Investigate any differences between `warp_deform_3d` and `warp_mesh_mat`

[Algomorph]

Seems like NNRT guys used the warp_deform_3d function to apply node transformations to points from the input point-cloud. Perhaps there is some subtle difference between how they're doing that and how we're transforming voxel centers. This can be tested on the warp_mesh_mat method first.