The following discussion from !3075 should be addressed: - [ ] @wenqing started a [discussion](https://gitlab.opengeosys.org/ogs/ogs/-/merge_requests/3075#note_82366): (+3 comments) > I see that MaterialID can be processed as mesh property. Then I suggest to remove mat_idx from NodeWiseMeshPartitioner.cpp as well: > 1. remove [this line](https://gitlab.opengeosys.org/endJunction/ogs/-/blob/MeshLibNodePartitionedMeshReaderWrongUsageFix/Applications/Utils/ModelPreparation/PartitionMesh/NodeWiseMeshPartitioner.cpp#L899) > 2. remove [this line](https://gitlab.opengeosys.org/endJunction/ogs/-/blob/MeshLibNodePartitionedMeshReaderWrongUsageFix/Applications/Utils/ModelPreparation/PartitionMesh/NodeWiseMeshPartitioner.cpp#L901) > 3. change `3*` to `2*` in [this line](https://gitlab.opengeosys.org/endJunction/ogs/-/blob/MeshLibNodePartitionedMeshReaderWrongUsageFix/Applications/Utils/ModelPreparation/PartitionMesh/NodeWiseMeshPartitioner.cpp#L83) > 4. remove `element ID, `, which should be `material ID, ` [ in this line](https://gitlab.opengeosys.org/endJunction/ogs/-/blob/MeshLibNodePartitionedMeshReaderWrongUsageFix/Applications/Utils/ModelPreparation/PartitionMesh/NodeWiseMeshPartitioner.cpp#L77) Decided to do the partmesh changes at once together with other possible changes in !3034 .