t2 = Triangle(Vertex(position=(-5, -4, 5), texcoord=(0, 0)),
                 Vertex(position=(5, -4, -5), texcoord=(1, 1)),
                 Vertex(position=(-5,-4, -5), texcoord=(0, 1)),
                 material=
                 TextureMaterial(texturepath=['tex17-1.png', 'tex17-2.png']))