RoF/Sandbox – User

Error: Layers generation - Bad texel mapping for surface mask image

This tends to be caused by your image files having the wrong image resolution for satellite / mask, compared to what you have in mapframe settings.

Open Terrain Builder and double click your project in the Mapframes panel. If you don't see Mapframes panel, make sure it's enabled in Window > Mapframe View.

In the Mapframe window, click the Samplers tab. Compare the size of the "Satellite / Surface (mask) source images" and make sure your images resolution matches it. For the best visual results in the game, the size should match the "Terrain Size".