/**
 * BoneSystem.ts
 *
 * Skeletal bone hierarchy: bind pose, joint transforms,
 * world-space chain computation, and pose application.
 *
 * @module animation
 */
/** Local tuple for bone world positions — keeps BoneSystem independent of @holoscript/core object-style Vector3. */
type Vec3 = [number, number, number];
export interface BoneTransform {
    tx: number;
    ty: number;
    tz: number;
    rx: number;
    ry: number;
    rz: number;
    rw: number;
    sx: number;
    sy: number;
    sz: number;
}
export interface Bone {
    id: string;
    name: string;
    parentId: string | null;
    local: BoneTransform;
    world: BoneTransform;
    bindInverse: BoneTransform;
    childIds: string[];
}
export declare class BoneSystem {
    private bones;
    private roots;
    private dirty;
    addBone(id: string, name: string, parentId: string | null, local?: Partial<BoneTransform>): void;
    getBone(id: string): Bone | undefined;
    getBoneCount(): number;
    getRoots(): string[];
    setLocalTransform(id: string, transform: Partial<BoneTransform>): void;
    /**
     * Apply a batch of local transforms and update the hierarchy as one
     * transaction. A validation/composition failure restores both local and
     * world state so callers never observe a half-applied pose.
     */
    applyLocalTransforms(transforms: ReadonlyMap<string, Partial<BoneTransform>>): void;
    updateWorldTransforms(): void;
    private updateBoneChain;
    captureBindPose(): void;
    getSkinningMatrix(id: string): BoneTransform | null;
    private combineTransforms;
    private invertTransform;
    private normalizeTransformRotation;
    private normalizeQuaternion;
    private multiplyQuaternions;
    private rotateVector;
    getWorldPosition(id: string): Vec3 | null;
    getChain(leafId: string): string[];
}
export {};
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