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Procedural texturing: Difference between revisions
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→The rock effect
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[[File:Rock-lichen.jpg|300px|Green overlay, small alpha, positive bias]] | [[File:Rock-lichen.jpg|300px|Green overlay, small alpha, positive bias]] | ||
[[File:Rock-crust.jpg|300px|White overlay, large alpha, negative bias]] | [[File:Rock-crust.jpg|300px|White overlay, large alpha, negative bias]] | ||
The crack layer is based on stretched Perlin noise isolines and controlled by the parameters | |||
<crack-depth type="float">0.9</crack-depth> | |||
<crack-pattern-stretch type="float">1.0</crack-pattern-stretch> | |||
The <crack-depth> (from 0 to 1) regulates how pronounced the darkening inside the crack region is whereas the <crack-pattern-stretch> (from 1 to roughly 10) controls the elongation of the crack pattern. | |||
For low stretch values, the crack layer can be used to draw bands of different mineral inside the rock, for high stretch values it can simukate a genuine pattern of cracks in the surface, see screenshots below for an illustration: | |||
[[File:Rock-crust.jpg|300px|No cracks]] | |||
[[File:Rock-crack1.jpg|300px|Stretch factor 1]] | |||
[[File:Rock-crack7.jpg|300px|Stretch factor 7]] | |||
=== Pixel color postprocessing === | === Pixel color postprocessing === | ||