" and self.props.active_task_id != item.ifc_definition_id:
                     if item.is_predecessor:
@@ -733,9 +797,34 @@ class BIM_PT_work_calendars(Panel):
         draw_attributes(self.props.work_calendar_attributes, self.layout)
 
 
-class BIM_PT_SequenceToolKit(Panel):
-    bl_label = "Sequence Toolkit"
-    bl_idname = "BIM_PT_Sequence_toolkit"
+class BIM_PT_Task_Tools(Panel):
+    bl_label = "Task Bar Creator"
+    bl_idname = "BIM_PT_Task_Bar_Creator"
+    bl_space_type = "VIEW_3D"
+    bl_region_type = "UI"
+    bl_category = "Sequence Toolkit"
+
+    def draw(self, context):
+        self.animation_props = context.scene.BIMAnimationProperties
+        row = self.layout.row()
+        row.operator("bim.add_task_bars", text="Add Bar Visual", icon="NLA_PUSHDOWN")
+
+        grid = self.layout.grid_flow(columns=2, even_columns=True)
+        # Column1
+        col = grid.column()
+        row1 = col.row(align=True)
+        row1.label(text="Bar Colors", icon="NLA_PUSHDOWN")
+
+        row2 = col.row(align=True)
+        row2.prop(self.animation_props, "color_progress")
+
+        row3 = col.row(align=True)
+        row3.prop(self.animation_props, "color_full")
+
+
+class BIM_PT_Task_Bar_Creator(Panel):
+    bl_label = "Task Tools"
+    bl_idname = "BIM_PT_Task_Tools"
     bl_space_type = "VIEW_3D"
     bl_region_type = "UI"
     bl_category = "Sequence Toolkit"
@@ -743,7 +832,7 @@ class BIM_PT_SequenceToolKit(Panel):
     def draw(self, context):
         row = self.layout.row()
         row.operator(
-            "bim.highlight_product_related_task", text="Go to Input-related Task ", icon="STYLUS_PRESSURE"
+            "bim.highlight_product_related_task", text="Find Input-related Task ", icon="STYLUS_PRESSURE"
         ).product_type = "Input"
         row = self.layout.row()
         row.operator(

src/blenderbim/blenderbim/core/sequence.py

@@ -478,3 +478,26 @@ def guess_date_range(sequence, work_schedule=None):
 
 def setup_default_task_columns(sequence):
     sequence.setup_default_task_columns()
+
+
+def add_task_bars(sequence):
+    tasks = sequence.get_animation_bar_tasks()
+    if tasks:
+        sequence.create_bars(tasks)
+
+
+def enable_editing_task_animation_colors(sequence):
+    sequence.load_task_animation_colors()
+    sequence.enable_editing_task_animation_colors()
+
+
+def disable_editing_task_animation_colors(sequence):
+    sequence.disable_editing_task_animation_colors()
+
+
+def visualise_work_schedule_date_range(sequence, work_schedule=None):
+    settings = sequence.get_animation_settings()
+    product_frames = sequence.get_animation_product_frames(work_schedule, settings)
+    sequence.load_task_animation_colors()
+    sequence.animate_objects(settings, product_frames)
+    sequence.add_text_animation_handler(settings)

src/blenderbim/blenderbim/tool/sequence.py

@@ -27,9 +27,9 @@ import blenderbim.core.tool
 import blenderbim.tool as tool
 import blenderbim.bim.helper
 import blenderbim.bim.module.sequence.helper as helper
-
 from dateutil import parser
 from datetime import datetime
+import mathutils
 
 
 class Sequence(blenderbim.core.tool.Sequence):
@@ -131,16 +131,18 @@ class Sequence(blenderbim.core.tool.Sequence):
         props = bpy.context.scene.BIMWorkScheduleProperties
         cls.contracted_tasks = json.loads(props.contracted_tasks)
 
-        related_objects_ids = helper.get_root_tasks_ids(work_schedule)
-        if not related_objects_ids:
-            return
-        cls.sort_keys = {i: cls.get_sort_key(tool.Ifc.get().by_id(i)) for i in related_objects_ids}
-        related_objects_ids = sorted(cls.sort_keys, key=cls.natural_sort_key)
-        if props.is_sort_reversed:
-            related_objects_ids.reverse()
+        related_objects_ids = cls.get_sorted_tasks_ids(ifcopenshell.util.sequence.get_root_tasks(work_schedule))
         for related_object_id in related_objects_ids:
             cls.create_new_task_li(related_object_id, 0)
 
