.side = t3d.DRAW_SIDE.DOUBLE;
		const box = new t3d.Mesh(box_geometry, box_material);
		box.position.set(50, 20, -10);
		box.shadowType = t3d.SHADOW_TYPE.PCF5_SOFT;
		box.castShadow = true;
		box.receiveShadow = true;
		scene.add(box);

		const plane_geometry = new t3d.PlaneGeometry(2000, 2000);
		const plane_material = new t3d.LambertMaterial();
		plane_material.diffuse.setHex(0x999999);
		plane_material.dithering = true;
		const plane = new t3d.Mesh(plane_geometry, plane_material);
		plane.shadowType = t3