import * as THREE from 'three/webgpu';
/**
 * Single three-vertex geometry for fullscreen passes and vertex-pulled impostors.
 *
 * **Purpose**
 * - Efficient fullscreen pass geometry (1 triangle vs 2 for quad)
 * - Covers entire screen in clip space: (-1,-1) to (3,-1) to (-1,3)
 * - Eliminates center seam artifact present in traditional screen quads
 * - Supplies a non-indexed three-vertex draw count for `positionNode`-driven
 *   impostors. In that role the position/normal/UV attribute values are inert;
 *   disable frustum culling and raycasting because the stored bounds still
 *   describe the fullscreen triangle rather than the generated instances.
 *
 * **Usage**
 * ```js
 * import { TriangleGeometry } from '../helpers/exampleGeometries.js';
 * import { MeshBasicNodeMaterial } from 'three/webgpu';
 * import { pass, screenUV } from 'three/tsl';
 *
 * // Fullscreen post-processing
 * const scenePass = pass(scene, camera);
 * const postGeo = new TriangleGeometry();
 * const postMat = new MeshBasicNodeMaterial();
 * postMat.colorNode = scenePass.mul(0.5); // Darken scene
 *
 * const postMesh = new Mesh(postGeo, postMat);
 * postMesh.frustumCulled = false;
 *
 * // Vertex-pulled particle impostors
 * const particles = new Mesh(postGeo, sphereImpostorMaterial);
 * particles.count = particleCount;
 * particles.frustumCulled = false;
 * particles.raycast = () => {};
 * ```
 *
 * @class TriangleGeometry
 * @extends THREE.BufferGeometry
 * @tags WebGPU, WebGL
 * @short Three-vertex geometry for fullscreen passes and vertex-pulled impostors.
 * @category Geometries
 */
declare class TriangleGeometry extends THREE.BufferGeometry {
    /**
     * Create a fullscreen triangle geometry with position, normal, and UV attributes.
     */
    constructor();
}
export { TriangleGeometry };