四元素的乘法－注意左乘和右乘是有区别的

SCNQuaternion QuaternionMult(SCNQuaternion lhs,SCNQuaternion rhs) { SCNQuaternion v = {lhs.w * rhs.x + lhs.x * rhs.w + lhs.y * rhs.z - lhs.z * rhs.y, lhs.w * rhs.y + lhs.y * rhs.w + lhs.z * rhs.x

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