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Diffstat (limited to 'doc/python_api/examples/bpy.types.Depsgraph.6.py')
-rw-r--r--doc/python_api/examples/bpy.types.Depsgraph.6.py61
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diff --git a/doc/python_api/examples/bpy.types.Depsgraph.6.py b/doc/python_api/examples/bpy.types.Depsgraph.6.py
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+++ b/doc/python_api/examples/bpy.types.Depsgraph.6.py
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+"""
+Dependency graph: Simple exporter
++++++++++++++++++++++++++++++++++
+
+This example is a combination of all previous ones, and shows how to write a simple exporter
+script.
+"""
+import bpy
+
+
+class OBJECT_OT_simple_exporter(bpy.types.Operator):
+ """Simple (fake) exporter of selected objects"""
+ bl_label = "DEG Export Selected"
+ bl_idname = "object.simple_exporter"
+
+ apply_modifiers: bpy.props.BoolProperty(name="Apply Modifiers")
+
+ def execute(self, context):
+ depsgraph = context.evaluated_depsgraph_get()
+ for object_instance in depsgraph.object_instances:
+ if not self.is_object_instance_from_selected(object_instance):
+ # We only export selected objects
+ continue
+ # NOTE: This will create a mesh for every instance, which is not ideal at all. In
+ # reality destination format will support some sort of instancing mechanism, so the
+ # code here will simply say "instance this object at object_instance.matrix_world".
+ mesh = self.create_mesh_for_object_instance(object_instance)
+ if mesh is None:
+ # Happens for non-geometry objects.
+ continue
+ print(f"Exporting mesh with {len(mesh.vertices)} vertices "
+ f"at {object_instance.matrix_world}")
+ bpy.data.meshes.remove(mesh)
+
+ return {'FINISHED'}
+
+ def is_object_instance_from_selected(self, object_instance):
+ # For instanced objects we check selection of their instancer (more accurately: check
+ # selection status of the original object corresponding to the instancer).
+ if object_instance.parent:
+ return object_instance.parent.original.select_get()
+ # For non-instanced objects we check selection state of the original object.
+ return object_instance.object.original.select_get()
+
+ def create_mesh_for_object_instance(self, object_instance):
+ if self.apply_modifiers:
+ return object_instance.object.to_mesh()
+ else:
+ return object_instance.object.original.to_mesh()
+
+
+def register():
+ bpy.utils.register_class(OBJECT_OT_simple_exporter)
+
+
+def unregister():
+ bpy.utils.unregister_class(OBJECT_OT_simple_exporter)
+
+
+if __name__ == "__main__":
+ register()