import { Texture } from '@pixi/core';
/**
 * https://learnopengl.com/PBR/IBL/Specular-IBL
 *
 * Epic Games stores the pre-computed BRDF's response to each normal and light direction combination on varying roughness values in a 2D lookup texture (LUT)
 * known as the BRDF integration map. The 2D lookup texture outputs a scale (red) and a bias value (green) to the surface's Fresnel response giving us the second part of the split specular integral:
 */
export declare function getBrdfLUT(): Texture;
//# sourceMappingURL=brdfLUT.d.ts.map