voxels

The vdb_print binary is missing support for VDB Point grids. This would be super useful. Some recommended functionality:

• total/active/inactive point count
• attribute name, type, uniform, index, flags, compression information
• group name and count information
• whether the descriptor is shared (option to print out all descriptors which differ?)

I suggest that this is only implemented f

At the moment I have a single global nphysics world:

/// `World`-global resource for nphysics `World`.
pub struct WorldResource {
    pub world: World<Real>,
}

But all coordinates given to nphysics are globe-local, because (as far as I know?) nphysics doesn't use any kind of hierarchical coordinate system. (Trying to use some kind of universal coordinates in a solar system w