Export a GLB

import { GLTFExporter } from 'three/examples/jsm/exporters/GLTFExporter.js';
import type { BuildingSession } from '@opengeometry/floorkit';

export async function downloadGlb(session: BuildingSession): Promise<void> {
  session.root.updateMatrixWorld(true);
  const result = await new GLTFExporter().parseAsync(session.root, {
    binary: true,
    onlyVisible: true,
  });
  if (!(result instanceof ArrayBuffer)) throw new Error('The exporter did not return a GLB.');
  const url = URL.createObjectURL(new Blob([result], { type: 'model/gltf-binary' }));
  const link = document.createElement('a');
  link.href = url;
  link.download = 'building.glb';
  link.click();
  URL.revokeObjectURL(url);
}

export function storeyGroup(session: BuildingSession, storeyId: string) {
  return session.currentBuild.storeyGroups.get(storeyId);
}