t/glTF/NormalTangentMirrorTest.gltf'
		).then(function(result) {
			root = result.root;
			root.children[0].material.envMap = cubeTexture;

			root.scale.set(20, 20, 20);
			root.position.set(-20, 0, 0);

			vnh = new VertexNormalsHelper(root.children[0], 0.5);
			scene.add(vnh);

			box = new BoxHelper(root);
			scene.add(box);

			vth = new VertexTangentsHelper(root.children[0], 0.5);
			scene.add(vth);

			scene.add(root);
		}).catch(e => console.error(e));

		const grid = new GridHelper(50, 20, 0xff0000