Is it possible to change the background texture behind the track and make it grass/mud/ice as needed. The image below is with photoshop to understand what i mean.



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That's not possible. What you can do is change the various shades of (light) blue via palette editor. However, the "texture" remains the same.

I not mistaken the makers of Generally2 will fix some small issues with Generally.

Do not know what work does this feature involve but would be interesting to have, so that tracks look more realistic.