You can now edit structural member axis orientations. Thanks Jesusbill!

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

@@ -34,7 +34,8 @@ class BIM_PT_aggregate(Panel):
         if props.is_editing_aggregate:
             row = self.layout.row(align=True)
             row.prop(props, "relating_object", text="")
-            row.operator("bim.assign_object", icon="CHECKMARK", text="").relating_object = props.relating_object.name
+            if props.relating_object:
+                row.operator("bim.assign_object", icon="CHECKMARK", text="").relating_object = props.relating_object.name
             row.operator("bim.disable_editing_aggregate", icon="X", text="")
         else:
             row = self.layout.row(align=True)

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

@@ -20,12 +20,16 @@ classes = (
     operator.EnableEditingStructuralConnectionCondition,
     operator.DisableEditingStructuralConnectionCondition,
     operator.RemoveStructuralConnectionCondition,
+    operator.EnableEditingStructuralMemberAxis,
+    operator.DisableEditingStructuralMemberAxis,
+    operator.EditStructuralMemberAxis,
     prop.StructuralAnalysisModel,
     prop.BIMStructuralProperties,
     prop.BIMObjectStructuralProperties,
     ui.BIM_PT_structural_analysis_models,
     ui.BIM_PT_structural_boundary_conditions,
     ui.BIM_PT_connected_structural_members,
+    ui.BIM_PT_structural_member,
     ui.BIM_UL_structural_analysis_models,
 )
 

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

@@ -2,6 +2,8 @@ import bpy
 import json
 import ifcopenshell
 import ifcopenshell.api
+from math import degrees
+from mathutils import Vector, Matrix
 from blenderbim.bim.ifc import IfcStore
 from ifcopenshell.api.structural.data import Data
 from ifcopenshell.api.context.data import Data as ContextData
@@ -363,3 +365,74 @@ class UnassignStructuralAnalysisModel(bpy.types.Operator):
         )
         Data.load(IfcStore.get_file())
         return {"FINISHED"}
+
+
+class EnableEditingStructuralMemberAxis(bpy.types.Operator):
+    bl_idname = "bim.enable_editing_structural_member_axis"
+    bl_label = "Enable Editing Structural Member Axis"
+
+    def execute(self, context):
+        obj = bpy.context.active_object
+        oprops = obj.BIMObjectProperties
+        props = obj.BIMStructuralProperties
+
+        self.file = IfcStore.get_file()
+        member = self.file.by_id(oprops.ifc_definition_id)
+        z_axis = Vector(member.Axis.DirectionRatios).normalized() @ obj.matrix_world if member.Axis else None
+        x_axis = (obj.data.vertices[1].co - obj.data.vertices[0].co).normalized()
+        location = obj.data.vertices[0].co
+        empty = bpy.data.objects.new("Member Axis", None)
+        empty.empty_display_type = "ARROWS"
+        if z_axis:
+            y_axis = (z_axis.cross(x_axis)).normalized()
+            empty.matrix_world = Matrix((
+                (x_axis[0], y_axis[0], z_axis[0], location[0]),
+                (x_axis[1], y_axis[1], z_axis[1], location[1]),
+                (x_axis[2], y_axis[2], z_axis[2], location[2]),
+                (0, 0, 0, 1),
+            ))
+        else:
+            empty.location = location
+            empty.rotation_mode = "QUATERNION"
+            empty.rotation_quaternion = x_axis.to_track_quat("X", "Z")
+
+        props.axis_angle = degrees(empty.rotation_euler[0])
+        props.axis_empty = empty
+        context.scene.collection.objects.link(empty)
+
+        props.is_editing_axis = True
+        return {"FINISHED"}
+
+
+class DisableEditingStructuralMemberAxis(bpy.types.Operator):
+    bl_idname = "bim.disable_editing_structural_member_axis"
+    bl_label = "Disable Editing Structural Member Axis"
+
+    def execute(self, context):
+        obj = bpy.context.active_object
+        props = obj.BIMStructuralProperties
+        props.is_editing_axis = False
+        if props.axis_empty:
+            bpy.data.objects.remove(props.axis_empty)
+        return {"FINISHED"}
+
+
+class EditStructuralMemberAxis(bpy.types.Operator):
+    bl_idname = "bim.edit_structural_member_axis"
+    bl_label = "Edit Structural Member Axis"
+
+    def execute(self, context):
+        obj = bpy.context.active_object
+        oprops = obj.BIMObjectProperties
+        props = obj.BIMStructuralProperties
+        relative_matrix = props.axis_empty.matrix_world @ obj.matrix_world.inverted()
+        z_axis = relative_matrix.col[2][0:3]
+        self.file = IfcStore.get_file()
+        ifcopenshell.api.run(
+            "structural.edit_structural_member_axis",
+            self.file,
+            structural_member=self.file.by_id(oprops.ifc_definition_id),
+            axis=z_axis,
+        )
+        bpy.ops.bim.disable_editing_structural_member_axis()
+        return {"FINISHED"}

