WIP implement add/remove material. See #1222.

src/ifcblenderexport/blenderbim/bim/module/material/__init__.py

@@ -2,6 +2,8 @@ import bpy
 from . import ui, prop, operator
 
 classes = (
+    operator.AddMaterial,
+    operator.RemoveMaterial,
     operator.AssignMaterial,
     operator.UnassignMaterial,
     operator.AddConstituent,
@@ -17,6 +19,7 @@ classes = (
     operator.DisableEditingMaterialSetItem,
     operator.EditMaterialSetItem,
     prop.BIMObjectMaterialProperties,
+    ui.BIM_PT_material,
     ui.BIM_PT_object_material,
 )
 

src/ifcblenderexport/blenderbim/bim/module/material/add_material.py

@@ -0,0 +1,12 @@
+import ifcopenshell
+
+
+class Usecase:
+    def __init__(self, file, settings=None):
+        self.file = file
+        self.settings = {"Name": "Unnamed"}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        return self.file.create_entity("IfcMaterial", **{"Name": self.settings["Name"] or "Unnamed"})

src/ifcblenderexport/blenderbim/bim/module/material/operator.py

@@ -1,4 +1,6 @@
 import bpy
+import blenderbim.bim.module.material.add_material as add_material
+import blenderbim.bim.module.material.remove_material as remove_material
 import blenderbim.bim.module.material.assign_material as assign_material
 import blenderbim.bim.module.material.unassign_material as unassign_material
 import blenderbim.bim.module.material.add_constituent as add_constituent
@@ -13,6 +15,34 @@ from blenderbim.bim.ifc import IfcStore
 from blenderbim.bim.module.material.data import Data
 
 
+class AddMaterial(bpy.types.Operator):
+    bl_idname = "bim.add_material"
+    bl_label = "Add Material"
+    obj: bpy.props.StringProperty()
+
+    def execute(self, context):
+        obj = bpy.data.materials.get(self.obj) if self.obj else bpy.context.active_object.active_material
+        self.file = IfcStore.get_file()
+        result = add_material.Usecase(self.file, {"Name": obj.name}).execute()
+        obj.BIMObjectProperties.ifc_definition_id = result.id()
+        return {"FINISHED"}
+
+
+class RemoveMaterial(bpy.types.Operator):
+    bl_idname = "bim.remove_material"
+    bl_label = "Remove Material"
+    obj: bpy.props.StringProperty()
+
+    def execute(self, context):
+        obj = bpy.data.materials.get(self.obj) if self.obj else bpy.context.active_object.active_material
+        self.file = IfcStore.get_file()
+        result = remove_material.Usecase(
+            self.file, {"material": self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)}
+        ).execute()
+        obj.BIMObjectProperties.ifc_definition_id = 0
+        return {"FINISHED"}
+
+
 class AssignMaterial(bpy.types.Operator):
     bl_idname = "bim.assign_material"
     bl_label = "Assign Material"

src/ifcblenderexport/blenderbim/bim/module/material/remove_material.py

@@ -0,0 +1,23 @@
+import ifcopenshell
+
+
+class Usecase:
+    def __init__(self, file, settings=None):
+        self.file = file
+        self.settings = {"material": None}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        inverse_elements = self.file.get_inverse(self.settings["material"])
+        self.file.remove(self.settings["material"])
+        # TODO: this is probably not robust enough
+        for inverse in inverse_elements:
+            if inverse.is_a("IfcMaterialConstituent"):
+                self.file.remove(inverse)
+            elif inverse.is_a("IfcMaterialLayer"):
+                self.file.remove(inverse)
+            elif inverse.is_a("IfcMaterialProfile"):
+                self.file.remove(inverse)
+            elif inverse.is_a("IfcRelAssociatesMaterial"):
+                self.file.remove(inverse)

src/ifcblenderexport/blenderbim/bim/module/material/ui.py

@@ -3,6 +3,21 @@ from blenderbim.bim.module.material.data import Data
 from blenderbim.bim.ifc import IfcStore
 
 
+class BIM_PT_material(Panel):
+    bl_label = "IFC Material"
+    bl_idname = "BIM_PT_material"
+    bl_space_type = "PROPERTIES"
+    bl_region_type = "WINDOW"
+    bl_context = "material"
+
+    def draw(self, context):
+        row = self.layout.row()
+        if bool(context.active_object.active_material.BIMObjectProperties.ifc_definition_id):
+            row.operator("bim.remove_material", icon="X", text="Remove IFC Material")
+        else:
+            row.operator("bim.add_material", icon="ADD", text="Create IFC Material")
+
+
 class BIM_PT_object_material(Panel):
     bl_label = "IFC Object Material"
     bl_idname = "BIM_PT_object_material"

src/ifcblenderexport/blenderbim/bim/module/pset/prop.py

@@ -31,13 +31,11 @@ def getPsetNames(self, context):
 
 def getMaterialPsetNames(self, context):
     global psetnames
-    if "/" in context.active_object.name:
-        ifc_class = "IfcMaterial"
-        if ifc_class not in psetnames:
-            psets = blenderbim.bim.schema.ifc.psetqto.get_applicable(ifc_class, pset_only=True)
-            psetnames[ifc_class] = [(p.Name, p.Name, "") for p in psets]
-        return psetnames[ifc_class]
-    return []
+    ifc_class = "IfcMaterial"
+    if ifc_class not in psetnames:
+        psets = blenderbim.bim.schema.ifc.psetqto.get_applicable(ifc_class, pset_only=True)
+        psetnames[ifc_class] = [(p.Name, p.Name, "") for p in psets]
+    return psetnames[ifc_class]
 
 
 def getQtoNames(self, context):