T-Splines fails to convert a simple 30 face cylinder OBJ import ???

[cekuhnen]

I hope this is just a big big misunderstanding from T-Splines here.

[PhilProcarioJr]

@cekuhnen

It's because of the top and bottom of the cylinder having ngons...those get converted to triangles and T-Splines in Fusion can't handle this. You either need to quad those two faces or delete them in the .obj. I have to ask though why not just create this with the tools in sculpt? It would take a few seconds.

[cekuhnen]

In the past it was able to convert NGONS and now it cannot convert ngons?

Either they removed this ability or it is a different new problem.

You can see if you import it without the face

fill the face and then crease the edge

you will get the same shape.

TS can do NGONS looks like the converter has a new bridge / filter build in.

While Fusion offers TS I do mainly not model in it, because in more dedicated sub-d modelers you have a better workflow with more tools.

The modeling steps I wrote above take quite some time for TS to calculate making it very slow in those areas.

[PhilProcarioJr]

@cekuhnen

It can convert ngons but in cases like this it makes bad decisions on how to handle them. I'm not sure what they have changed with them I just know that I have worked extensively with T-Splines over the last few months and have found cases like this to not work. Not sure what it did in the past.

"While Fusion offers TS I do mainly not model in it, because in more dedicated sub-d modelers you have a better workflow with more tools.

The modeling steps I wrote above take quite some time for TS to calculate making it very slow in those areas."

I completely agree with the statement above, this is why I asked for modeling tools matching Sub-D modelers in the sculpt environment a while ago. T-Splines in Fusion have so much potential that is wasted by lack of the proper tools. At least that's my opinion.

[colin.smith]

@cekuhnen - Nothing has changed in the converter.  I suspect @PhilProcarioJr is correct with his assessment. We are working on new code for conversion of triangle mesh to quads within Fusion.

@PhilProcarioJr - I agree that there is room for improvement on the T-Spline/SubD front.  There is a project underway that combines T-Splines with Open SubDivs.  We intend to absorb that functionality in to Fusion when it is ready and we have the resources to put on it. 

Colin

[cekuhnen]

@colin.smithActually I know that shapes like this worked before because I did it!

Looking forward to the new mesh sub-d / TS module.

I hope that his can help withthe slow speed of TS and give use faster sub-d modeling and then use TS when it is time for BREPing!