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/**
* @author alteredq / http://alteredqualia.com/
*
* Normal map shader
* - compute normals from heightmap
*/
import {
Vector2
} from "../../../build/three.module.js";
var NormalMapShader = {
uniforms: {
"heightMap": { value: null },
"resolution": { value: new Vector2( 512, 512 ) },
"scale": { value: new Vector2( 1, 1 ) },
"height": { 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" )
};
export { NormalMapShader };
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