edit shape aspect attributes from UI

example - https://i.imgur.com/SzUEn6r.png

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

@@ -58,6 +58,7 @@ classes = (
     operator.DisableEditingRepresentationItemShapeAspect,
     operator.RemoveRepresentationItemFromShapeAspect,
     prop.RepresentationItem,
+    prop.ShapeAspect,
     prop.BIMObjectGeometryProperties,
     prop.BIMGeometryProperties,
     ui.BIM_PT_placement,

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

@@ -1715,6 +1715,12 @@ class EditRepresentationItemShapeAspect(bpy.types.Operator, Operator):
         ifc_file = tool.Ifc.get()
 
         shape_aspect = ifc_file.by_id(int(props.representation_item_shape_aspect))
+
+        # set attributes from UI
+        shape_aspect_attrs = props.shape_aspect_attrs
+        shape_aspect.Name = shape_aspect_attrs.name
+        shape_aspect.Description = shape_aspect_attrs.description
+
         representation_item_id = props.items[props.active_item_index].ifc_definition_id
         representation_item = ifc_file.by_id(representation_item_id)
 

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

@@ -17,6 +17,7 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+import blenderbim.tool as tool
 from blenderbim.bim.prop import StrProperty, Attribute
 from blenderbim.bim.module.geometry.data import RepresentationsData
 from bpy.types import PropertyGroup
@@ -62,6 +63,20 @@ def get_shape_aspects(self, context):
     return RepresentationsData.data["shape_aspects"]
 
 
+def get_material_constituents(self, context, edit_text):
+    # TODO: cache in data.py
+    return [m.Name for m in tool.Ifc.get().by_type("IfcMaterialConstituent") if m.Name]
+
+
+def update_shape_aspect(self, context):
+    shape_aspect_id = self.representation_item_shape_aspect
+    attrs = self.shape_aspect_attrs
+
+    shape_aspect = tool.Ifc.get().by_id(int(shape_aspect_id))
+    attrs.name = shape_aspect.Name or ""
+    attrs.description = shape_aspect.Description or ""
+
+
 class RepresentationItem(PropertyGroup):
     name: StringProperty(name="Name")
     surface_style: StringProperty(name="Surface Style")
@@ -71,6 +86,20 @@ class RepresentationItem(PropertyGroup):
     shape_aspect_id: IntProperty(name="Shape Aspect IFC ID")
 
 
+class ShapeAspect(PropertyGroup):
+    name: StringProperty(
+        name="Name",
+        description=(
+            "Note that IfcMaterialConstituent is applied based on shape aspects using the same name as material constituent.\n"
+            "In dropdown suggestions you can see names of existing material constituents."
+        ),
+        search=get_material_constituents,
+    )
+    description: StringProperty(
+        name="Description",
+    )
+
+
 class BIMObjectGeometryProperties(PropertyGroup):
     contexts: EnumProperty(items=get_contexts, name="Contexts")
     is_editing: BoolProperty(name="Is Editing", default=False)
@@ -79,7 +108,10 @@ class BIMObjectGeometryProperties(PropertyGroup):
     is_editing_item_style: BoolProperty(name="Is Editing Item's Style", default=False)
     representation_item_style: EnumProperty(items=get_styles, name="Representation Item Style")
     is_editing_item_shape_aspect: BoolProperty(name="Is Editing Item's Shape Aspect", default=False)
-    representation_item_shape_aspect: EnumProperty(items=get_shape_aspects, name="Representation Item Shape Aspect")
+    representation_item_shape_aspect: EnumProperty(
+        items=get_shape_aspects, name="Representation Item Shape Aspect", update=update_shape_aspect
+    )
+    shape_aspect_attrs: PointerProperty(type=ShapeAspect)
 
 
 class BIMGeometryProperties(PropertyGroup):

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

@@ -218,6 +218,11 @@ class BIM_PT_representation_items(Panel):
             row.prop(props, "representation_item_shape_aspect", icon="SHAPEKEY_DATA", text="")
             row.operator("bim.edit_representation_item_shape_aspect", icon="CHECKMARK", text="")
             row.operator("bim.disable_editing_representation_item_shape_aspect", icon="CANCEL", text="")
+
+            shape_aspect_attrs = props.shape_aspect_attrs
+            self.layout.label(text="Shape Aspect Attributes:")
+            self.layout.prop(shape_aspect_attrs, "name")
+            self.layout.prop(shape_aspect_attrs, "description")
         else:
             row.label(text=shape_aspect or "No Shape Aspect", icon="SHAPEKEY_DATA")
             row.operator("bim.enable_editing_representation_item_shape_aspect", icon="GREASEPENCIL", text="")