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slawo-ch/plasma_height_map2.js

Created December 23, 2019 09:36
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plasma_height_map2.js
const heightMap2 = [];
for (let u = 0; u < mapSize; u++) {
for (let v = 0; v < mapSize; v++) {
const i = u * mapSize + v;
const cx = u - mapSize / 2;
const cy = v - mapSize / 2;
// skewed distance as input to chaos field calculation,
// scaled for smoothness over map distance
const d1 = distance(0.8 * cx, 1.3 * cy) * 0.022;
const d2 = distance(1.35 * cx, 0.45 * cy) * 0.022;
const s = Math.sin(d1);
const c = Math.cos(d2);
// height value between -2 and +2
const h = s + c;
// height value between 0..1
const normalized = (h + 2) / 4;
// height value between 0..127, integer
heightMap2[i] = Math.floor(normalized * 127);
}
}
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