@staticmethod
def calc_vertices(size_x, size_z, height=0.0):
    """Return the vertices of a horizontal grid of ``size_x`` by ``size_z``
		cells at a certain ``height``.

		:param size_x: number of cells along the X axis
		:type size_x: positive int
		:param size_z: number of cells along the Z axis
		:type size_z: positive int
		:param height:
		:type height: float

		>>> ConstantHeightfieldTrimesh.calc_vertices(2, 4)
		[(0, 0.0, 0), (0, 0.0, 1), (0, 0.0, 2), ..., (1, 0.0, 3)]

		"""
    verts = []
    for x in range(size_x):
        for z in range(size_z):
            verts.append((x, height, z))
    return verts
