# Custom Tile Requirements

You can model your own tile and use it in the [Roof Tiles Generator](https://blendermarket.com/products/roof-tiles-generator). There are some requirements for the model:

* Tile model should be [manifold](https://docs.blender.org/manual/en/latest/glossary/index.html#term-Manifold). A manifold mesh is a mesh in which the structure of the connected faces in a closed volume will always point the normals (and their surfaces) to the outside or to the inside of the mesh without any overlaps.
* It is recommended to place tile the way it "lies" on **XY plane** (horizontal) and its length is along Y axis.
* Tile model should be unwrapped manualy and the **UV Map** name should be "*uvmap*".
* Make sure **Scale** and **Rotation** transforms are applied.

**Keep in mind!** Higher density of the mesh - more time it takes for Geometry Node to calculate and build the roof. It is recommended to keep the tile mesh as low poly as possible.

If performalnce is low - **convert** roof with Geometry Node modifier to mesh when you are happy with the result.

If you want to change the shape of the roof - **switch off** Geometry Node Modifier for the viewport.


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