When converting a multi-mesh structure into a volume, voxelize each mesh directly onto a shared grid instead of voxelizing each component separately and re-rasterizing onto a shared grid. This makes voxelization faster and more accurate.
Also add a from_meshes classmethod to the Volume class to create multi-mesh volumes for cases when the file structure for creating instruments is not desired.
When converting a multi-mesh structure into a volume, voxelize each mesh directly onto a shared grid instead of voxelizing each component separately and re-rasterizing onto a shared grid. This makes voxelization faster and more accurate.
Also add a from_meshes classmethod to the Volume class to create multi-mesh volumes for cases when the file structure for creating instruments is not desired.