The copied the material index and its smoothness to every grid,
resulting in 4 bytes of memory per base mesh face corner. That's
wasteful, since it's trivial to loop up the original data from the base
mesh attributes as necessary. This way we can also avoid the
dereference.
Use float3, float3x3, and Array for data used for mesh crazyspace
calculation. Propagate the change wherever necessary to not add
more casting to the old C types.
Because `ObjectRuntime` (and therefore `DEGObjectIterData`) became
non-trivial structs, the code that swaps iterators for RNA depsgraph
object iteration had to be changed a bit to be more friendly to C++
memory semantics.
Pull Request: https://projects.blender.org/blender/blender/pulls/114998
Hans Goudey