import type { vec2, vec3 } from '@predy-js/math';
import type { Camera } from './Camera';
export type Triangle = [p0: vec3, p1: vec3, p2: vec3];
export interface Ray {
    center: vec3;
    direction: vec3;
}
export declare function setRayFromCamera(x: number, y: number, camera: Camera): {
    center: vec3;
    direction: vec3;
};
export declare function intersectRaySphere(out: vec3 | number[], origin: vec3, direction: vec3, center: vec3, radius: number): vec3 | null;
export declare function intersectRayBox(out: vec3 | number[], origin: vec3, direction: vec3, center: vec3, size: vec3): vec3 | null;
export declare function trianglesFromRect(position: vec3, halfWidth: number, halfHeight: number): Triangle[];
export declare function intersectRayTriangle(out: vec3 | number[], origin: vec3, direction: vec3, triangle: Triangle, backfaceCulling?: boolean): vec3 | null;
export declare function dotInTriangle(out: boolean, dot: vec2, triangle: Triangle): boolean;