aterial = new t3d.PhongMaterial();
		wallMaterial.diffuse.setHex(0x989898);

		const planeTop = new t3d.Mesh(planeGeometry, planeTopMaterial);
		planeTop.euler.set(Math.PI, 0, 0);
		planeTop.position.y = 100;
		scene.add(planeTop);

		const planeBottom = new t3d.Mesh(planeGeometry, floorMaterial);
		scene.add(planeBottom);

		const planeBack = new t3d.Mesh(planeGeometry, wallMaterial);
		planeBack.euler.set(90 / 180 * Math.PI, 0, 0);
		planeBack.position.z = -50;
		planeBack.position.y = 50;
		scene.add(pla