/**
 * AnimationTransitions.ts
 *
 * Ragdoll ? Animation blending system.
 * Enables seamless transitions between physics-driven ragdoll and keyframed animation.
 *
 * @module animation
 */
export type IVector3 = [number, number, number];
export interface BonePose {
    boneId: string;
    position: IVector3;
    rotation: [number, number, number, number];
}
export interface TransitionConfig {
    duration: number;
    curve: 'linear' | 'ease_in' | 'ease_out' | 'ease_in_out';
    settleThreshold: number;
}
export type TransitionDirection = 'animation_to_ragdoll' | 'ragdoll_to_animation';
export interface BlendState {
    direction: TransitionDirection;
    progress: number;
    duration: number;
    sourcePose: BonePose[];
    isComplete: boolean;
}
export declare class AnimationTransitionSystem {
    private config;
    private activeBlends;
    constructor(config?: Partial<TransitionConfig>);
    /** Normalize position: supports [x,y,z] arrays and {x,y,z} objects */
    private toVec3;
    private toQuat4;
    private normalizePose;
    startAnimToRagdoll(entityId: string, currentPose: BonePose[]): void;
    startRagdollToAnim(entityId: string, currentPose: BonePose[]): void;
    update(dt: number, ragdollPoses: Map<string, BonePose[]>, animPoses: Map<string, BonePose[]>): Map<string, BonePose[]>;
    isTransitioning(entityId: string): boolean;
    getBlendProgress(entityId: string): number;
    clearTransition(entityId: string): void;
    getActiveTransitionCount(): number;
    private applyCurve;
    private lerpVec3;
    /**
     * Normalized-lerp (NLERP) of two quaternions with shortest-arc correction.
     *
     * This is NLERP by design, not SLERP: it linearly blends the components (after a
     * double-cover sign flip when dot < 0) and renormalizes. NLERP traces the same arc
     * as SLERP at a fraction of the cost and is the correct choice for short ragdoll↔anim
     * transition blends, where SLERP's constant-angular-velocity property is not visible.
     * (Previously named `slerpQuat`, which was a misnomer — true SLERP lives in
     * `@holoscript/core` `Quaternion.slerp`.)
     */
    private nlerpQuat;
}
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