NormalMapShader.js 1.0 KB

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  1. import {
  2. Vector2
  3. } from '../../../build/three.module.js';
  4. /**
  5. * Normal map shader
  6. * - compute normals from heightmap
  7. */
  8. var NormalMapShader = {
  9. uniforms: {
  10. 'heightMap': { value: null },
  11. 'resolution': { value: new Vector2( 512, 512 ) },
  12. 'scale': { value: new Vector2( 1, 1 ) },
  13. 'height': { value: 0.05 }
  14. },
  15. vertexShader: [
  16. 'varying vec2 vUv;',
  17. 'void main() {',
  18. ' vUv = uv;',
  19. ' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
  20. '}'
  21. ].join( '\n' ),
  22. fragmentShader: [
  23. 'uniform float height;',
  24. 'uniform vec2 resolution;',
  25. 'uniform sampler2D heightMap;',
  26. 'varying vec2 vUv;',
  27. 'void main() {',
  28. ' float val = texture2D( heightMap, vUv ).x;',
  29. ' float valU = texture2D( heightMap, vUv + vec2( 1.0 / resolution.x, 0.0 ) ).x;',
  30. ' float valV = texture2D( heightMap, vUv + vec2( 0.0, 1.0 / resolution.y ) ).x;',
  31. ' gl_FragColor = vec4( ( 0.5 * normalize( vec3( val - valU, val - valV, height ) ) + 0.5 ), 1.0 );',
  32. '}'
  33. ].join( '\n' )
  34. };
  35. export { NormalMapShader };