+    @classmethod
+    def get_sorted_tasks_ids(cls, tasks):
+        cls.sort_keys = {task.id(): cls.get_sort_key(task) for task in tasks}
+        related_object_ids = sorted(cls.sort_keys, key=cls.natural_sort_key)
+        if bpy.context.scene.BIMWorkScheduleProperties.is_sort_reversed:
+            return related_object_ids.reverse()
+        return related_object_ids
+
     @classmethod
     def create_new_task_li(cls, related_object_id, level_index):
         task = tool.Ifc.get().by_id(related_object_id)
@@ -151,11 +153,7 @@ class Sequence(blenderbim.core.tool.Sequence):
         if task.IsNestedBy:
             new.has_children = True
             if new.is_expanded:
-                cls.sort_keys = {subtask.id(): cls.get_sort_key(subtask) for subtask in helper.get_nested_tasks(task)}
-                related_object_ids = sorted(cls.sort_keys, key=cls.natural_sort_key)
-                if bpy.context.scene.BIMWorkScheduleProperties.is_sort_reversed:
-                    related_object_ids.reverse()
-                for related_object_id in related_object_ids:
+                for related_object_id in cls.get_sorted_tasks_ids(ifcopenshell.util.sequence.get_nested_tasks(task)):
                     cls.create_new_task_li(related_object_id, level_index + 1)
 
     @classmethod
@@ -226,8 +224,8 @@ class Sequence(blenderbim.core.tool.Sequence):
                     else "-"
                 )
             else:
-                derived_start = helper.derive_date(task, "ScheduleStart", is_earliest=True)
-                derived_finish = helper.derive_date(task, "ScheduleFinish", is_latest=True)
+                derived_start = ifcopenshell.util.sequence.derive_date(task, "ScheduleStart", is_earliest=True)
+                derived_finish = ifcopenshell.util.sequence.derive_date(task, "ScheduleFinish", is_latest=True)
                 item.derived_start = canonicalise_time(derived_start) if derived_start else ""
                 item.derived_finish = canonicalise_time(derived_finish) if derived_finish else ""
                 if derived_start and derived_finish and calendar:
@@ -347,22 +345,25 @@ class Sequence(blenderbim.core.tool.Sequence):
     def load_task_time_attributes(cls, task_time):
         def callback(name, prop, data):
             if prop.data_type == "string":
-                if name == "ScheduleDuration" and data[name] and isinstance(data[name], str):
+                duration_props = bpy.context.scene.BIMWorkScheduleProperties.durations_attributes.add()
+                duration_props.name = name
+                if prop.is_null:
+                    for key in duration_props.keys():
+                        if key != "name":
+                            setattr(duration_props, key, 0)
+                    return True
+                if name in ["ScheduleDuration", "ActualDuration", "FreeFloat", "TotalFloat"] and data[name]:
                     time_object = ifcopenshell.util.date.ifc2datetime(data[name])
-                    minutes = int(round(time_object.seconds / 60 % 60))
-                    hours = (time_object.seconds - minutes * 60) / 60 / 60
-                    bpy.context.scene.BIMDuration.duration_days = int(time_object.days)
-                    bpy.context.scene.BIMDuration.duration_hours = round(hours)
-                    bpy.context.scene.BIMDuration.duration_minutes = (
-                        minutes  # should consider years, months and seconds.
-                    )
-                    return True
-                if isinstance(data[name], datetime):
-                    prop.string_value = "" if prop.is_null else data[name].isoformat()
+                    for key, value in helper.parse_duration_as_blender_props(time_object).items():
+                        duration_props[key] = value
                     return True
+            if isinstance(data[name], datetime):
+                prop.string_value = "" if prop.is_null else data[name].isoformat()
+                return True
 
         props = bpy.context.scene.BIMWorkScheduleProperties
         props.task_time_attributes.clear()
+        props.durations_attributes.clear()
         blenderbim.bim.helper.import_attributes2(task_time, props.task_time_attributes, callback)
 
