import type { Layers } from 'three';
/** Default Three.js layer for main scene geometry. */
export declare const SCENE_LAYER = 0;
/**
 * Layer for editor-only overlays (gizmos, move handles, tool previews, grid).
 * The post-processing pipeline excludes this layer from the depth/normal MRT
 * scene pass so the screen-space ink and SSGI never treat overlays as geometry,
 * then composites it back on top via a dedicated overlay pass.
 *
 * Editor's `EDITOR_LAYER` (packages/editor) re-exports this — they MUST match.
 */
export declare const OVERLAY_LAYER = 1;
/** Layer used for zone rendering (floor fills and wall borders). */
export declare const ZONE_LAYER = 2;
/**
 * Layer for the editor ground grid. Rendered *inside* the scene pass (so scene
 * geometry depth-occludes it instead of it bleeding through walls/objects) — it
 * is a flat, depth-non-writing plane, so the screen-space ink never picks it up.
 * Kept off OVERLAY_LAYER because overlays composite on top with no scene-depth
 * test, which is exactly what we don't want for a full-floor plane. Excluded
 * from thumbnails like the other editor-only layers.
 */
export declare const GRID_LAYER = 3;
/**
 * Layer for geometry hidden from the color passes but still rendered into the
 * shadow map ("shadow-caster-only"). Used when cutaway/solo views hide roofs
 * or non-selected levels: the sun keeps casting their shadows, so interiors
 * get window-shaped light patches instead of flooding with uniform sun.
 * No camera or pass enables this layer — only each shadow-casting light's
 * shadow camera does (see `lights.tsx`). Applied per-object (layers don't
 * cascade) via `applyShadowOnly` / `clearShadowOnly` in `lib/shadow-only.ts`.
 */
export declare const SHADOW_ONLY_LAYER = 4;
/**
 * Layer for source geometry that a collective batch already draws. No camera
 * or pass enables it, so a batched object costs no draw call while its children
 * and interaction proxies remain in the graph.
 *
 * Raycasters that query real surfaces must opt in via
 * {@link setSurfaceRaycastLayers}, otherwise a sewn wall would stop answering
 * measurement rays.
 */
export declare const BATCHED_LAYER = 5;
/**
 * Aims a raycaster at every real scene surface, whether a wall still draws
 * itself or a level batch draws it for us.
 */
export declare function setSurfaceRaycastLayers(layers: Layers): void;
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