75 lines
3.0 KiB
JavaScript
75 lines
3.0 KiB
JavaScript
"use strict";
|
|
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
|
|
const THREE = require("three");
|
|
class LightProbeHelper extends THREE.Mesh {
|
|
constructor(lightProbe, size) {
|
|
const material = new THREE.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 THREE.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;
|
|
}
|
|
}
|
|
exports.LightProbeHelper = LightProbeHelper;
|
|
//# sourceMappingURL=LightProbeHelper.cjs.map
|