     @classmethod
@@ -380,26 +381,29 @@ class Sequence(blenderbim.core.tool.Sequence):
     @classmethod
     def get_task_time_attributes(cls):
         def callback(attributes, prop):
+
             if "Start" in prop.name or "Finish" in prop.name or prop.name == "StatusTime":
                 if prop.is_null:
                     attributes[prop.name] = None
                     return True
                 attributes[prop.name] = helper.parse_datetime(prop.string_value)
                 return True
-            elif prop.name == "ScheduleDuration":
+            elif prop.name in ["ScheduleDuration", "ActualDuration", "FreeFloat", "TotalFloat"]:
+                props = bpy.context.scene.BIMWorkScheduleProperties
                 if prop.is_null:
+                    attributes[prop.name] = None
+                    for value in props.durations_attributes.values():
+                        value = 0
+                    return True
+                else:
+                    duration_type = getattr(attributes, "DurationType", None)
+                    time_split_iso_duration = helper.simplify_duration(
+                        props.durations_attributes, duration_type, prop.name
+                    )
+                    attributes[prop.name] = time_split_iso_duration
+                    for value in props.durations_attributes.values():
+                        value = 0
                     return True
-                # TODO make this parse PT32 as P4D
-                attributes[prop.name] = helper.parse_duration(prop.string_value)
-                dprops = bpy.context.scene.BIMDuration
-                duration_days = dprops.duration_days if dprops.duration_days else 0
-                duration_hours = dprops.duration_hours if dprops.duration_hours else 0
-                duration_minutes = dprops.duration_minutes if dprops.duration_minutes else 0
-                dprops.duration_days = 0
-                dprops.duration_hours = 0
-                dprops.duration_minutes = 0
-                attributes[prop.name] = helper.parse_duration(f"P{duration_days}DT{duration_hours}H{duration_minutes}M")
-                return True
 
         props = bpy.context.scene.BIMWorkScheduleProperties
         return blenderbim.bim.helper.export_attributes(props.task_time_attributes, callback)
@@ -455,16 +459,16 @@ class Sequence(blenderbim.core.tool.Sequence):
 
     @classmethod
     def get_direct_nested_tasks(cls, task):
-        return helper.get_nested_tasks(task)
+        return ifcopenshell.util.sequence.get_nested_tasks(task)
 
     @classmethod
     def get_direct_task_outputs(cls, task):
-        return helper.get_direct_task_outputs(task)
+        return ifcopenshell.util.sequence.get_direct_task_outputs(task)
 
     @classmethod
     def get_task_outputs(cls, task):
         is_deep = bpy.context.scene.BIMWorkScheduleProperties.is_nested_task_outputs
-        return helper.get_task_outputs(task, is_deep)
+        return ifcopenshell.util.sequence.get_task_outputs(task, is_deep)
 
     @classmethod
     def get_task_resources(cls, task):
@@ -786,7 +790,7 @@ class Sequence(blenderbim.core.tool.Sequence):
 
     @classmethod
     def guess_date_range(cls, work_schedule):
-        return helper.guess_date_range(work_schedule)
+        return ifcopenshell.util.sequence.guess_date_range(work_schedule)
 
     @classmethod
     def update_visualisation_date(cls, start_date, finish_date):
@@ -795,8 +799,474 @@ class Sequence(blenderbim.core.tool.Sequence):
                 return "-"
             return time.strftime("%d/%m/%y")
 
