The PolyVoxel frame contains options for exporting voxel cells as polyhedra, for CAE formats that support it.
When Export Voxels as Polyhedra is checked, the export process recombines the tetrahedra and pyramid cells used to transition between voxel sizes into polyhedra. Check Improve Face Orthogonality to also optionally offset the center nodes of the resultant polyhedra faces in order to improve face orthogonality. Improve Face Orthogonality is disabled if Export Voxels as Polyhedra is unchecked.