import { Plane } from "./Plane.ts";
/** Six-plane view frustum for visibility culling. */
export declare class Frustum {
    /** 0: left, 1: right, 2: bottom, 3: top, 4: near, 5: far */
    planes: Plane[];
    constructor();
    clone(): Frustum;
    containsPoint(point: {
        x: number;
        y: number;
        z: number;
    }): boolean;
    copy(frustum: Frustum): this;
    intersectsBox(box: {
        min: {
            x: number;
            y: number;
            z: number;
        };
        max: {
            x: number;
            y: number;
            z: number;
        };
    }): boolean;
    intersectsSphere(sphere: {
        centre: {
            x: number;
            y: number;
            z: number;
        };
        radius: number;
    }): boolean;
    makeEmpty(): this;
    /**
     * Extracts the six frustum planes from a combined projection matrix.
     * Uses the Gribb/Hartmann method (column-major layout).
     */
    setFromProjectionMatrix(m: {
        elements: ArrayLike<number>;
    }): this;
}
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