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https://github.com/Doodle3D/Doodle3D-Slicer.git
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61 lines
1.1 KiB
JavaScript
61 lines
1.1 KiB
JavaScript
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/**
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* @author felixturner / http://airtight.cc/
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*
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* Kaleidoscope Shader
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* Radial reflection around center point
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* Ported from: http://pixelshaders.com/editor/
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* by Toby Schachman / http://tobyschachman.com/
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*
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* sides: number of reflections
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* angle: initial angle in radians
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*/
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THREE.KaleidoShader = {
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uniforms: {
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"tDiffuse": { type: "t", value: null },
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"sides": { type: "f", value: 6.0 },
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"angle": { type: "f", value: 0.0 }
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},
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vertexShader: [
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"varying vec2 vUv;",
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"void main() {",
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"vUv = uv;",
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"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
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"}"
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].join("\n"),
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fragmentShader: [
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"uniform sampler2D tDiffuse;",
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"uniform float sides;",
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"uniform float angle;",
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"varying vec2 vUv;",
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"void main() {",
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"vec2 p = vUv - 0.5;",
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"float r = length(p);",
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"float a = atan(p.y, p.x) + angle;",
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"float tau = 2. * 3.1416 ;",
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"a = mod(a, tau/sides);",
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"a = abs(a - tau/sides/2.) ;",
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"p = r * vec2(cos(a), sin(a));",
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"vec4 color = texture2D(tDiffuse, p + 0.5);",
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"gl_FragColor = color;",
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"}"
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].join("\n")
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};
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