![]() ![]() The ON_Mesh is the same as the control cage - there is n-gon information if necessary, but that is standard in ON_Meshes now. The ON_Brep is a conversion of the T-spline, so if you’re just looking for display, then that would be sufficient. In a 3dm file, the T-spline data is stored as UserData attached to either an ON_Brep or an ON_Mesh, depending on whether you’re in box mode or smooth mode when you save. What are you trying to do with the T-spline data? Are you able to read. ![]() However, you may or may not need to deal with all that stuff. Anyhow, it’s nice for end users, but the storage mechanism is quite complex at this point. Specifically, we went through lots of different variations for how to store t-spline data in a 3dm, and 2.x was backwards compatible with 1.x files, and 3.x is backwards compatible to 2.x files. ![]() So, it is possible to extract the t-spline data out of a 3dm. ![]()
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