three-stdlib/shaders/KaleidoShader.js

stand-alone library of threejs examples

const KaleidoShader = {
  uniforms: {
    tDiffuse: { value: null },
    sides: { value: 6 },
    angle: { value: 0 }
  },
  vertexShader: [
    "varying vec2 vUv;",
    "void main() {",
    "	vUv = uv;",
    "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
    "}"
  ].join("\n"),
  fragmentShader: [
    "uniform sampler2D tDiffuse;",
    "uniform float sides;",
    "uniform float angle;",
    "varying vec2 vUv;",
    "void main() {",
    "	vec2 p = vUv - 0.5;",
    "	float r = length(p);",
    "	float a = atan(p.y, p.x) + angle;",
    "	float tau = 2. * 3.1416 ;",
    "	a = mod(a, tau/sides);",
    "	a = abs(a - tau/sides/2.) ;",
    "	p = r * vec2(cos(a), sin(a));",
    "	vec4 color = texture2D(tDiffuse, p + 0.5);",
    "	gl_FragColor = color;",
    "}"
  ].join("\n")
};
export {
  KaleidoShader
};
//# sourceMappingURL=KaleidoShader.js.map