How To make This Effect

[Andrew W]

I'd suggest breaking your problem down into small solvable bits like this.

1) Make maps to do the dirt areas, both colour and mattes.
2) Make a shader that mimics the dirt effect, matte, Oren-Nayer type.
3) Make glass shader, probably with softer than normal spec as it's weathered glass.
4) Any other maps, layers of gunge etc, as both shaders and maps.
5) Layer 'em up.

Divide and conquer! Always the best problem solving technique.

Andrew

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