You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
2.8 KiB
130 lines
2.8 KiB
import {
|
|
Mesh,
|
|
ShaderMaterial,
|
|
SphereGeometry
|
|
} from '../../../build/three.module.js';
|
|
|
|
class LightProbeHelper extends Mesh {
|
|
|
|
constructor( lightProbe, size ) {
|
|
|
|
const material = new ShaderMaterial( {
|
|
|
|
type: 'LightProbeHelperMaterial',
|
|
|
|
uniforms: {
|
|
|
|
sh: { value: lightProbe.sh.coefficients }, // by reference
|
|
|
|
intensity: { value: lightProbe.intensity }
|
|
|
|
},
|
|
|
|
vertexShader: [
|
|
|
|
'varying vec3 vNormal;',
|
|
|
|
'void main() {',
|
|
|
|
' vNormal = normalize( normalMatrix * normal );',
|
|
|
|
' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
|
|
|
|
'}',
|
|
|
|
].join( '\n' ),
|
|
|
|
fragmentShader: [
|
|
|
|
'#define RECIPROCAL_PI 0.318309886',
|
|
|
|
'vec3 inverseTransformDirection( in vec3 normal, in mat4 matrix ) {',
|
|
|
|
' // matrix is assumed to be orthogonal',
|
|
|
|
' return normalize( ( vec4( normal, 0.0 ) * matrix ).xyz );',
|
|
|
|
'}',
|
|
|
|
'// source: https://graphics.stanford.edu/papers/envmap/envmap.pdf',
|
|
'vec3 shGetIrradianceAt( in vec3 normal, in vec3 shCoefficients[ 9 ] ) {',
|
|
|
|
' // normal is assumed to have unit length',
|
|
|
|
' float x = normal.x, y = normal.y, z = normal.z;',
|
|
|
|
' // band 0',
|
|
' vec3 result = shCoefficients[ 0 ] * 0.886227;',
|
|
|
|
' // band 1',
|
|
' result += shCoefficients[ 1 ] * 2.0 * 0.511664 * y;',
|
|
' result += shCoefficients[ 2 ] * 2.0 * 0.511664 * z;',
|
|
' result += shCoefficients[ 3 ] * 2.0 * 0.511664 * x;',
|
|
|
|
' // band 2',
|
|
' result += shCoefficients[ 4 ] * 2.0 * 0.429043 * x * y;',
|
|
' result += shCoefficients[ 5 ] * 2.0 * 0.429043 * y * z;',
|
|
' result += shCoefficients[ 6 ] * ( 0.743125 * z * z - 0.247708 );',
|
|
' result += shCoefficients[ 7 ] * 2.0 * 0.429043 * x * z;',
|
|
' result += shCoefficients[ 8 ] * 0.429043 * ( x * x - y * y );',
|
|
|
|
' return result;',
|
|
|
|
'}',
|
|
|
|
'uniform vec3 sh[ 9 ]; // sh coefficients',
|
|
|
|
'uniform float intensity; // light probe intensity',
|
|
|
|
'varying vec3 vNormal;',
|
|
|
|
'void main() {',
|
|
|
|
' vec3 normal = normalize( vNormal );',
|
|
|
|
' vec3 worldNormal = inverseTransformDirection( normal, viewMatrix );',
|
|
|
|
' vec3 irradiance = shGetIrradianceAt( worldNormal, sh );',
|
|
|
|
' vec3 outgoingLight = RECIPROCAL_PI * irradiance * intensity;',
|
|
|
|
' gl_FragColor = linearToOutputTexel( vec4( outgoingLight, 1.0 ) );',
|
|
|
|
'}'
|
|
|
|
].join( '\n' )
|
|
|
|
} );
|
|
|
|
const geometry = new SphereGeometry( 1, 32, 16 );
|
|
|
|
super( geometry, material );
|
|
|
|
this.lightProbe = lightProbe;
|
|
this.size = size;
|
|
this.type = 'LightProbeHelper';
|
|
|
|
this.onBeforeRender();
|
|
|
|
}
|
|
|
|
dispose() {
|
|
|
|
this.geometry.dispose();
|
|
this.material.dispose();
|
|
|
|
}
|
|
|
|
onBeforeRender() {
|
|
|
|
this.position.copy( this.lightProbe.position );
|
|
|
|
this.scale.set( 1, 1, 1 ).multiplyScalar( this.size );
|
|
|
|
this.material.uniforms.intensity.value = this.lightProbe.intensity;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
export { LightProbeHelper };
|
|
|