Babylon.js/materialsLibrary/materials/pbr/babylon.sphericalpolynomial.ts

/// <reference path="../../../dist/preview release/babylon.d.ts"/>

module BABYLON {

    export class SphericalPolynomial {
        public x: Vector3 = Vector3.Zero();
        public y: Vector3 = Vector3.Zero();
        public z: Vector3 = Vector3.Zero();
        public xx: Vector3 = Vector3.Zero();
        public yy: Vector3 = Vector3.Zero();
        public zz: Vector3 = Vector3.Zero();
        public xy: Vector3 = Vector3.Zero();
        public yz: Vector3 = Vector3.Zero();
        public zx: Vector3 = Vector3.Zero();

        public addAmbient(color: Color3): void
        {
            var colorVector = new Vector3(color.r, color.g, color.b);
            this.xx = this.xx.add(colorVector);
            this.yy = this.yy.add(colorVector);
            this.zz = this.zz.add(colorVector);
        }

        public static getSphericalPolynomialFromHarmonics(harmonics: SphericalHarmonics): SphericalPolynomial 
        {
            var result = new SphericalPolynomial();

            result.x = harmonics.L11.scale(1.02333);
            result.y = harmonics.L1_1.scale(1.02333);
            result.z = harmonics.L10.scale(1.02333);

            result.xx = harmonics.L00.scale(0.886277).subtract(harmonics.L20.scale(0.247708)).add(harmonics.L22.scale(0.429043));
            result.yy = harmonics.L00.scale(0.886277).subtract(harmonics.L20.scale(0.247708)).subtract(harmonics.L22.scale(0.429043));
            result.zz = harmonics.L00.scale(0.886277).add(harmonics.L20.scale(0.495417));

            result.yz = harmonics.L2_1.scale(0.858086);
            result.zx = harmonics.L21.scale(0.858086);
            result.xy = harmonics.L2_2.scale(0.858086);

            return result;
        }
    }
}