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

@@ -1,4 +1,5 @@
 import bpy
+from math import radians
 from blenderbim.bim.prop import StrProperty, Attribute
 from bpy.types import PropertyGroup
 from bpy.props import (
@@ -13,6 +14,19 @@ from bpy.props import (
 )
 
 
+def updateAxisAngle(self, context):
+    if not self.axis_empty:
+        return
+    obj = context.active_object
+    empty = self.axis_empty
+    x_axis = obj.data.vertices[1].co - obj.data.vertices[0].co
+    empty.location = obj.data.vertices[0].co
+    empty.rotation_mode = "QUATERNION"
+    empty.rotation_quaternion = x_axis.to_track_quat("X", "Z")
+    empty.rotation_mode = "XYZ"
+    empty.rotation_euler[0] = radians(self.axis_angle)
+
+
 class StructuralAnalysisModel(PropertyGroup):
     name: StringProperty(name="Name")
     ifc_definition_id: IntProperty(name="IFC Definition ID")
@@ -33,3 +47,6 @@ class BIMObjectStructuralProperties(PropertyGroup):
     active_boundary_condition: IntProperty(name="Active Boundary Condition")
     active_connects_structural_member: IntProperty(name="Active Connects Structural Member")
     relating_structural_member: PointerProperty(name="Relating Structural Member", type=bpy.types.Object)
+    is_editing_axis: BoolProperty(name="Is Editing Axis", default=False)
+    axis_angle: FloatProperty(name="Axis Angle", update=updateAxisAngle)
+    axis_empty: PointerProperty(name="Axis Empty", type=bpy.types.Object)

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

@@ -141,6 +141,44 @@ class BIM_PT_connected_structural_members(Panel):
         draw_boundary_condition_ui(box, data["AppliedCondition"], data["id"], self.props)
 
 
+class BIM_PT_structural_member(Panel):
+    bl_label = "IFC Structural Member"
+    bl_idname = "BIM_PT_structural_member"
+    bl_options = {"DEFAULT_CLOSED"}
+    bl_space_type = "PROPERTIES"
+    bl_region_type = "WINDOW"
+    bl_context = "object"
+
+    @classmethod
+    def poll(cls, context):
+        if not context.active_object:
+            return False
+        props = context.active_object.BIMObjectProperties
+        if not props.ifc_definition_id:
+            return False
+        if not IfcStore.get_file().by_id(props.ifc_definition_id).is_a("IfcStructuralMember"):
+            return False
+        return True
+
+    def draw(self, context):
+        self.oprops = context.active_object.BIMObjectProperties
+        self.props = context.active_object.BIMStructuralProperties
+        self.file = IfcStore.get_file()
+
+        if self.file.by_id(self.oprops.ifc_definition_id).is_a("IfcStructuralCurveMember"):
+            if self.props.is_editing_axis:
+                row = self.layout.row(align=True)
+                row.prop(self.props, "axis_angle")
+                row.operator("bim.edit_structural_member_axis", text="", icon="CHECKMARK")
+                row.operator("bim.disable_editing_structural_member_axis", text="", icon="CANCEL")
+            else:
+                row = self.layout.row()
+                row.operator("bim.enable_editing_structural_member_axis", text="Edit Axis", icon="GREASEPENCIL")
+        else:
+            row = self.layout.row()
+            row.label(text="TODO")
+
+
 class BIM_PT_structural_analysis_models(Panel):
     bl_label = "IFC Structural Analysis Models"
     bl_idname = "BIM_PT_structural_analysis_models"

src/ifcopenshell-python/ifcopenshell/api/structural/edit_structural_member_axis.py

@@ -0,0 +1,11 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"structural_member": None, "axis": [0.0, 0.0, 1.0]}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        if self.file.get_inverse(self.settings["structural_member"].Axis) == 1:
+            self.file.remove(self.settings["structural_member"].Axis)
+        self.settings["structural_member"].Axis = self.file.createIfcDirection(self.settings["axis"])