glm.py 文件源码

def lookat(eye, center, up):
    f = normalize(center - eye)
    s = normalize(cross(f, up))
    u = cross(s, f)

    res = identity()
    res[0][0] = s[0]
    res[1][0] = s[1]
    res[2][0] = s[2]
    res[0][1] = u[0]
    res[1][1] = u[1]
    res[2][1] = u[2]
    res[0][2] = -f[0]
    res[1][2] = -f[1]
    res[2][2] = -f[2]
    res[3][0] = -dot(s, eye)
    res[3][1] = -dot(u, eye)
    res[3][2] = -dot(f, eye)
    return res.T