import { WebGLRenderer, WebGLRenderTarget, WebGLCubeRenderTarget, Scene, Camera, CubeCamera, OrthographicCamera, Mesh, Matrix3, Matrix4 } from 'three';
/**
 * Resources needed for fisheye rendering.
 * Created once and reused across frames, or created temporarily for snapshots.
 */
export interface FisheyeResources {
    cubeRenderTarget: WebGLCubeRenderTarget;
    cubeCamera: CubeCamera;
    fisheyeScene: Scene;
    orthoCamera: OrthographicCamera;
    planeMesh: Mesh;
    tempMatrix4: Matrix4;
    tempMatrix3: Matrix3;
}
/**
 * Update CubeCamera's near/far clipping planes.
 * Call this when camera near/far changes (low frequency operation).
 */
export declare function updateFisheyeClippingPlanes(resources: FisheyeResources, near: number, far: number): void;
export interface CreateFisheyeResourcesParams {
    /** Resolution for each face of the cube map */
    cubeResolution: number;
    /** Field of view in degrees (typically 180 for fisheye) */
    fov: number;
    /** Near clipping plane */
    near?: number;
    /** Far clipping plane */
    far?: number;
}
export interface RenderFisheyeToTargetParams {
    gl: WebGLRenderer;
    scene: Scene;
    camera: Camera;
    renderTarget: WebGLRenderTarget;
    resources: FisheyeResources;
}
/**
 * Create all resources needed for fisheye rendering.
 * These resources should be reused across frames for efficiency.
 */
export declare function createFisheyeResources({ cubeResolution, fov, near, far, }: CreateFisheyeResourcesParams): FisheyeResources;
/**
 * Dispose all fisheye resources to free GPU memory.
 */
export declare function disposeFisheyeResources(resources: FisheyeResources): void;
/**
 * Render a fisheye camera view to a render target.
 *
 * Pipeline:
 * 1. CubeCamera captures the scene from the camera position (6 faces)
 * 2. A custom shader projects the cubemap using equidistant fisheye projection
 * 3. An orthographic camera renders the result to the preview renderTarget
 */
export declare function renderFisheyeToTarget({ gl, scene, camera, renderTarget, resources, }: RenderFisheyeToTargetParams): void;