-        print(start_date, finish_date)
-
         props = bpy.context.scene.BIMWorkScheduleProperties
         props.visualisation_start = canonicalise_time(start_date)
         props.visualisation_finish = canonicalise_time(finish_date)
+
+    @classmethod
+    def get_animation_bar_tasks(cls):
+        return [
+            tool.Ifc.get().by_id(item.ifc_definition_id)
+            for item in bpy.context.scene.BIMTaskTreeProperties.tasks
+            if item.has_bar_visual
+        ] or []
+
+    @classmethod
+    def create_bars(cls, tasks):
+        def set_material(name, r, g, b):
+            material = bpy.data.materials.new(name)
+            material.use_nodes = True
+            material.node_tree.nodes["Principled BSDF"].inputs[0].default_value = (r, g, b, 1.0)
+            return material
+
+        def get_animation_materials():
+            if "color_progress" in bpy.data.materials:
+                material_progress = bpy.data.materials["color_progress"]
+            else:
+                material_progress = set_material("color_progress", 0.0, 1.0, 0.0)
+            if "color_full" in bpy.data.materials:
+                material_full = bpy.data.materials["color_full"]
+            else:
+                material_full = set_material("color_full", 1.0, 0.0, 0.0)
+            return material_progress, material_full
+
+        vertical_spacing = 0.5
+        size_ratio = 1 / 20
+        collection = bpy.data.collections.new("Bar Visual")
+        bpy.context.scene.collection.children.link(collection)
+
+        lead_bar_thickness = 0.2
+        size = 1.0
+
+        def create_task_bar_data(tasks, vertical_spacing):
+            props = bpy.context.scene.BIMWorkScheduleProperties
+            viz_start = (
+                parser.parse(props.visualisation_start, dayfirst=True, fuzzy=True)
+                if props.visualisation_start
+                else None
+            )
+            viz_finish = parser.parse(props.visualisation_finish, dayfirst=True, fuzzy=True)
+
+            start_frame = bpy.context.scene.frame_start
+            end_frame = bpy.context.scene.frame_end
+            total_frames = end_frame - start_frame
+            task_data = []
+
+            material_progress, material_full = get_animation_materials()
+            for task in tasks:
+                task_start_date = ifcopenshell.util.sequence.derive_date(task, "ScheduleStart", is_earliest=True)
+                finish_date = ifcopenshell.util.sequence.derive_date(task, "ScheduleFinish", is_latest=True)
+                if task_start_date and finish_date:
+                    duration = viz_finish - viz_start
+                    task_start_frame = round(start_frame + (((task_start_date - viz_start) / duration) * total_frames))
+                    task_finish_frame = round(start_frame + (((finish_date - viz_start) / duration) * total_frames))
+                    data = {
+                        "Name": task.Name if task.Name else "Unnamed",
+                        "StartDate": task_start_date,
+                        "FinishDate": finish_date,
+                        "Start_frame": task_start_frame,
+                        "Finish_frame": task_finish_frame,
+                        "bar": None,
+                    }
+                    bar = add_bar(
+                        size=1, material=material_progress, vertical_spacing=vertical_spacing, task=data, animate=True
+                    )
+                    color_progress = bpy.context.scene.BIMAnimationProperties.color_progress
+                    bar.color = (color_progress.r, color_progress.g, color_progress.b, 1.0)
+
+                    bar2 = add_bar(
+                        size=1, material=material_full, vertical_spacing=vertical_spacing, task=data, animate=False
+                    )
+                    color_full = bpy.context.scene.BIMAnimationProperties.color_full
+                    bar2.color = (color_full.r, color_full.g, color_full.b, 1.0)
+
+                    bar_size = (data["Finish_frame"] - data["Start_frame"]) * size_ratio
+                    bar2.scale = (lead_bar_thickness, bar_size, 1)
+
+                    shift_object(bar2, x=-((size + lead_bar_thickness) / 2))
+
+                    start_text = add_text(
+                        data["StartDate"].strftime("%d/%m/%y"), 0, "RIGHT", vertical_spacing, collection
+                    )
+
+                    add_text(data["Name"], 0, "LEFT", vertical_spacing, collection)
+
+                    finish_text = add_text(
+                        data["FinishDate"].strftime("%d/%m/%y"), bar_size, "LEFT", vertical_spacing, collection
+                    )
+
+                    shift_object(start_text, y=-(size + lead_bar_thickness))
+
+                    shift_object(finish_text, y=-(size + lead_bar_thickness))
+
+                    vertical_spacing += 5
+                    collection.objects.link(bar)
+                    collection.objects.link(bar2)
+
+            return
+
+        def animate_bar(bar, task):
+            scale = (1, size_ratio, 1)
+            bar.scale = scale
+            bar.keyframe_insert(data_path="scale", frame=task["Start_frame"])
+            scale2 = (1, (task["Finish_frame"] - task["Start_frame"]) * size_ratio, 1)
+            bar.scale = scale2
+            bar.keyframe_insert(data_path="scale", frame=task["Finish_frame"])
+
+        def place_bar(bar, vertical_spacing):
+            for vertex in bar.data.vertices:
+                vertex.co[1] += 0.5
+            bpy.ops.transform.rotate(value=1.5708, orient_axis="Z")
+            bpy.ops.transform.translate(value=(0, -vertical_spacing, 0), orient_type="GLOBAL")
+
+        def shift_object(obj, x=0.0, y=0.0, z=0.0):
+            vec = mathutils.Vector((x, y, z))
+            inv = obj.matrix_world.copy()
+            inv.invert()
+            vec_rot = vec @ inv
+            obj.location = obj.location + vec_rot
+
+        def add_text(text, x_position, align, vertical_spacing, collection=None):
+            bpy.ops.object.text_add()
+            bpy.context.object.data.align_x = align
+            bpy.context.object.data.align_y = "CENTER"
+            bpy.ops.transform.translate(value=(x_position, -(vertical_spacing - 1), 0), orient_type="GLOBAL")
+            bpy.context.object.data.body = text
+            if collection:
+                collection.objects.link(bpy.context.object)
+            return bpy.context.object
+
+        def add_bar(size, material, vertical_spacing, task=None, animate=False):
+            bpy.ops.mesh.primitive_plane_add(size=size)
+            bpy.context.object.data.materials.append(material)
+            place_bar(bpy.context.object, vertical_spacing)
+            if task and animate:
+                animate_bar(bpy.context.object, task)
+            return bpy.context.object
+
+        if tasks:
+            data = create_task_bar_data(tasks, vertical_spacing)
+
+    @classmethod
+    def enable_editing_task_animation_colors(cls):
+        bpy.context.scene.BIMAnimationProperties.is_editing = True
+
+    @classmethod
+    def load_task_animation_colors(cls):
+        props = bpy.context.scene.BIMAnimationProperties
