BEPUphysics

Hi,
When I new ConvexHull object, the exceptoion 'Point set is degenerate; convex hulls must have volume.' will throw.I don't know why?
Thank you!

Code: ConvexHull hull = new ConvexHull(verticesList, 1);

That exception is thrown when the provided point set has no volume. For example, it may be a bunch of overlapping points in one spot, or perhaps a triangle. The convex hull algorithm cannot operate on such 'degenerate' point sets.

Which is the correct way to create a plain surface without volume, made out of vertices and triangleindices?

If it's not supposed to be mobile, StaticMesh. If it is, MobileMesh.

But the MobileMesh also throws the Exception "Point set is degenerate; convex hulls must have volume." if it has no volume. Maibe I'm doing something wrong.

Is that in the latest version? If so, could you show the setup that reproduces the issue?

You should get an error if a volumeless MobileMesh is constructed as Solid, but I wouldn't expect that particular exception. I also found and fixed a couple of bugs in the MobileMeshShape initialization for Solid mode a few minutes ago, but it seems to be unrelated.

I just downloaded the latest Version (commit e2ffc7834e35).
I still get the exception.

It's not that bad to me. It's more important to know, that MobileMesh is the way a volumeless freeform has to be created. It's also possible that I'm doing something wrong.

The callstack is:

new MobileMesh()
new MobileMeshShape()
UpdateSurfaceVertices()
ConvexHullHelper.GetConvexHull()
ComputeInitialTetrahedron() --> throws the exception

Many thanks Norno for your help!

I wasn't able to reproduce an uncaught exception. The particular exception implied by that stack trace should never propagate outside of the inertia tensor calculation- something weird is happening there.

However, I went ahead and made another change for the sake of cleanliness and performance which should stop it from happening anyway.