Group of breps vs polysurface

@Pablo_Garcia-Amorena wrote:

Hello,

I wonder what are the differences between a set of breps joined as polysurface or the same set joined as a group.

Does a polysurface have a unique id (and a group several ids)?

Can one attach a single instance of ON_UserData to a whole group, like with polysurfaces?

Also, when a single brep is modified, does its whole corresponding polysurface have to be replaced (but not the whole group)?

Thanks,
Pablo

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