webvr js meetup initial commit

node_modules/three/examples/js/shaders/KaleidoShader.js

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+/**
+ * @author felixturner / http://airtight.cc/
+ *
+ * Kaleidoscope Shader
+ * Radial reflection around center point
+ * Ported from: http://pixelshaders.com/editor/
+ * by Toby Schachman / http://tobyschachman.com/
+ *
+ * sides: number of reflections
+ * angle: initial angle in radians
+ */
+
+THREE.KaleidoShader = {
+
+	uniforms: {
+
+		"tDiffuse": { value: null },
+		"sides":    { value: 6.0 },
+		"angle":    { value: 0.0 }
+
+	},
+
+	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" )
+
+};