C# .NET 3D File Manipulation and Conversion API can load and save 3DS, 3MF, AMF, Fbx, DFX, OBJ, PLY, STL, USD, U3D and other formats...3D Studio Max’s ASCII Scene Exporter format RVM Aveva Plant Design...support DXF AutoCAD DXF FBX Autodesk FBX format. From 7.2 to 7...