+        if not props.task_colors_components_inputs:
+            if tool.Ifc.schema():
+                # for attribute in tool.Ifc.schema().declaration_by_name("IfcTask").all_attributes():
+                #     if attribute.name() != "PredefinedType":
+                #         continue
+                #     task_types = ifcopenshell.util.attribute.get_enum_items(attribute)
+                # return [(e, e, "") for e in enum_items]
+                groups = {
+                    "CREATION": {
+                        "PredefinedType": ["CONSTRUCTION", "INSTALLATION"],
+                        "Color": (0.0, 1.0, 0.0),
+                    },
+                    "DESTRUCTION": {
+                        "PredefinedType": ["DEMOLITION", "DISMANTLE", "DISPOSAL", "REMOVAL"],
+                        "Color": (1.0, 0.0, 0.0),
+                    },
+                    "MOVEMENT_FROM": {
+                        "PredefinedType": ["LOGISTIC", "MOVE"],
+                        "Color": (1.0, 0.5, 0.0),
+                    },
+                    "MOVEMENT_TO": {
+                        "PredefinedType": ["LOGISTIC", "MOVE"],
+                        "Color": (1.0, 1.0, 0.0),
+                    },
+                    "OPERATION": {
+                        "PredefinedType": ["ATTENDANCE", "MAINTENANCE", "OPERATION", "RENOVATION"],
+                        "Color": (0.0, 0.0, 1.0),
+                    },
+                    "USERDEFINED": {
+                        "PredefinedType": ["USERDEFINED", "NOTDEFINED"],
+                        "Color": (0.2, 0.2, 0.2),
+                    },
+                }
+                for group, data in groups.items():
+                    for predefined_type in data["PredefinedType"]:
+                        if group in ["CREATION", "OPERATION", "MOVEMENT_TO"]:
+                            predefined_type_item = props.task_colors_components_outputs.add()
+                        elif group in ["MOVEMENT_FROM", "DESTRUCTION"]:
+                            predefined_type_item = props.task_colors_components_inputs.add()
+                        else:
+                            predefined_type_item = props.task_colors_components_outputs.add()
+                        predefined_type_item.name = predefined_type
+                        predefined_type_item.color = data["Color"]
+
+    @classmethod
+    def disable_editing_task_animation_colors(cls):
+        bpy.context.scene.BIMAnimationProperties.is_editing = False
+
+    @classmethod
+    def get_animation_settings(cls):
+        def calculate_total_frames(fps):
+            if props.speed_types == "FRAME_SPEED":
+                return calculate_using_frames(
+                    start,
+                    finish,
+                    props.speed_animation_frames,
+                    isodate.parse_duration(props.speed_real_duration),
+                )
+            elif props.speed_types == "DURATION_SPEED":
+                return calculate_using_duration(
+                    start,
+                    finish,
+                    fps,
+                    isodate.parse_duration(props.speed_animation_duration),
+                    isodate.parse_duration(props.speed_real_duration),
+                )
+            elif props.speed_types == "MULTIPLIER_SPEED":
+                return calculate_using_multiplier(
+                    start,
+                    finish,
+                    fps,
+                    props.speed_multiplier,
+                )
+
+        def calculate_using_multiplier(start, finish, fps, multiplier):
+            animation_time = (finish - start) / multiplier
+            return animation_time.seconds_left() * fps
+
+        def calculate_using_duration(start, finish, fps, animation_duration, real_duration):
+            return calculate_using_multiplier(start, finish, fps, real_duration / animation_duration)
+
+        def calculate_using_frames(start, finish, animation_frames, real_duration):
+            return ((finish - start) / real_duration) * animation_frames
+
+        props = bpy.context.scene.BIMWorkScheduleProperties
+        start = parser.parse(props.visualisation_start, dayfirst=True, fuzzy=True)
+        finish = parser.parse(props.visualisation_finish, dayfirst=True, fuzzy=True)
+        duration = finish - start
+        start_frame = 1
+        total_frames = calculate_total_frames(bpy.context.scene.render.fps)
+        return {
+            "start": start,
+            "finish": finish,
+            "duration": duration,
+            "start_frame": start_frame,
+            "total_frames": total_frames,
+        }
+
+    @classmethod
+    def get_animation_product_frames(cls, work_schedule, settings):
+        def preprocess_task(task):
+            for subtask in ifcopenshell.util.sequence.get_nested_tasks(task):
+                preprocess_task(subtask)
+            start = ifcopenshell.util.sequence.derive_date(task, "ScheduleStart", is_earliest=True)
+            finish = ifcopenshell.util.sequence.derive_date(task, "ScheduleFinish", is_latest=True)
+            if not start or not finish:
+                return
+            for output in ifcopenshell.util.sequence.get_task_outputs(task):
+                add_product_frame(output.id(), task.PredefinedType, start, finish, "output")
+            for input in cls.get_task_inputs(task):
+                add_product_frame(input.id(), task.PredefinedType, start, finish, "input")
+
+        def add_product_frame(product_id, type, product_start, product_finish, relationship):
+            product_frames.setdefault(product_id, []).append(
+                {
+                    "type": type,
+                    "relationship": relationship,
+                    "STARTED": round(
+                        settings["start_frame"]
+                        + (((product_start - settings["start"]) / settings["duration"]) * settings["total_frames"])
+                    ),
+                    "COMPLETED": round(
+                        settings["start_frame"]
+                        + (((product_finish - settings["start"]) / settings["duration"]) * settings["total_frames"])
+                    ),
+                }
+            )
+
+        product_frames = {}
+        for root_task in ifcopenshell.util.sequence.get_root_tasks(work_schedule):
+            preprocess_task(root_task)
+        return product_frames
+
+    @classmethod
+    def animate_objects(cls, settings, frames):
+        for obj in bpy.data.objects:
+            if not obj.BIMObjectProperties.ifc_definition_id:
+                continue
+            if obj.animation_data:
+                obj.animation_data_clear()
+            cls.earliest_frame = None
+            product_frames = frames.get(obj.BIMObjectProperties.ifc_definition_id, [])
+            for product_frame in product_frames:
+                if product_frame["relationship"] == "input":
+                    cls.animate_input(obj, settings["start_frame"], product_frame)
+                elif product_frame["relationship"] == "output":
+                    cls.animate_output(obj, settings["start_frame"], product_frame)
