Tutorials (CornellBox and CornellBoxShadow) use wrong number of vertices

[norsetto]

In the CreateMesh call, nvert is passed as:

int nvert = objshape.mesh.positions.size()

but objshape.mesh.position is a std::vector<float> not a std::vector<float3> so this should really be:

int nvert = objshape.mesh.positions.size() / 3

[manhnt9]

It's just the naming convention is wrong, API needs objshape.mesh.positions.size() to work.
Changing nvert to something else would be better.