Appending geometries to existing 3dm file (37.1 KB)

I am making a c# component that writes 3dm file.
This component works fine but I was wondering if it is possible to append to existing 3dm file, like .Net streamwriter append option does.
Also, is 3dm, obj, pdf(FileIO) are the only supported export format that rhinocommon provides? Should I have to make parcer from the scratch for other file formats?

Instead of making a new, empty File3dm, why not populate it from your existing file using the File3dm.Read() methods? Then you can modify the file and save it back out again.

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why didn’t I think of that before…Thanks!!