Oh I see, you are using the newton mesh tool to optimize your meshes.
I will add the mesh simplification.
The convex approximation we are not going to add because that was from the time when newton decomposition was better than the one by Kalet Mammut,
But since them, he has made so much progress that there is not context anymore. And it is silly to re invent it.
What I am going to do is that I will integrate his version and
Made an utility that uses his library.
This will be over the weekend.
I assume you are using compound collision.