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61 lines
1.5 KiB
Markdown
61 lines
1.5 KiB
Markdown
# nz_perlin3s
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Returns 3D [Perlin noise](https://en.wikipedia.org/wiki/Perlin_noise) values at (x, y, z) coordinates.
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**Since:** 2.3
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## Parameters
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- `points` : A list of `[x, y, z]` coordinates.
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- `seed` : The random seed. If it's ignored, a randomized value will be used.
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## Examples
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use <util/rand.scad>;
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use <noise/nz_perlin2s.scad>;
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use <noise/nz_perlin3s.scad>;
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points = [
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for(y = [0:.2:10])
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[
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for(x = [0:.2:10])
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[x, y]
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]
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];
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seed = rand(0, 256);
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points_with_h = [
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for(ri = [0:len(points) - 1])
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let(ns = nz_perlin2s(points[ri], seed))
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[
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for(ci = [0:len(ns) - 1])
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[points[ri][ci][0], points[ri][ci][1], ns[ci] + 1]
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]
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];
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h_scale = 1.5;
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for(row = points_with_h) {
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for(i = [0:len(row) - 1]) {
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p = row[i];
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pts = [
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for(z = [0:.2:p[2] * h_scale]) [p.x, p.y, z]
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];
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noise = nz_perlin3s(pts, seed);
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for(j = [0:len(pts) - 1]) {
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if(noise[j] > 0) {
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color(
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pts[j][2] < 1 ? "green" :
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pts[j][2] < 1.5 ? "Olive" : "white")
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translate(pts[j])
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cube(.2);
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}
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}
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}
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}
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color("LimeGreen")
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linear_extrude(.2)
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square(10);
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