playcanvas/build/playcanvas/src/framework/lightmapper/bake-light-ambient.js

PlayCanvas WebGL game engine

import { Vec3 } from '../../core/math/vec3.js';
import { random } from '../../core/math/random.js';
import { Color } from '../../core/math/color.js';
import { Entity } from '../entity.js';
import { SHADOW_PCF3_32F } from '../../scene/constants.js';
import { BakeLight } from './bake-light.js';

const _tempPoint = new Vec3();
class BakeLightAmbient extends BakeLight {
		constructor(lightmapper){
				const scene = lightmapper.scene;
				const lightEntity = new Entity('AmbientLight');
				lightEntity.addComponent('light', {
						type: 'directional',
						affectDynamic: true,
						affectLightmapped: false,
						bake: true,
						bakeNumSamples: scene.ambientBakeNumSamples,
						castShadows: true,
						normalOffsetBias: 0.05,
						shadowBias: 0.2,
						shadowDistance: 1,
						shadowResolution: 2048,
						shadowType: SHADOW_PCF3_32F,
						color: Color.WHITE,
						intensity: 1,
						bakeDir: false
				});
				super(scene, lightEntity.light.light, lightmapper.lightingParams);
		}
		get numVirtualLights() {
				return this.light.bakeNumSamples;
		}
		prepareVirtualLight(index, numVirtualLights) {
				random.spherePointDeterministic(_tempPoint, index, numVirtualLights, 0, this.scene.ambientBakeSpherePart);
				this.light._node.lookAt(_tempPoint.mulScalar(-1));
				this.light._node.rotateLocal(90, 0, 0);
				const gamma = 2.2;
				const fullIntensity = 2 * Math.PI * this.scene.ambientBakeSpherePart;
				const linearIntensity = Math.pow(fullIntensity, gamma);
				this.light.intensity = Math.pow(linearIntensity / numVirtualLights, 1 / gamma);
		}
}

export { BakeLightAmbient };