Function uninstance

packages/functions/src/uninstance.ts:36–71

(_options: UninstanceOptions = UNINSTANCE_DEFAULTS)

 * @category Transforms
 */
export function uninstance(_options: UninstanceOptions = UNINSTANCE_DEFAULTS): Transform {
	return createTransform(NAME, async (document: Document): Promise<void> => {
		const logger = document.getLogger();
		const root = document.getRoot();

		const instanceAttributes = new Set<Accessor>();

		for (const srcNode of document.getRoot().listNodes()) {
			const batch = srcNode.getExtension<InstancedMesh>('EXT_mesh_gpu_instancing');
			if (!batch) continue;

			// For each instance, attach a new Node under the source Node.
			for (const instanceNode of createInstanceNodes(srcNode)) {
				srcNode.addChild(instanceNode);
			}

			for (const instanceAttribute of batch.listAttributes()) {
				instanceAttributes.add(instanceAttribute);
			}

			srcNode.setMesh(null);
			batch.dispose();
		}

		// Clean up unused instance attributes.
		for (const attribute of instanceAttributes) {
			if (attribute.listParents().every((parent) => parent === root)) {
				attribute.dispose();
			}
		}

		document.disposeExtension('EXT_mesh_gpu_instancing');

		logger.debug(`${NAME}: Complete.`);
	});
}

/**
 * Given a {@link Node} with an {@link InstancedMesh} extension, returns a list