godot/modules/gltf/extensions/gltf_document_extension_convert_importer_mesh.cpp

/**************************************************************************/
/*  gltf_document_extension_convert_importer_mesh.cpp                     */
/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "gltf_document_extension_convert_importer_mesh.h"

#include "scene/3d/importer_mesh_instance_3d.h"
#include "scene/3d/mesh_instance_3d.h"
#include "scene/resources/3d/importer_mesh.h"

void GLTFDocumentExtensionConvertImporterMesh::_copy_meta(Object *p_src_object, Object *p_dst_object) {
	List<StringName> meta_list;
	p_src_object->get_meta_list(&meta_list);
	for (const StringName &meta_key : meta_list) {
		Variant meta_value = p_src_object->get_meta(meta_key);
		p_dst_object->set_meta(meta_key, meta_value);
	}
}

Error GLTFDocumentExtensionConvertImporterMesh::import_post(Ref<GLTFState> p_state, Node *p_root) {
	ERR_FAIL_NULL_V(p_root, ERR_INVALID_PARAMETER);
	ERR_FAIL_COND_V(p_state.is_null(), ERR_INVALID_PARAMETER);
	List<Node *> queue;
	queue.push_back(p_root);
	List<Node *> delete_queue;
	while (!queue.is_empty()) {
		List<Node *>::Element *E = queue.front();
		Node *node = E->get();
		ImporterMeshInstance3D *importer_mesh_3d = Object::cast_to<ImporterMeshInstance3D>(node);
		if (importer_mesh_3d) {
			Ref<ImporterMesh> mesh = importer_mesh_3d->get_mesh();
			if (mesh.is_valid()) {
				MeshInstance3D *mesh_instance_node_3d = memnew(MeshInstance3D);
				Ref<ArrayMesh> array_mesh = mesh->get_mesh();
				mesh_instance_node_3d->set_name(node->get_name());
				mesh_instance_node_3d->set_transform(importer_mesh_3d->get_transform());
				mesh_instance_node_3d->set_mesh(array_mesh);
				mesh_instance_node_3d->set_skin(importer_mesh_3d->get_skin());
				mesh_instance_node_3d->set_skeleton_path(importer_mesh_3d->get_skeleton_path());
				mesh_instance_node_3d->set_visible(importer_mesh_3d->is_visible());
				node->replace_by(mesh_instance_node_3d);
				_copy_meta(importer_mesh_3d, mesh_instance_node_3d);
				_copy_meta(mesh.ptr(), array_mesh.ptr());
				delete_queue.push_back(node);
				node = mesh_instance_node_3d;
			} else {
				WARN_PRINT("glTF: ImporterMeshInstance3D does not have a valid mesh. This should not happen. Continuing anyway.");
			}
		}
		int child_count = node->get_child_count();
		for (int i = 0; i < child_count; i++) {
			queue.push_back(node->get_child(i));
		}
		queue.pop_front();
	}
	while (!delete_queue.is_empty()) {
		List<Node *>::Element *E = delete_queue.front();
		Node *node = E->get();
		memdelete(node);
		delete_queue.pop_front();
	}
	return OK;
}