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rotation per prim

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I'm trying to do a rotation per prim effect and the orientation axis will be the cross product of up and normal.


but i find it is very difficult to find a bulletproof way to find the orientation axis.


jt wonder if anyone has done this type of effect before can give me some advice? 


here is where i get so far.


i really appreciate your time to help me out with my question.




Edited by mrcoolmen
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