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how to save Geom_BSplineSurface to iges or step file

Liu Zhipeng's picture

here I have a Geom_BSplineSurface object, it's ready, I want to save it to hard disk, please tell me how to manipulate it?

I found GeomToIges and GeomToStep modules, and I checked the documents, but I can't find any sample how to use it, and I can't find the api to export to FILE, so I don't know hot to save it to hard disk, please help me.

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