def glFrustum(left, right, bottom, top, zNear, zFar):
    """Multiply the current matrix by a perspective matrix 

    :param right: Specify the coordinates for the left and right vertical clipping planes. 
    :param bottom: Specify the coordinates for the bottom and top horizontal clipping planes. 
    :param zFar: Specify the distances to the near and far depth clipping planes. Both distances must be positive. 
    """
    pass
