Loading a ConvexShape and creating a ShapeHull is broken

[FDMX2]

Hi,

loading a mesh like shown in the ConvexDecompositionDemo demo is broken. Executing the demo shows the problem:
Expected (and working with BulletSharpGen):

Broken Version with BulletSharpPInvoke:

[AndresTraks]

It's the same as issue #2. Something goes wrong in the C++ HACD code when using P/Invoke, but I haven't found the problem. HACD does work in C++/CLI.

This test shows that HACD already fails in libbulletc, so it's not a bug in the C# part of the wrapper:
https://github.com/AndresTraks/BulletSharpPInvoke/blob/master/libbulletc/test/bulletctest.cpp

[AndresTraks]

It was an issue with the renderer that caused the leftmost mesh to get messed up. The vertex stride wasn't taken into account for StridingMeshInterfaces. This is fixed in af632cf.

But the shapes at the back are still wrong because of HACD.