Users can now specify which IFC files they want to cut

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -116,6 +116,9 @@ if bpy is not None:
         operator.EyedropIfcCsv,
         operator.ReloadIfcFile,
         operator.SelectSimilarType,
+        operator.AddIfcFile,
+        operator.RemoveIfcFile,
+        operator.SelectDocIfcFile,
         prop.StrProperty,
         prop.Classification,
         prop.ClassificationReference,

src/ifcblenderexport/blenderbim/bim/cut_ifc.py

@@ -152,8 +152,6 @@ class IfcCutter:
         self.load_ifc_files()
         print('# Timer logged at {:.2f} seconds'.format(time.time() - start_time))
         start_time = time.time()
-        print('# Get units')
-        self.get_units()
         print('# Timer logged at {:.2f} seconds'.format(time.time() - start_time))
         start_time = time.time()
         print('# Get product shapes')
@@ -189,16 +187,12 @@ class IfcCutter:
         print('# Timer logged at {:.2f} seconds'.format(time.time() - start_time))
 
     def load_ifc_files(self):
-        for filename in Path(self.data_dir).glob('*.ifc'):
-            print('Loading file {} ...'.format(filename))
-            self.ifc_files.append(ifcopenshell.open(filename))
-
-    def get_units(self):
-        unit_assignment = self.ifc_files[0].by_type('IfcUnitAssignment')[0]
-        for unit in unit_assignment.Units:
-            if unit.UnitType == 'LENGTHUNIT':
-                self.unit = unit
-                break
+        loaded_files = []
+        for ifc_file in self.ifc_files:
+            print('Loading file {} ...'.format(ifc_file))
+            if ifc_file:
+                loaded_files.append(ifcopenshell.open(ifc_file))
+        self.ifc_files = loaded_files
 
     def get_product_shapes(self):
         if not self.should_recut:
@@ -699,7 +693,7 @@ class SvgWriter():
 
     def calculate_scale(self):
         # TODO: properly handle units
-        if self.ifc_cutter.unit.Name == 'METRE':
+        if self.ifc_cutter.unit == 'METRE':
             self.scale *= 1000
         self.raw_width = self.ifc_cutter.section_box['x']
         self.raw_height = self.ifc_cutter.section_box['y']

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1572,9 +1572,12 @@ class CutSection(bpy.types.Operator):
         y_axis = camera.matrix_world.to_quaternion() @ Vector((0, -1, 0))
         top_left_corner = location - (width / 2 * x_axis) - (height / 2 * y_axis)
         ifc_cutter = cut_ifc.IfcCutter()
+        ifc_cutter.ifc_files = [i.name for i in bpy.context.scene.DocProperties.ifc_files]
         ifc_cutter.data_dir = bpy.context.scene.BIMProperties.data_dir
         ifc_cutter.diagram_name = self.diagram_name
         ifc_cutter.background_image = bpy.context.scene.render.filepath
+        if bpy.context.scene.unit_settings.length_unit == 'METERS':
+            ifc_cutter.unit = 'METRE'
         ifc_cutter.leader_obj = None
         ifc_cutter.stair_obj = None
         ifc_cutter.dimension_obj = None
@@ -2319,3 +2322,37 @@ class SelectSimilarType(bpy.types.Operator):
             if obj.BIMObjectProperties.relating_type == relating_type:
                 obj.select_set(True)
         return {'FINISHED'}
+
+
+class AddIfcFile(bpy.types.Operator):
+    bl_idname = 'bim.add_ifc_file'
+    bl_label = 'Add IFC File'
+
+    def execute(self, context):
+        pset = bpy.context.scene.DocProperties.ifc_files.add()
+        return {'FINISHED'}
+
+
+class RemoveIfcFile(bpy.types.Operator):
+    bl_idname = 'bim.remove_ifc_file'
+    bl_label = 'Remove IFC File'
+    index: bpy.props.IntProperty()
+
+    def execute(self, context):
+        bpy.context.scene.DocProperties.ifc_files.remove(self.index)
+        return {'FINISHED'}
+
+
+class SelectDocIfcFile(bpy.types.Operator):
+    bl_idname = "bim.select_doc_ifc_file"
+    bl_label = "Select Documentation IFC File"
+    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    index: bpy.props.IntProperty()
+
+    def execute(self, context):
+        bpy.context.scene.DocProperties.ifc_files[self.index].name = self.filepath
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -381,6 +381,7 @@ class DocProperties(PropertyGroup):
     available_views: EnumProperty(items=getViews, name="Available Views")
     sheet_name: StringProperty(name="Sheet Name", update=refreshSheets)
     available_sheets: EnumProperty(items=getSheets, name="Available Sheets")
+    ifc_files: CollectionProperty(name='IFCs', type=StrProperty)
 
 
 class BIMCameraProperties(PropertyGroup):

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -533,11 +533,18 @@ class BIM_PT_documentation(Panel):
         row.operator('bim.open_sheet', icon='URL', text='')
         row.operator('bim.open_compiled_sheet', icon='OUTPUT', text='')
 
-        row = layout.row()
+        row = layout.row(align=True)
         row.operator('bim.add_view_to_sheet')
+        row.operator('bim.create_sheets')
 
         row = layout.row()
-        row.operator('bim.create_sheets')
+        row.operator('bim.add_ifc_file')
+
+        for index, ifc_file in enumerate(props.ifc_files):
+            row = layout.row(align=True)
+            row.prop(ifc_file, 'name', text='IFC #{}'.format(index + 1))
+            row.operator('bim.select_doc_ifc_file', icon='FILE_FOLDER', text='')
+            row.operator('bim.remove_ifc_file', icon='X', text='').index = index
 
         row = layout.row()
         row.operator('bim.generate_digital_twin')