import { VecN } from '@holotope/core';
export interface DistanceCoordinateEvaluationN {
    /** `anchorA - anchorB`. */
    readonly delta: VecN;
    /** Unit gradient of distance with respect to anchor A. */
    readonly direction: VecN;
    readonly distance: number;
}
export interface DistanceConstraintEvaluationN extends DistanceCoordinateEvaluationN {
    /** Signed constraint value `distance - restLength`. */
    readonly error: number;
}
/** Dimension-independent distance and gradient between two anchors. */
export declare function evaluateDistanceCoordinateN(anchorA: VecN, anchorB: VecN, directionHint?: VecN): DistanceCoordinateEvaluationN;
/** Dimension-independent positive-length distance equality geometry. */
export declare function evaluateDistanceConstraintN(anchorA: VecN, anchorB: VecN, restLength: number, directionHint?: VecN): DistanceConstraintEvaluationN;
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