microelly2 wrote: ↑
Wed May 23, 2018 8:13 pm
I think the task is to find a method which creates for a triangle gab definde by 3 nurbs surfaces a filler consisting of 3 unpatched nurbs.
in my example I used 3 ruled surfaces (along bezier curves) as borders (brown/pink ) and created inside the hole 3 nurbs red, blue green
that's the same strategy i talked about a year ago:
https://forum.freecadweb.org/viewtopic. ... 20#p187547
and that is precisely what i am comparing the filling surface to in my posts above
july 29 2017
Silk has a system that handles N sided patches and gets G2 at the OUTER edges of each 'NStar' (but the center has a slight pinch, and it seems to get worse the more branches the star has)
september 17 2017
they are lightweight and fast, but in my estimation, G1 filling from the surface workbench will often be better overall
i used N 36 control point patches in N 6X6 cubic NURBS surfaces, and that is as far as i want to push it personally. The inner point placement can be refined, but i spent too much energy already in that. the long term goal for me was always
to get the final surface using the OCC filling method. Trimmed fitted surfaces are generally considered the state of the art for odd hole filling, and if we keep scratching, we will uncover how to make the built in G2 functionality work.
july 29 2017
how did you generate your '3 ruled surface example'? can you run it on my 3 border surfaces in the model so we can compare side by side all 3 versions?