IFC Clash in the BlenderBIM Add-on now generates snapshots of clashes in BCF

src/bcf/bcf/bcfxml.py

@@ -476,7 +476,7 @@ class BcfXml:
         if viewpoint.snapshot:
             topic_filepath = os.path.join(self.filepath, topic.guid)
             filepath = os.path.join(topic_filepath, viewpoint.snapshot)
-            if not os.path.exists(filepath):
+            if not os.path.exists(filepath) or topic_filepath not in filepath:
                 filename = viewpoint.guid + "." + viewpoint.snapshot[-3:]
                 copyfile(viewpoint.snapshot, os.path.join(topic_filepath, filename))
                 viewpoint.snapshot = filename

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

@@ -10,9 +10,11 @@ class NewBcfProject(bpy.types.Operator):
     bl_label = "New BCF Project"
 
     def execute(self, context):
+        bpy.context.scene.BCFProperties.is_loaded = False
         bcfxml = bcfstore.BcfStore.get_bcfxml()
         bcfxml.new_project()
         bpy.ops.bim.load_bcf_project()
+        bpy.context.scene.BCFProperties.is_loaded = True
         return {"FINISHED"}
 
 
@@ -22,6 +24,7 @@ class LoadBcfProject(bpy.types.Operator):
     filepath: bpy.props.StringProperty(subtype="FILE_PATH")
 
     def execute(self, context):
+        bpy.context.scene.BCFProperties.is_loaded = False
         bcfxml = bcfstore.BcfStore.get_bcfxml()
         if self.filepath:
             bcfxml.get_project(self.filepath)

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1588,6 +1588,28 @@ class ExecuteIfcClash(bpy.types.Operator):
         settings.logger = logging.getLogger("Clash")
         settings.logger.setLevel(logging.DEBUG)
         ifc_clasher = ifcclash.IfcClasher(settings)
+
+        if bpy.context.scene.BIMProperties.should_create_clash_snapshots:
+            def get_viewpoint_snapshot(self, viewpoint, mat):
+                camera = bpy.data.objects.get('IFC Clash Camera')
+                if not camera:
+                    camera = bpy.data.objects.new("IFC Clash Camera", bpy.data.cameras.new("IFC Clash Camera"))
+                    bpy.context.scene.collection.objects.link(camera)
+                camera.matrix_world = Matrix(mat)
+                bpy.context.scene.camera = camera
+                camera.data.angle = radians(60)
+                area = next(area for area in bpy.context.screen.areas if area.type == "VIEW_3D")
+                area.spaces[0].region_3d.view_perspective = "CAMERA"
+                area.spaces[0].shading.show_xray = True
+                bpy.context.scene.render.resolution_x = 480
+                bpy.context.scene.render.resolution_y = 270
+                bpy.context.scene.render.image_settings.file_format = "PNG"
+                bpy.context.scene.render.filepath = os.path.join(bpy.context.scene.BIMProperties.data_dir, "snapshot.png")
+                bpy.ops.render.opengl(write_still=True)
+                return bpy.context.scene.render.filepath
+
+            ifcclash.IfcClasher.get_viewpoint_snapshot = get_viewpoint_snapshot
+
         ifc_clasher.clash_sets = []
         for clash_set in bpy.context.scene.BIMProperties.clash_sets:
             self.a = []

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1358,6 +1358,7 @@ class BIMProperties(PropertyGroup):
     blender_clash_set_a: CollectionProperty(name="Blender Clash Set A", type=StrProperty)
     blender_clash_set_b: CollectionProperty(name="Blender Clash Set B", type=StrProperty)
     clash_sets: CollectionProperty(name="Clash Sets", type=ClashSet)
+    should_create_clash_snapshots: BoolProperty(name="Create Snapshots", default=True)
     clash_results_path: StringProperty(name="Clash Results Path")
     smart_grouped_clashes_path: StringProperty(name="Smart Grouped Clashes Path")
     active_clash_set_index: IntProperty(name="Active Clash Set Index")

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -2172,9 +2172,9 @@ class BIM_PT_ifcclash(Panel):
                 row.prop(source, "selector", text="")
 
             row = layout.row()
+            row.prop(props, "should_create_clash_snapshots")
+            row = layout.row(align=True)
             row.operator("bim.execute_ifc_clash")
-
-            row = layout.row()
             row.operator("bim.select_ifc_clash_results")
 
 

src/ifcclash/ifcclash.py

@@ -187,12 +187,25 @@ class IfcClasher:
                 viewpoint.perspective_camera.camera_up_vector.x = mat[0][1]
                 viewpoint.perspective_camera.camera_up_vector.y = mat[1][1]
                 viewpoint.perspective_camera.camera_up_vector.z = mat[2][1]
+                viewpoint.components = bcf.data.Components()
+                c1 = bcf.data.Component()
+                c1.ifc_guid = clash["a_global_id"]
+                c2 = bcf.data.Component()
+                c2.ifc_guid = clash["b_global_id"]
+                viewpoint.components.selection.append(c1)
+                viewpoint.components.selection.append(c2)
+                viewpoint.components.visibility = bcf.data.ComponentVisibility()
+                viewpoint.components.visibility.default_visibility = True
+                viewpoint.snapshot = self.get_viewpoint_snapshot(viewpoint, mat)
                 bcfxml.add_viewpoint(topic, viewpoint)
             if i == 0:
                 bcfxml.save_project(self.settings.output)
             else:
                 bcfxml.save_project(self.settings.output + f".{i}")
 
+    def get_viewpoint_snapshot(self, viewpoint, mat):
+        return None # Possible to overload this function in a GUI application if used as a library
+
     # https://blender.stackexchange.com/questions/68834/recreate-to-track-quat-with-two-vectors-using-python/141706#141706
     def get_track_to_matrix(self, camera_position, target_position):
         camera_direction = camera_position - target_position