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Hello, I am using Matlab to create a surface I import into Autocad Mechanical 2015. Matlab uses a library to convert a matrix into a .dxf 3D surface. Depending on the option, the surface is either a cloud of points, or made of triangles or square patches (linking the points). (files attached) I can open these files with AutoCAD Mechanical and even export them in other formats (ie. stp), but I would like to convert the cloud of points or the triangles mesh into a surface (mostly to reduce the size of the file). For now I have 4 millions points (which gives me a 19MB .stp file when I export the triangle mesh .dxf file into .stp). I am planning to increase the resolution... So it is not possible to keep all the points and triangle meshs and I hope that there is a way to replace the meshs and points into a surface in order to make it easier to handle by AutoCAD, and lighter to export. (I need to export it in .stp (or similar format) so it can be used by an electromagnetic simulation software (HFSS, CST...)). How can I do with Autodesk product design suite ultimate 2015? (AutoCAD Mechanical, Inventor pro...) Best regards, Fabien triangles_and_points.zip