/**
 * SoftBodyGrabController
 *
 * Bridges the @grabbable trait to PBD attachment constraints.
 * When a hand grabs a soft body, finds the closest vertices within
 * a grab radius, creates attachment constraints with distance-weighted
 * compliance, and updates their targets each frame as the hand moves.
 */
import type { IVector3 } from './PhysicsTypes';
import type { PBDSolverCPU } from './PBDSolver';
export interface GrabConfig {
    /** Maximum number of vertices to grab */
    maxVertices: number;
    /** Grab radius around the hand position */
    grabRadius: number;
    /** Base compliance for attachment (0 = hard, higher = softer) */
    baseCompliance: number;
    /** Compliance scales with distance: compliance = base * (1 + dist/radius * falloff) */
    complianceFalloff: number;
}
export declare class SoftBodyGrabController {
    private activeGrabs;
    private config;
    constructor(config?: Partial<GrabConfig>);
    /**
     * Start grabbing the soft body at the given hand position.
     * Finds the closest vertices and creates attachment constraints.
     */
    grabStart(handId: string, handPosition: IVector3, solver: PBDSolverCPU): void;
    /**
     * Update grab target positions as the hand moves.
     * Each grabbed vertex follows the hand with its original local offset preserved.
     */
    grabUpdate(handId: string, handPosition: IVector3): void;
    /**
     * Release the grab — remove all attachment constraints for this hand.
     */
    grabEnd(handId: string): void;
    /**
     * Check if a hand is currently grabbing.
     */
    isGrabbing(handId: string): boolean;
    /**
     * Get all active grab hand IDs.
     */
    getActiveGrabs(): string[];
    /**
     * Release all grabs (e.g., when soft body is destroyed).
     */
    releaseAll(): void;
}
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