Jerry
71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
const GLSL = `
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float sdBox(vec3 p, vec3 b) {
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vec3 q = abs(p) - b;
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return length(max(q, 0.0)) + min(max(q.x, max(q.y, q.z)), 0.0);
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}
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float menger(vec3 p) {
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vec3 q = p / size;
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float d = sdBox(q, vec3(1.0));
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float scale = 1.0;
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for (int i = 0; i < 4; i += 1) {
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if (float(i) < levels) {
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vec3 a = mod(q * scale + 1.0, 2.0) - 1.0;
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scale *= 3.0;
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vec3 r = abs(1.0 - 3.0 * abs(a));
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float cross = min(max(r.x, r.y), min(max(r.y, r.z), max(r.z, r.x))) / scale;
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d = max(d, cross);
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}
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}
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return d * size - bevel;
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}
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float sdf(vec3 p) {
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return menger(p);
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}
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vec3 color(vec3 p, vec3 normal) {
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float cavities = 0.5 + 0.5 * sin((abs(p.x) + abs(p.y) + abs(p.z)) * 0.34);
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vec3 c = mix(baseColor, accentColor, cavities);
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return c * (0.55 + 0.45 * pow(max(dot(normal, normalize(vec3(0.45, 0.36, 0.82))), 0.0), 1.8));
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}
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`;
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export default {
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schema: "implicit.js/0.1.0",
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name: "Menger sponge",
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description: "A recursive cubic sponge with orthogonal voids and softened printable interior edges.",
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units: "mm",
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params: {
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size: { type: "number", label: "Half size", min: 12, max: 34, step: 0.5, default: 24, unit: "mm" },
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levels: { type: "number", label: "Levels", min: 1, max: 4, step: 1, default: 3 },
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bevel: { type: "number", label: "Edge soften", min: 0.05, max: 1.4, step: 0.05, default: 0.34, unit: "mm" },
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baseColor: { type: "color", label: "Outer color", default: "#b8c0ff" },
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accentColor: { type: "color", label: "Void color", default: "#2df5ff" }
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},
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animations: {
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voidBreath: {
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label: "Void breath",
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duration: 5.5,
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loop: true,
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update({ progress, set }) {
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const wave = Math.sin(progress * Math.PI * 2);
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set("bevel", 0.34 + (wave * 0.5 + 0.5) * 0.55);
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set("size", 24 + wave * 3.0);
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}
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}
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},
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bounds: ({ params }) => {
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const extent = params.size + params.bevel + 5;
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return [[-extent, -extent, -extent], [extent, extent, extent]];
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},
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render: ({ params }) => ({
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steps: 260,
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stepScale: 0.62,
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maxStep: Math.max(params.bevel * 5, 1.0),
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epsilon: Math.max(params.bevel * 0.015, 0.004),
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normalEpsilon: Math.max(params.bevel * 0.12, 0.036)
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}),
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glsl: GLSL
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};
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