Apart from the "Dirty Broken Glass" shader, each material comes with 3 versions: DISP, TRANS and a "simple" one (DISP version: in case your shader uses a displacement map; TRANS version: for materials that use a transparency map).
Broken Dirty Glass: this shader features cracks, holes and an impact point. It simulates such things as a rock hitting a pane of glass. You can customize the position of the impact point, the size of the impact hole and the scale of the cracks.
Burnt: this shader features dark and desaturated parts where the mesh is exposed to the action of fire or smokes. You can customize the strength of the effect and its spreading as well.
Dirt: this shader scatters dirt across the mesh, with larger amount of dirt in the gaps and corners. you can customize the color of the dirt and how much the effect spreads.
Dust: this shader will add two sorts of dust layers on your mesh: one overall layer and one horizontal layer. You can customize the overall aging effect amount, the dust color and the strenght of this second effect.
Flood: This shader features traces left by the flood of dirty fluids. You can customize the color of the traces.
Rust: This shader adds rust to your metallic meshes. You can customize the color of the rust and how much the effect spreads.
Apart from the Broken Dirty Glass, all these shaders use a texture map. The pack includes a pdf doc that explains you how and where you have to load your own textures to make the shaders work properly.
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