Cleanup Unused Meshes - rotorz/unity3d-tile-system GitHub Wiki
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Each non-procedural tileset brush is accompanied by a pre-generated mesh asset. These mesh assets can be removed using the cleanup command when they are not referenced by any tileset brushes.
If you have switched tileset brushes from non-procedural to procedural then any tiles that were painted prior will be affected when the 'unused' mesh assets are removed. Such tiles should be refreshed so that they are replaced with procedural tiles instead.
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Select tileset using Brush palette and select menu command img/context-button.png | Show in Designer....
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Select menu command
| Cleanup Meshes....
The following confirmation window should appear:
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Click Cleanup.
Source: topics/Cleanup-Unused-Meshes.md