pvccamera.py 文件源码

def rotation_matrix(a):
    """    Creates a 3D rotation matrix for rotation
        around the axis of the vector a. """
    R = eye(4)
    R[:3,:3] = linalg.expm([[0,-a[2],a[1]],[a[2],0,-a[0]],[-a[1],a[0],0]])
    return R