render_model_views.py 文件源码

def camPosToQuaternion(cx, cy, cz):
    camDist = math.sqrt(cx * cx + cy * cy + cz * cz)
    cx = cx / camDist
    cy = cy / camDist
    cz = cz / camDist
    axis = (-cz, 0, cx)
    angle = math.acos(cy)
    a = math.sqrt(2) / 2
    b = math.sqrt(2) / 2
    w1 = axis[0]
    w2 = axis[1]
    w3 = axis[2]
    c = math.cos(angle / 2)
    d = math.sin(angle / 2)
    q1 = a * c - b * d * w1
    q2 = b * c + a * d * w1
    q3 = a * d * w2 + b * d * w3
    q4 = -b * d * w2 + a * d * w3
    return (q1, q2, q3, q4)