feat(referenceId): Add referenceId export

Makes it possible to export referenced i3d files directly from Blender.

Close #190

addon/i3dio/i3d.py

@@ -234,6 +234,9 @@ def add_file_image(self, path_to_file: str) -> int:
     def add_file_shader(self, path_to_file: str) -> int:
         return self.add_file(Shader, path_to_file)
 
+    def add_file_reference(self, path_to_file: str) -> int:
+        return self.add_file(Reference, path_to_file)
+
     def get_setting(self, setting: str):
         return self.settings[setting]
 

addon/i3dio/node_classes/file.py

@@ -117,4 +117,8 @@ class Image(File):
 
 
 class Shader(File):
-    MODHUB_FOLDER = 'shaders'
+    MODHUB_FOLDER = 'shaders'
+
+
+class Reference(File):
+    MODHUB_FOLDER = 'assets'

addon/i3dio/node_classes/node.py

@@ -153,6 +153,13 @@ def _write_user_attributes(self):
         except AttributeError:
             pass
 
+    def _add_reference_file(self):
+        if self.blender_object.i3d_reference_path == "" or not self.blender_object.i3d_reference_path.endswith('.i3d'):
+            return
+        self.logger.debug(f"Adding reference file")
+        file_id = self.i3d.add_file_reference(self.blender_object.i3d_reference_path)
+        self._write_attribute('referenceId', file_id)
+
     @property
     @abstractmethod
     def _transform_for_conversion(self) -> Union[mathutils.Matrix, None]:
@@ -206,6 +213,7 @@ def populate_xml_element(self):
         self._write_properties()
         self._write_user_attributes()
         self._add_transform_to_xml_element(self._transform_for_conversion)
+        self._add_reference_file()
 
     def add_child(self, node: SceneGraphNode):
         self.children.append(node)

addon/i3dio/ui/object.py

@@ -815,6 +815,25 @@ def draw(self, context):
                 obj.i3d_attributes.property_unset(prop[0])
 
 
+@register
+class I3D_IO_PT_reference_file(Panel):
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_label = 'Reference File'
+    bl_context = 'object'
+    bl_parent_id = 'I3D_IO_PT_object_attributes'
+
+    @classmethod
+    def poll(cls, context):
+        return context.object is not None and context.object.type == 'EMPTY'
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+        layout.prop(context.object, 'i3d_reference_path')
+
+
 @register
 class I3DMappingData(bpy.types.PropertyGroup):
     is_mapped: BoolProperty(
@@ -852,18 +871,25 @@ def draw(self, context):
         row = layout.row()
         row.prop(obj.i3d_mapping, 'mapping_name')
 
+
 def register():
     for cls in classes:
         bpy.utils.register_class(cls)
     bpy.types.Object.i3d_attributes = PointerProperty(type=I3DNodeObjectAttributes)
     bpy.types.Object.i3d_merge_group_index = IntProperty(default = -1)
     bpy.types.Object.i3d_mapping = PointerProperty(type=I3DMappingData)
+    bpy.types.Object.i3d_reference_path = StringProperty(
+        name="Reference Path",
+        description="Put the path to the .i3d file you want to reference here",
+        default='',
+        subtype='FILE_PATH')
     bpy.types.Scene.i3dio_merge_groups = CollectionProperty(type=I3DMergeGroup)
     load_post.append(handle_old_merge_groups)
 
 def unregister():
     load_post.remove(handle_old_merge_groups)
     del bpy.types.Scene.i3dio_merge_groups
+    del bpy.types.Object.i3d_reference_path
     del bpy.types.Object.i3d_mapping
     del bpy.types.Object.i3d_merge_group_index
     del bpy.types.Object.i3d_attributes