Suggestions

If you have any suggestions for additional Volvox functions, please write them down here.

Replies to This Discussion

Permalink Reply by Vongsawat Wongkijjalerd on July 1, 2016 at 2:02am

add UserData straight from the file, using the loading mask to apply key names
i.e. x;y;z;r;g;b;a;q;bob;trigger1

Permalink Reply by Pieter Segeren on September 9, 2016 at 2:46pm

Hi Mateusz and Hendrik,
great job you guys did on Volvox!

Just a quick message:

The ClippingPlane component in Volvox re-enables all 'clipped views' checkboxes (in clipping plane properties) on recalculation of GH solution, for all clipping planes.
Would it be achievable to set the clipping planes properties (which views get clipped), and not destroy these settings on recalculation?
End of message.

kind regards,
Pieter Segeren

Permalink Reply by phillip on November 29, 2016 at 3:42am

Hi Mateusz,

right now I am running some tests on Volvox. Is it possible to create the alpha shape from the cloud directly?

Best,

phillip

Permalink Reply by Mateusz Zwierzycki on November 29, 2016 at 4:33am

Do you mean 3d alpha shape? Nope. We would need a .NET implementation of 3d Delaunay triangulation first, and at the current moment we have none of those ;/ Too bad the computation geometry guys all stick to the C++ and CGAL.

In general - 3d Delaunay is hard, it's just a different type of problem than 2d - there are ambiguous cases which you need to solve somehow, and AFAIK a good quality 3d triangulation is a result of a good solver... there is no need for a solver in 2d, you just incrementally add triangles and voila. Hence the lack of implementations - it just takes a hell lot of work to do it.

One could think you can just translate the CGAL code, but this library is so vast and self-dependent that you would probably end up translating quite a big portion of it just for the 3d triangulation.

EDIT: Just take a look at this https://github.com/ashwin/gStar4D/blob/master/gdel3d_thesis.pdf

and compare it with the incremental method in 2d

https://en.wikipedia.org/wiki/Delaunay_triangulation

Permalink Reply by phillip on November 29, 2016 at 8:39am

I see. Thanks!

Permalink Reply by Dongwook Hwang on February 11, 2018 at 4:27am