+        area = next(area for area in bpy.context.screen.areas if area.type == "VIEW_3D")
+        area.spaces[0].shading.color_type = "OBJECT"
+        bpy.context.scene.frame_start = settings["start_frame"]
+        bpy.context.scene.frame_end = int(settings["start_frame"] + settings["total_frames"])
+
+    @classmethod
+    def animate_input(cls, obj, start_frame, product_frame):
+        props = bpy.context.scene.BIMAnimationProperties
+        color = props.task_colors_components_inputs[product_frame["type"]].color
+        if product_frame["type"] in ["LOGISTIC", "MOVE"]:
+            cls.animate_movement_from(obj, start_frame, product_frame, color)
+        elif product_frame["type"] in ["DEMOLITION", "DISMANTLE", "DISPOSAL", "REMOVAL"]:
+            cls.animate_destruction(obj, start_frame, product_frame, color)
+        else:
+            cls.animate_consumption(obj, start_frame, product_frame, color)
+
+    @classmethod
+    def animate_output(cls, obj, start_frame, product_frame):
+        props = bpy.context.scene.BIMAnimationProperties
+        color = props.task_colors_components_outputs[product_frame["type"]].color
+        if product_frame["type"] in ["CONSTRUCTION", "INSTALLATION", "NOTDEFINED"]:
+            cls.animate_creation(obj, start_frame, product_frame, color)
+        elif product_frame["type"] in ["ATTENDANCE", "MAINTENANCE", "OPERATION", "RENOVATION"]:
+            cls.animate_operation(obj, start_frame, product_frame, color)
+        elif product_frame["type"] in ["LOGISTIC", "MOVE"]:
+            cls.animate_movement_to(obj, product_frame, color)
+        else:
+            cls.animate_operation(obj, start_frame, product_frame, color)
+
+    @classmethod
+    def animate_destruction(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.color = (1.0, 1.0, 1.0, 1)
+            obj.hide_viewport = False
+            obj.hide_render = False
+            obj.keyframe_insert(data_path="color", frame=start_frame)
+            obj.keyframe_insert(data_path="hide_viewport", frame=start_frame)
+            obj.keyframe_insert(data_path="hide_render", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.hide_viewport = True
+        obj.hide_render = True
+        obj.color = (0.0, 0.0, 0.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def animate_movement_from(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.color = (1.0, 1.0, 1.0, 1)
+            obj.keyframe_insert(data_path="color", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.hide_viewport = False
+        obj.hide_render = False
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"] - 1)
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"] - 1)
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.hide_viewport = True
+        obj.hide_render = True
+        obj.color = (0.0, 0.0, 0.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def animate_consumption(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.color = (1.0, 1.0, 1.0, 1)
+            obj.keyframe_insert(data_path="color", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.hide_viewport = False
+        obj.hide_render = False
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"] - 1)
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"] - 1)
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.hide_viewport = True
+        obj.hide_render = True
+        obj.color = (0.0, 0.0, 0.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["COMPLETED"])
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def animate_creation(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.hide_viewport = True
+            obj.hide_render = True
+            obj.keyframe_insert(data_path="hide_viewport", frame=start_frame)
+            obj.keyframe_insert(data_path="hide_render", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.hide_viewport = False
+        obj.hide_render = False
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"])
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"])
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.color = (1.0, 1.0, 1.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def animate_operation(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.color = (1.0, 1.0, 1.0, 1)
+            obj.keyframe_insert(data_path="color", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"] - 1)
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.color = (1.0, 1.0, 1.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def animate_movement_to(cls, obj, start_frame, product_frame, color):
+        if cls.earliest_frame is None or product_frame["STARTED"] < cls.earliest_frame:
+            obj.hide_viewport = True
+            obj.hide_render = True
+            obj.keyframe_insert(data_path="hide_viewport", frame=start_frame)
+            obj.keyframe_insert(data_path="hide_render", frame=start_frame)
+            cls.earliest_frame = product_frame["STARTED"]
+        obj.hide_viewport = False
+        obj.hide_render = False
+        obj.color = (color.r, color.g, color.b, 1)
+        obj.keyframe_insert(data_path="hide_viewport", frame=product_frame["STARTED"])
+        obj.keyframe_insert(data_path="hide_render", frame=product_frame["STARTED"])
+        obj.keyframe_insert(data_path="color", frame=product_frame["STARTED"])
+        obj.color = (1.0, 1.0, 1.0, 1)
+        obj.keyframe_insert(data_path="color", frame=product_frame["COMPLETED"])
+
+    @classmethod
+    def add_text_animation_handler(cls, settings):
+        def remove_handler(function):
+            bpy.app.handlers.frame_change_post.remove(function)
+
+        def append_handler(function):
+            bpy.app.handlers.frame_change_post.append(function)
+
+        def animate_text_handler(scene):
+            data = bpy.data.curves.get("Timeline")
+            if not data or not bpy.data.objects.get("Timeline"):
+                remove_handler(animate_text_handler)
+            data.body = get_frame_date(scene, data.BIMDateTextProperties)
+
+        def get_frame_date(scene, props):
+            start = parser.parse(props.start, dayfirst=True, fuzzy=True)
+            finish = parser.parse(props.finish, dayfirst=True, fuzzy=True)
+            duration = finish - start
+            frame_date = (((scene.frame_current - props.start_frame) / props.total_frames) * duration) + start
+            return frame_date.date().isoformat()
+
+        data = bpy.data.curves.get("Timeline")
+        if not data:
+            data = bpy.data.curves.new(type="FONT", name="Timeline")
+        obj = bpy.data.objects.get("Timeline")
+        if not obj:
+            obj = bpy.data.objects.new(name="Timeline", object_data=data)
+            bpy.context.scene.collection.objects.link(obj)
+
+        obj.data.BIMDateTextProperties.start_frame = settings["start_frame"]
+        obj.data.BIMDateTextProperties.total_frames = int(settings["total_frames"])
+        obj.data.BIMDateTextProperties.start = bpy.context.scene.BIMWorkScheduleProperties.visualisation_start
+        obj.data.BIMDateTextProperties.finish = bpy.context.scene.BIMWorkScheduleProperties.visualisation_finish
+        append_handler(animate_text_handler)

