import { type Vec3, FACE } from "../utils/math.ts";
export declare const FACE_NORMALS: readonly Vec3[];
export declare const FACE_OFFSETS: readonly Vec3[];
export declare const FACE_OPPOSITE: readonly FACE[];
/**
 * Rotates a vertex position (in 0-1 block space) around the block center (0.5, 0.5, 0.5)
 * applying a Y-axis rotation and optional mirror flips.
 */
export declare function rotateVertex(vec3: Vec3, rotation: number, flip: {
    x: boolean;
    z: boolean;
    y?: boolean;
}): Vec3;
/**
 * Maps a block-local face direction to world-space after applying a Y-axis rotation.
 * Used by the mesh builder to find the correct neighbor to check for face culling.
 */
export declare function rotateFace(face: FACE, rotation: number): FACE;
export declare function rotateNormal(normal: Vec3, rotation: number, flip: {
    flipX: boolean;
    flipZ: boolean;
    flipY?: boolean;
}): Vec3;
/** Swaps PosY ↔ NegY; all other faces pass through unchanged. */
export declare function flipYFace(face: FACE): FACE;
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