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normal problems

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hi guys, anyone knows why my vertex normal is opposing my prim normal? 

In maya, the mesh is fine but when I bring it in as alembic file some meshes have this problem.


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Ok my bad for not explaining the details. I do know how to get the packed alembic to polygon and correct them using reverse sop or post normal calculation.

But the problem is some of my meshes normal are flipped and some are fine which is unpredictable as if I put down the reverse sop for example, the initial flipped normal will be corrected and the original correct normal will be flipped.

In maya everything is fine. So I was wondering maybe I did miss something in the exporting and importing process cause I dont feel like selecting all those flipped meshes and reverse them myself :(

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