src/ifcopenshell-python/ifcopenshell/util/sequence.py

@@ -21,6 +21,32 @@ import ifcopenshell.util.date
 from functools import lru_cache
 
 
+def derive_date(task, attribute_name, date=None, is_earliest=False, is_latest=False):
+    if task.TaskTime:
+        current_date = (
+            ifcopenshell.util.date.ifc2datetime(getattr(task.TaskTime, attribute_name))
+            if getattr(task.TaskTime, attribute_name)
+            else ""
+        )
+        if current_date:
+            return current_date
+    for subtask in get_all_nested_tasks(task):
+        current_date = derive_date(
+            subtask,
+            attribute_name,
+            date=date,
+            is_earliest=is_earliest,
+            is_latest=is_latest,
+        )
+        if is_earliest:
+            if current_date and (date is None or current_date < date):
+                date = current_date
+        if is_latest:
+            if current_date and (date is None or current_date > date):
+                date = current_date
+    return date
+
+
 def derive_calendar(task):
     calendar = [
         rel.RelatingControl
@@ -38,7 +64,7 @@ def count_working_days(start, finish, calendar):
     result = 0
     current_date = datetime.date(start.year, start.month, start.day)
     finish_date = datetime.date(finish.year, finish.month, finish.day)
-    while current_date < finish_date:
+    while current_date <= finish_date:
         if (
             calendar
             and calendar.WorkingTimes
@@ -58,7 +84,11 @@ def get_start_or_finish_date(
         # Typically a milestone will have zero duration, so the start == finish
         return start
     # We minus 1 because the start day itself is counted as a day
-    duration = datetime.timedelta(days=duration.days - 1)
+    months = int(getattr(duration, "months", 0))
+    years = int(getattr(duration, "years", 0))
+    total_duration = duration.days + months * 30 + years * 12 * 30
+    duration = datetime.timedelta(days=total_duration - 1)
+
     if date_type == "START":
         duration = -duration
     result = offset_date(start, duration, duration_type, calendar)
@@ -69,7 +99,10 @@ def get_start_or_finish_date(
 
