import { Vector3D } from '@awayjs/core';
import { ShaderRegisterCache } from '@awayjs/stage';
import { ShaderBase, AnimationRegisterData } from '@awayjs/renderer';
import { ParticleBillboardState } from '../states/ParticleBillboardState';
import { ParticleAnimationSet } from '../ParticleAnimationSet';
import { AnimatorBase } from '../AnimatorBase';
import { ParticleNodeBase } from './ParticleNodeBase';
/**
 * A particle animation node that controls the rotation of a particle to always face the camera.
 */
export declare class ParticleBillboardNode extends ParticleNodeBase {
    /** @private */
    _iBillboardAxis: Vector3D;
    /**
     * Creates a new <code>ParticleBillboardNode</code>
     */
    constructor(billboardAxis?: Vector3D);
    /**
     * @inheritDoc
     */
    getAGALVertexCode(shader: ShaderBase, animationSet: ParticleAnimationSet, registerCache: ShaderRegisterCache, animationRegisterData: AnimationRegisterData): string;
    /**
     * @inheritDoc
     */
    getAnimationState(animator: AnimatorBase): ParticleBillboardState;
    /**
     * @inheritDoc
     */
    _iProcessAnimationSetting(particleAnimationSet: ParticleAnimationSet): void;
}
//# sourceMappingURL=ParticleBillboardNode.d.ts.map