Their use is for rapid prototyping and FEM analysis. As a rule, mesh formats are unsuited for CAD. To quote Wikipedia, polygonal modeling is an approach for modeling objects by representing or approximating their surfaces using polygons. If unsure, choose the first one.īut you need to know that STL is a mesh format, like those done with a polygonal modeller (SketchUp is a polygonal modeller). stp extension and click OK in the dialog, either select "CAD formats (PART)" or STEP 214 (Import). Each conversion means that the program has to choose how to deal with the differences between IGS and its own representation.
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