ngon obj import for t-splines?

[cekuhnen]

Does T-Splines not support NGON OBJ imports? It seems to me it triangulates the mesh once converted to TS.

[deyop]

When you insert an OBJ it can include NGONs of any number of sides.  We don't modify the NGONs to become triangles.  After you insert the OBJ file in with NGONs you can select it and use the Modify - Convert command to convert to a T-Spline.  If the inserted mesh has a high percentage of triangles you will get a warning that informs you the translation to T-Splines will result in a poor model.  Here is a video that shows the two OBJ imports, one with quads and the other with triangles.  If you are bringing in models developed in a subd modeler, import as an OBJ and then convert to turn into T-Splines.  Here is a video that should show how to convert and the difference when the mesh contains a high percentage of triangles.

[cekuhnen]

I think I have to work in my English more.

The problem I mean is converting an OBJ mesh into T-Splines. While the OBJ mesh has NGONs T-Splines turns those into Triangles. I have to manually delete the extra edges and then get the shape in TS I would like to have.

It would be great in case it would be possible to just skip this manual adjustment by hand.

[deyop]

Could you provide a small example file for us to test?

Thanks

[cekuhnen]

here is a demo file, it shows two problems I encounter with TS right now.

http://fusion360.autodesk.com/projects/ngon-and-edge-smoothing-issues

It was mentioned to me here at the AU that NGON OBJ files are currently not supported to be converted into TS objects with the NGON not being triangulated.

[deyop]

Claas,

Unfortunatly that reference you created included no data.  If you can attach the actual OBJ I will test to make sure you can read and convert any polygon.  When we read the OBJ we create the exact number of sides for each polygon, 3, 4, 5, 6.  Any number.  When doing the conversion the NGONs are maintained and singularities or star points are created where needed. 

Your point about, "NGON OBJ files are currently not supported to be converted into TS objects with the NGON not being triangulated" is confusing me as there is no need to triangulate an NGON in order to convert to T-Spline.

Hope you are enjoying AU.

[cekuhnen]

Hi there,

this looks like a bug in Fusion 360.

I just published the file I have in my account to the public hub. In deed there is no mesh.

I also noticed in my Fusion 360 the materials are missing and I can only see the wiremesh.

Here is the OBJ mesh alone.

AU was great good to meet everybody.

[deyop]

OK.  With the example file it is much clearer what the issue is.  Thanks.  Give me a bit to review with development and I will get back with an answer.

[deyop]

We think we have found the bug and will work to resolve it.  Thanks for hanging in there and providing the example.  By the way after proper conversion or hand editing you did the Star Point can be toggled to a T - Point in the Repair Body command.  Just mouse down on Star Point and it will change to T - Point.

Thanks again.

[cekuhnen]

Hi there,

I am glad I was able to help.

Claas