 def offset_date(start, duration, duration_type, calendar):
     current_date = start
-    abs_duration = abs(duration.days)
+    months = getattr(duration, "months", 0)
+    years = getattr(duration, "years", 0)
+
+    abs_duration = abs((duration.days + months * 30 + years * 12 * 30))
     date_offset = datetime.timedelta(days=1 if duration.days > 0 else -1)
     while abs_duration > 0:
         if duration_type == "ELAPSEDTIME" or not is_calendar_applicable(
@@ -199,3 +232,107 @@ def is_work_time_applicable_to_day(work_time, day):
                 and math.floor(day.day / 7) + 1 == recurrence.Position
             )
         return False  # TODO
+
+
+def get_task_work_schedule(task):
+    parent_task = get_parent_task(task)
+    if parent_task:
+        get_task_work_schedule(parent_task)
+    else:
+        schedules = [
+            rel.RelatingControl
+            for rel in task.HasAssignments
+            if rel.is_a("IfcRelAssignsToControl")
+            and rel.RelatingControl.is_a("IfcWorkSchedule")
+        ]
+        return schedules
+
+
+def get_nested_tasks(task):
+    return [object for rel in task.IsNestedBy for object in rel.RelatedObjects]
+
+
+def get_parent_task(task):
+    return (
+        task.Nests[0].RelatingObject
+        if task.Nests and task.Nests[0].RelatingObject.is_a("IfcTask")
+        else None
+    )
+
+
+def get_all_nested_tasks(task):
+    for nested_task in get_nested_tasks(task):
+        yield nested_task
+        yield from get_all_nested_tasks(nested_task)
+
+
+def get_work_schedule_tasks(work_schedule):
+    tasks = []
+    for root_task in get_root_tasks(work_schedule):
+        nested_tasks = get_all_nested_tasks(root_task)
+        tasks.extend(nested_tasks)
+    return tasks
+
+
+def get_root_tasks(work_schedule):
+    return [
+        obj
+        for rel in work_schedule.Controls
+        for obj in rel.RelatedObjects
+        if obj.is_a("IfcTask")
+    ]
+
+
+def get_root_tasks_ids(work_schedule):
+    return [
+        obj.id()
+        for rel in work_schedule.Controls
+        for obj in rel.RelatedObjects
+        if obj.is_a("IfcTask")
+    ]
+
+
+def guess_date_range(work_schedule):
+    earliest = None
+    latest = None
+    root_tasks = get_root_tasks(work_schedule)
+    tasks_with_assignements = []
+    for task in root_tasks:
+        if has_task_outputs(task):
+            tasks_with_assignements.append(task)
+        for sub_task in get_all_nested_tasks(task):
+            if has_task_outputs(sub_task):
+                tasks_with_assignements.append(sub_task)
+
+    for task in tasks_with_assignements:
+        derived_start = derive_date(task, "ScheduleStart", is_earliest=True)
+        derived_finish = derive_date(task, "ScheduleFinish", is_latest=True)
+        if derived_start and (not earliest or derived_start < earliest):
+            earliest = derived_start
+        if derived_finish and (not latest or derived_finish > latest):
+            latest = derived_finish
+    return earliest, latest
+
+
+def get_direct_task_outputs(task):
+    return [
+        rel.RelatingProduct
+        for rel in task.HasAssignments
+        if rel.is_a("IfcRelAssignsToProduct")
+    ]
+
+
+def get_task_outputs(task, is_deep=False):
+    if not is_deep:
+        return get_direct_task_outputs(task)
+    else:
+        nested_tasks = get_all_nested_tasks(task)
+        return [
+            output
+            for nested_task in nested_tasks
+            for output in get_direct_task_outputs(nested_task)
+        ]
+
+
+def has_task_outputs(task):
+    return len(get_task_outputs(task)) > 0