Hi davide,
re:
> Just trying to import this STL file into MoI, tried to convert it into DXF, 3DM, STEP format
> using C4D and Rhino5 trial without success, MoI didn't load anything.
>
> Just to know what I'm doing wrong.
As others wrote above, the problem is that STL is a polygon mesh format - that means the model data in the file is made up of a whole bunch of little flat triangle facet pieces. That is a very different kind of model data than the curves and spline surfaces that MoI works with at modeling time.
It is possible to convert from smooth spline surfaces into triangles by dicing up the large surfaces into little facets which is what MoI will do when you export to STL format. But it is not very easy to try and do the reverse and try to form large smooth surface patches out of already diced up little flat pieces. So that's why there isn't any regular way to import STL facet data into Moi - MoI is not designed to work with that type of data at modeling time, it only deals with that type of data for export.
It is possible in some cases to convert polygon mesh data into spline surfaces, like with Rhino's MeshToNurb command but I would not recommend it for general purpose use because CAD programs like MoI are not really designed to work with models made up of a huge number of little flat pieces that only approximate a curved surface, CAD programs are designed to work with larger actual smooth surfaces.
What is it that you are trying to do with the STL file that you wanted to load into MoI? You will probably need to use a polygon mesh editing program to work on it, not MoI.
Hope this helps explain things - different file formats can represent 3D models in very different ways and programs tend to be focused on working with one particular style of data. STL data is a triangle mesh type of data and so for loading it in usually you need a polygon mesh editing program for that.
- Michael
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