(angle, ratio, znear, zfar)
return np.array([[1. / np.tan(angle), 0, 0, 0],
                     [0, ratio / np.tan(angle), 0, 0],
                     [0, 0, (zfar + znear) / (zfar - znear), 1],
                     [0, 0, -2. * zfar * znear / (zfar - znear), 0]])
Return a 4D projection matrix.
    
    Arguments:
      * angle: angle of the field of view, in radians.
      * ratio: W/H ratio of the field of view.
      * znear, zfar: near and far projection planes.
    
    Returns:
      * P: the 4x4 projection matrix.
Return a 4D projection matrix.
    
    Arguments:
      * angle: angle of the field of view, in radians.
      * ratio: W/H ratio of the field of view.
      * znear, zfar: near and far projection planes.
    
    Returns:
      * P: the 4x4 projection matrix.
Return a 4D projection matrix . Arguments : * angle : angle of the field of view in radians . * ratio : W / H ratio of the field of view . * znear zfar : near and far projection planes . Returns : * P : the 4x4 projection matrix .
def projection_matrix(angle, ratio, znear, zfar):
    """Return a 4D projection matrix.
    
    Arguments:
      * angle: angle of the field of view, in radians.
      * ratio: W/H ratio of the field of view.
      * znear, zfar: near and far projection planes.
    
    Returns:
      * P: the 4x4 projection matrix.
      
    """
    return np.array([[1. / np.tan(angle), 0, 0, 0],
                     [0, ratio / np.tan(angle), 0, 0],
                     [0, 0, (zfar + znear) / (zfar - znear), 1],
                     [0, 0, -2. * zfar * znear / (zfar - znear), 0]])
def projection_matrix ( angle , ratio , znear , zfar ) : return np . array ( [ [ 1. / np . tan ( angle ) , 0 , 0 , 0 ] , [ 0 , ratio / np . tan ( angle ) , 0 , 0 ] , [ 0 , 0 , ( zfar + znear ) / ( zfar - znear ) , 1 ] , [ 0 , 0 , - 2. * zfar * znear / ( zfar - znear ) , 0 ] ] )