Jerry
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
const GLSL = `
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const float IMPLICIT_MOBIUS_TAU = 6.283185307179586;
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float sdf(vec3 p) {
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float u = atan(p.y, p.x);
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vec2 section = vec2(length(p.xy) - radius, p.z);
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vec2 twistAxis = vec2(cos(0.5 * u), sin(0.5 * u));
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vec2 closest = twistAxis * clamp(dot(section, twistAxis), -(width * 0.5), (width * 0.5));
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return length(section - closest) - thickness;
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}
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vec3 implicit_palette(float t) {
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return 0.58 + 0.42 * cos(6.283185307179586 * (vec3(0.02, 0.38, 0.72) + t));
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}
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vec3 color(vec3 p, vec3 normal) {
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vec2 ring = vec2(p.x, p.y);
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float angle = atan(ring.y, ring.x) / 6.283185307179586;
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vec3 bandColor = implicit_palette(angle + p.z * 0.035);
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return mix(bandColor, vec3(1.0, 0.84, 0.48), smoothstep(0.25, 0.95, abs(normal.z)) * 0.28);
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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: "mobius strip",
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units: "mm",
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params: {
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radius: { type: "number", label: "Radius", min: 14, max: 34, step: 0.25, default: 24, unit: "mm" },
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width: { type: "number", label: "Band width", min: 4, max: 22, step: 0.25, default: 13.6, unit: "mm" },
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thickness: { type: "number", label: "Thickness", min: 0.25, max: 2.5, step: 0.05, default: 0.82, unit: "mm" }
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},
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animations: {
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bandBreath: {
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label: "Band breath",
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duration: 4.8,
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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("width", 13.6 + wave * 5.5);
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set("thickness", 0.82 + wave * 0.35);
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set("radius", 24 + wave * 4);
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}
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}
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},
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bounds: ({ params }) => {
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const halfWidth = params.width * 0.5;
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const radialExtent = params.radius + halfWidth + params.thickness + 6;
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const heightExtent = halfWidth + params.thickness + 6;
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return [[-radialExtent, -radialExtent, -heightExtent], [radialExtent, radialExtent, heightExtent]];
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},
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render: ({ params }) => ({
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steps: 192,
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stepScale: 0.72,
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maxStep: Math.max(params.thickness * 3.8, 1.4),
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epsilon: Math.max(params.thickness * 0.012, 0.006),
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normalEpsilon: Math.max(params.thickness * 0.075, 0.04)
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}),
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glsl: GLSL
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};
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