Intersection not intersecting

[gcherici]

I modeled a cartoon head using t-Splines.
On the head there are a few flowers, and I'm having trouble with Boolean Union once I translate them to Rhino.
Using Boolean Union some flower petals are united to the main model, while others just "fail".
In the attached file there is one of the petals and a flat surface. They clearly intersect, but if you do an Intersection it appears they only intersect in a few points. And of course it won't Unite, it won't Trim or Split either.
What can I do?

Thank you,
Guido

[JSantocono]

Hi Guido,
Yes, it seems that some of the NURBS patches are bugged. We will look deep into this to fix it.
Thanks for posting this.
Do you still have the T-Splines surface? Maybe changing the regions for conversion (tsSetSurfaceLayout) can help as a workaround.
JuanS

[Joe]

It looks like some of the surfaces are flipping. If you have the original t-spline, that would be helpful in debugging. The tsMakeUniform command might help.

[gcherici]

Hi all,
These are the original t-splines.
I scaled them a bit before converting to nurbs, but they already presented the intersection problem.
I built these t-splines as cylinders, then capped the ends.

On top of getting this intersection error, Rhino kept crashing while working on this file, and in the Backup_recovery files that are generated all or most t-splines are converted to Nurbs.

Thank you,
Guido

[Joe]

Thanks for the file and explanation. We can reproduce the bug here and we'll work on getting it fixed.

In the meantime, you can work around this bug by using tsInsertPointSimple on the first tsFillHole before filling the second hole (I'd recommend doing it for both ends). Here is what it looks like.

cylinder1.jpg (43.19 KiB) Viewed 603 times

cylinder2.jpg (40.48 KiB) Viewed 603 times

cylinder3.jpg (47.55 KiB) Viewed 603 times

[gcherici]

Thanks Joe, this trick saved me!
The bad thing of the Simple operations (vs. Accurate), though, is that the overall shape is always affected.
I hope you can fix this bug soon.

Thank you,
Guido