Grasshopper

algorithmic modeling for Rhino

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

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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


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

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

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

I see. Thanks!

Hi

I have a question as to how to get a clean mesh out of cropped pt cloud.

Pt cloud was from a scanned stone and imported in xyz file format. 

It looked like probably I need more pts or some extra information.

Wonder if there could be a way to create a clean mesh without going through the conversion of mesh to surface...

Best,

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