Doodle3D-Slicer/three.js-master/examples/js/shaders/NormalMapShader.js
2015-06-12 15:58:26 +02:00

54 lines
1.0 KiB
JavaScript
Executable File

/**
* @author alteredq / http://alteredqualia.com/
*
* Normal map shader
* - compute normals from heightmap
*/
THREE.NormalMapShader = {
uniforms: {
"heightMap": { type: "t", value: null },
"resolution": { type: "v2", value: new THREE.Vector2( 512, 512 ) },
"scale": { type: "v2", value: new THREE.Vector2( 1, 1 ) },
"height": { type: "f", value: 0.05 }
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
"vUv = uv;",
"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join("\n"),
fragmentShader: [
"uniform float height;",
"uniform vec2 resolution;",
"uniform sampler2D heightMap;",
"varying vec2 vUv;",
"void main() {",
"float val = texture2D( heightMap, vUv ).x;",
"float valU = texture2D( heightMap, vUv + vec2( 1.0 / resolution.x, 0.0 ) ).x;",
"float valV = texture2D( heightMap, vUv + vec2( 0.0, 1.0 / resolution.y ) ).x;",
"gl_FragColor = vec4( ( 0.5 * normalize( vec3( val - valU, val - valV, height ) ) + 0.5 ), 1.0 );",
"}"
].join("\n")
};