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

PlayCanvas WebGL game engine

import { Vec2 } from '../../core/math/vec2.js';
import { random } from '../../core/math/random.js';
import { LIGHTTYPE_DIRECTIONAL } from '../../scene/constants.js';
import { BakeLight } from './bake-light.js';

const _tempPoint = new Vec2();
class BakeLightSimple extends BakeLight {
		constructor(lightmapper, light){
				super(lightmapper.scene, light, lightmapper.lightingParams);
		}
		get numVirtualLights() {
				if (this.light.type === LIGHTTYPE_DIRECTIONAL) {
						return this.light.bakeNumSamples;
				}
				return 1;
		}
		prepareVirtualLight(index, numVirtualLights) {
				const light = this.light;
				light._node.setLocalRotation(this.rotation);
				if (index > 0) {
						const directionalSpreadAngle = light.bakeArea;
						random.circlePointDeterministic(_tempPoint, index, numVirtualLights);
						_tempPoint.mulScalar(directionalSpreadAngle * 0.5);
						light._node.rotateLocal(_tempPoint.x, 0, _tempPoint.y);
				}
				light._node.getWorldTransform();
				const gamma = 2.2;
				const linearIntensity = Math.pow(this.intensity, gamma);
				light.intensity = Math.pow(linearIntensity / numVirtualLights, 1 / gamma);
		}
}

export { BakeLightSimple };