Optimise PhysX geometry vertex format

[Tomasz Zając]

In LEngine/Physics/PhysicsRigidbody.cpp - PhysicsRigidbody::InitCollider:

The points passed into PxConvexMeshDesc are taken directly from a Lepus3D::Mesh, which consists of an array of Lepus3D::Vertex objects. Each Vertex has fields for UV mapping and normals, which are not needed for physics simulation; we only need x, y, z.

Create a converter that only extracts xyz and change desc.points.stride to size of those 3 coordinates.

[Tomasz Zając]

Updated in 302b1f0