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contact of polyhedras

Asked by zhou qian

Hi:
I have 3 questions about the contact of polyhedras:
1.How to caculate the contact point of 2 polyhedras(tetras) ( What's the algorithm of the contact point between 2 tetras since they are not spheres and they don't have central point?)
2.Although a polyhedra consists of lots of points, but they are all separated in tetras in simulations, is that right?
3.what's the difference between the polyhedron in utils and polyhedra in polyhedra_utils?
Yours,
Joe

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Jérôme Duriez
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Best Jérôme Duriez (jduriez) said : 		#1

Hi,

1. and 2.I think Tetra and Polyhedra shapes are actually different and not related one to another. Contact algorithms for Polyhedra are described at https://www.sciencedirect.com/science/article/pii/S0032591014005191

Thanks to CGAL library they apply to any (convex) polyhedron, without any subdivision in Tetra shapes.

3. These two functions both return a body of Polyhedra shape. Their behavior / expected (or useable) attributes indeed differ though. One accepts a random generation of vertices, the other waits for the user to define them, for instance.

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zhou qian (zhoug15) said : 		#2

Thanks Jérôme Duriez, that solved my question.