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by Const-me 1674 days ago
> that can be solved in a new version

Yeah, if in a next version they will move vertex/index buffer data from XML into binary files in the same ZIP (3MF are ZIP files), will be better already. Printing and parsing numbers is surprisingly expensive when you have a gigabyte of them.

> C++ is not a bad idea to write a library

C++ is fine by itself. Still, should the format be simpler, the official library would be optional, as people would be able to implement support in any language without FFI. It’s hard to do in practice, which leaves the official library as the only practical option, IMO. At least that’s what I did when a client asked me to support that format.