Dirt Maps


A dirt map contains three textures. Each texture is a seperate greyscale texture saved in one RGB channel:

Combined RGB channels Red channel Green channel Blue channel

  • Red: Applies dirt effects while roads are dry.
  • Green: Decreases specularity while the car is dirty. By default it's a high contrast version of the red channel.
  • Blue: Applies dirt effects while roads are wet.

The diffuse will be applied as a brown overlay on top of the surface. Lighter areas on each channel will have a stronger effect, darker areas a weaker effect. Black will have no effect at all.

Mapping a dirt map

By default, the game uses one shared dirt map for all cars. Some mod authors also use custom dirt maps made for specific vehicles for better looking results.