import { TextureBase } from '@awayjs/renderer';
import { EffectEnvMapMethod, _Shader_EffectEnvMapMethod } from './EffectEnvMapMethod';
/**
 * EffectFresnelEnvMapMethod provides a method to add fresnel-based reflectivity to an object using cube maps, which gets
 * stronger as the viewing angle becomes more grazing.
 */
export declare class EffectFresnelEnvMapMethod extends EffectEnvMapMethod {
    private _fresnelPower;
    private _normalReflectance;
    static assetType: string;
    /**
     * @inheritDoc
     */
    get assetType(): string;
    /**
     * The power used in the Fresnel equation. Higher values make the fresnel effect more pronounced. Defaults to 5.
     */
    get fresnelPower(): number;
    set fresnelPower(value: number);
    /**
     * The minimum amount of reflectance, ie the reflectance when the view direction is normal to the surface or light direction.
     */
    get normalReflectance(): number;
    set normalReflectance(value: number);
    /**
     * Creates a new <code>EffectFresnelEnvMapMethod</code> object.
     *
     * @param envMap The environment map containing the reflected scene.
     * @param alpha The reflectivity of the material.
     */
    constructor(envMap: TextureBase, alpha?: number, fresnelPower?: number, normalReflectance?: number);
}
import { ShaderRegisterCache, ShaderRegisterData, ShaderRegisterElement } from '@awayjs/stage';
/**
 * _Shader_EffectFresnelEnvMapMethod provides a method to add fresnel-based reflectivity to an object using cube maps, which gets
 * stronger as the viewing angle becomes more grazing.
 */
export declare class _Shader_EffectFresnelEnvMapMethod extends _Shader_EffectEnvMapMethod {
    /**
     * @inheritDoc
     */
    _getFragmentCode(targetReg: ShaderRegisterElement, registerCache: ShaderRegisterCache, sharedRegisters: ShaderRegisterData): string;
    protected _updateProperties(): void;
}
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