webvr js meetup initial commit

node_modules/three/examples/js/shaders/FresnelShader.js

@@ -0,0 +1,74 @@
+/**
+ * @author alteredq / http://alteredqualia.com/
+ *
+ * Based on Nvidia Cg tutorial
+ */
+
+THREE.FresnelShader = {
+
+	uniforms: {
+
+		"mRefractionRatio": { value: 1.02 },
+		"mFresnelBias": { value: 0.1 },
+		"mFresnelPower": { value: 2.0 },
+		"mFresnelScale": { value: 1.0 },
+		"tCube": { value: null }
+
+	},
+
+	vertexShader: [
+
+		"uniform float mRefractionRatio;",
+		"uniform float mFresnelBias;",
+		"uniform float mFresnelScale;",
+		"uniform float mFresnelPower;",
+
+		"varying vec3 vReflect;",
+		"varying vec3 vRefract[3];",
+		"varying float vReflectionFactor;",
+
+		"void main() {",
+
+			"vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );",
+			"vec4 worldPosition = modelMatrix * vec4( position, 1.0 );",
+
+			"vec3 worldNormal = normalize( mat3( modelMatrix[0].xyz, modelMatrix[1].xyz, modelMatrix[2].xyz ) * normal );",
+
+			"vec3 I = worldPosition.xyz - cameraPosition;",
+
+			"vReflect = reflect( I, worldNormal );",
+			"vRefract[0] = refract( normalize( I ), worldNormal, mRefractionRatio );",
+			"vRefract[1] = refract( normalize( I ), worldNormal, mRefractionRatio * 0.99 );",
+			"vRefract[2] = refract( normalize( I ), worldNormal, mRefractionRatio * 0.98 );",
+			"vReflectionFactor = mFresnelBias + mFresnelScale * pow( 1.0 + dot( normalize( I ), worldNormal ), mFresnelPower );",
+
+			"gl_Position = projectionMatrix * mvPosition;",
+
+		"}"
+
+	].join( "\n" ),
+
+	fragmentShader: [
+
+		"uniform samplerCube tCube;",
+
+		"varying vec3 vReflect;",
+		"varying vec3 vRefract[3];",
+		"varying float vReflectionFactor;",
+
+		"void main() {",
+
+			"vec4 reflectedColor = textureCube( tCube, vec3( -vReflect.x, vReflect.yz ) );",
+			"vec4 refractedColor = vec4( 1.0 );",
+
+			"refractedColor.r = textureCube( tCube, vec3( -vRefract[0].x, vRefract[0].yz ) ).r;",
+			"refractedColor.g = textureCube( tCube, vec3( -vRefract[1].x, vRefract[1].yz ) ).g;",
+			"refractedColor.b = textureCube( tCube, vec3( -vRefract[2].x, vRefract[2].yz ) ).b;",
+
+			"gl_FragColor = mix( refractedColor, reflectedColor, clamp( vReflectionFactor, 0.0, 1.0 ) );",
+
+		"}"
+
+	].join( "\n" )
+
+};