import type { HyperplaneSlice4 } from '../projection/slice.js';
import type { Point3 } from './sample.js';
import type { FieldEvaluation4, ImplicitField4, Vec4f64 } from './types.js';
export interface TraceFieldSliceRay3Options {
    /** Half-width of the axis-aligned trace box in slice coordinates. Default 1.65. */
    extent?: number;
    /** Maximum conservative-advancement steps. Default 112. */
    maxSteps?: number;
    /** Surface hit threshold in slice coordinates. Default 0.0015. */
    surfaceEpsilon?: number;
    /** Finite-difference step for the slice-space normal. Default 0.004. */
    normalEpsilon?: number;
    /** Defaults to the field's declared distance-estimator recommendation. */
    stepSafety?: number;
}
export interface FieldSliceRayHit3<Record extends FieldEvaluation4 = FieldEvaluation4> {
    readonly hit: true;
    readonly position: Point3;
    readonly point4: Vec4f64;
    /** Unit slice-space normal, oriented against the incoming ray. */
    readonly normal: Point3;
    readonly distance: number;
    readonly steps: number;
    /** True when the first in-box evaluation was already classified inside. */
    readonly startedInside: boolean;
    readonly record: Record;
}
export interface FieldSliceRayMiss3 {
    readonly hit: false;
    readonly reason: 'box' | 'bounds' | 'steps';
    readonly steps: number;
}
export type FieldSliceRayResult3<Record extends FieldEvaluation4 = FieldEvaluation4> = FieldSliceRayHit3<Record> | FieldSliceRayMiss3;
/**
 * Deterministic CPU reference for the same affine-slice sphere tracing used by
 * `RaymarchedField3D`. It supports headless inspection and renderer picking.
 *
 * The distance channel is assumed conservative under `stepSafety`. Fields
 * without a declared estimator must provide that option explicitly.
 */
export declare function traceFieldSliceRay3<Record extends FieldEvaluation4>(field: ImplicitField4<Record>, slice: HyperplaneSlice4, originValue: ArrayLike<number>, directionValue: ArrayLike<number>, options?: TraceFieldSliceRay3Options): FieldSliceRayResult3<Record>;
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