import { Animation } from './animation';
import { Animator } from './animator';
import { Vector3 } from '../modeling/transform';
/**
 * Advanced animation operations and utilities
 */
/**
 * Interpolation types
 */
export declare const InterpolationType: {
    readonly LINEAR: "linear";
    readonly STEP: "step";
    readonly BEZIER: "bezier";
    readonly CATMULLROM: "catmullrom";
};
export type InterpolationType = typeof InterpolationType[keyof typeof InterpolationType];
/**
 * Evaluate animation at a specific time
 * Returns the interpolated values for all channels
 */
export declare function evaluateAnimation(animation: Animation, time: number, options?: {
    loop?: boolean;
    channels?: string[];
}): Record<string, Record<string, Vector3>>;
/**
 * Interpolate a specific channel at a given time
 */
export declare function interpolateChannel(animator: Animator, channel: string, time: number): Vector3 | null;
/**
 * Blend two animations together
 */
export declare function blendAnimations(animation1: Animation, animation2: Animation, blendFactor: number, // 0 = animation1, 1 = animation2
time: number): Record<string, Record<string, Vector3>>;
/**
 * Optimize keyframes by removing redundant ones
 */
export declare function optimizeKeyframes(animator: Animator, channel: string, threshold?: number): number;
/**
 * Create animation from keyframe data
 */
export declare function createAnimationFromKeyframes(name: string, keyframeData: Array<{
    animatorKey: string;
    channel: string;
    time: number;
    value: Vector3;
    interpolation?: InterpolationType;
}>, length?: number): Animation;
/**
 * Extract animation segment (time range)
 */
export declare function extractAnimationSegment(animation: Animation, startTime: number, endTime: number): Animation;
/**
 * Reverse animation
 */
export declare function reverseAnimation(animation: Animation): Animation;
/**
 * Scale animation speed (time stretch/compress)
 */
export declare function scaleAnimationSpeed(animation: Animation, speedFactor: number): Animation;
/**
 * Get animation duration (actual length based on keyframes)
 */
export declare function getAnimationDuration(animation: Animation): number;
/**
 * Merge multiple animations into one
 */
export declare function mergeAnimations(animations: Animation[], options?: {
    offsetTime?: boolean;
    blendOverlap?: boolean;
}): Animation;
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