import type { Box3Like } from './box3';
import type { Mat4Like, Vec3Like } from './types';
/**
 * Frustum storage: Float32Array(24) — 6 planes × 4 floats each (nx, ny, nz, d).
 * Local brand (not part of the seven-piece SSOT; same rationale as Box3).
 */
export type Frustum = Float32Array & {
    readonly __frustum: void;
};
/** Allocate a new Frustum (zero-initialized 6 planes). */
export declare function create(): Frustum;
/**
 * Extract 6 frustum planes (left, right, bottom, top, lower-Z, upper-Z) from a
 * combined WebGPU [0,1] view-projection matrix (column-major, right-handed).
 *
 * Uses Gribb/Hartmann method: each plane = sum or difference of VP rows,
 * then normalized so (nx, ny, nz) is a unit vector and d is the signed
 * distance from origin. Plane inside-half-space is nx*x + ny*y + nz*z + d > 0.
 *
 * Writes to `out` and returns it.
 *
 * @example
 * ```ts
 * const view = mat4.lookAt(mat4.create(), [0, 0, 5], [0, 0, 0], [0, 1, 0]);
 * const proj = mat4.perspective(mat4.create(), Math.PI / 2, 1, 0.1, 100);
 * const vp = mat4.create();
 * mat4.multiply(vp, proj, view);
 * const f = frustum.fromViewProjection(frustum.create(), vp);
 * ```
 */
export declare function fromViewProjection(out: Frustum, vp: Mat4Like): Frustum;
/**
 * Test whether an AABB intersects the frustum. Conservative: returns `true` when
 * the box straddles a plane boundary, even if partially outside.
 *
 * For each plane, the signed distance of both the positive-most corner (p-vertex)
 * and negative-most corner (n-vertex) are tested. The box is outside only when
 * the p-vertex is on the negative side of any plane.
 */
export declare function intersectsBox(f: Frustum, box: Box3Like): boolean;
/**
 * Test whether a sphere intersects the frustum. Conservative: returns `true`
 * when the sphere straddles a plane boundary.
 *
 * Computes signed distance from the sphere center to each plane;
 * outside when distance < -radius.
 */
export declare function intersectsSphere(f: Frustum, center: Vec3Like, radius: number): boolean;
//# sourceMappingURL=frustum.d.ts.map