backend/libs/three/math/SphericalHarmonics3.d.ts

import { Vector3 } from './Vector3';

export class SphericalHarmonics3 {
	constructor();

	/**
	 * @default [new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3(),
	 * new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3()]
	 */
	coefficients: Vector3[];
	readonly isSphericalHarmonics3: true;

	set(coefficients: Vector3[]): SphericalHarmonics3;
	zero(): SphericalHarmonics3;
	add(sh: SphericalHarmonics3): SphericalHarmonics3;
	addScaledSH(sh: SphericalHarmonics3, s: number): SphericalHarmonics3;
	scale(s: number): SphericalHarmonics3;
	lerp(sh: SphericalHarmonics3, alpha: number): SphericalHarmonics3;
	equals(sh: SphericalHarmonics3): boolean;
	copy(sh: SphericalHarmonics3): SphericalHarmonics3;
	clone(): this;

	/**
	 * Sets the values of this spherical harmonics from the provided array or array-like.
	 * @param array the source array or array-like.
	 * @param offset (optional) offset into the array. Default is 0.
	 */
	fromArray(array: number[] | ArrayLike<number>, offset?: number): this;

	/**
	 * Returns an array with the values of this spherical harmonics, or copies them into the provided array.
	 * @param array (optional) array to store the spherical harmonics to. If this is not provided, a new array will be created.
	 * @param offset (optional) optional offset into the array.
	 * @return The created or provided array.
	 */
	toArray(array?: number[], offset?: number): number[];

	/**
	 * Returns an array with the values of this spherical harmonics, or copies them into the provided array-like.
	 * @param array array-like to store the spherical harmonics to.
	 * @param offset (optional) optional offset into the array-like.
	 * @return The provided array-like.
	 */
	toArray(array: ArrayLike<number>, offset?: number): ArrayLike<number>;

	getAt(normal: Vector3, target: Vector3): Vector3;
	getIrradianceAt(normal: Vector3, target: Vector3): Vector3;

	static getBasisAt(normal: Vector3, shBasis: number[]): void;
}