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How to recover a Geom_Surface object original data value?

JiangMing's picture

My question is when i have transformed a Geom_Surface object with a gp_trsf a for acquiring the face data in the new location,how can i recover te Geom_Surface object to its original value?

I have tried to use another transformation b=a.Inverted() ,but the result is not the same as before.

Who can help me?