Function centerAndScaleModel

preview.js:583–625

(model)

      if (!THREE.STLLoader) {
        throw new Error('STLLoader not available');
      }

      const loader = new THREE.STLLoader();
      const arrayBuffer = await window.electron.readModelFile(filePath);
      if (loadToken !== previewLoadToken) {
        throw new Error('Preview cancelled');
      }

      validateSTLBuffer(arrayBuffer);
      const geometry = loader.parse(arrayBuffer);
      if (!geometry) {
        throw new Error('Failed to parse STL geometry');
      }

      geometry.computeVertexNormals();
      geometry.computeBoundingBox();
      geometry.computeBoundingSphere();

      const material = new THREE.MeshStandardMaterial({
        color: 0x4a9eff,
        metalness: 0.3,
        roughness: 0.6,
        flatShading: false,
        emissive: 0x002244,
        emissiveIntensity: 0.2
      });

      return new THREE.Mesh(geometry, material);
    }

    const loading = document.getElementById('preview-loading');
    if (loading && loading.querySelector('p')) {
      loading.querySelector('p').textContent =
        'Loading 3MF file...\nThis could take time for larger files.';
    }

    preview3mfRequestId = `${Date.now()}_${Math.random().toString(16).slice(2)}`;
    const json = await window.electron.parse3MFPreview(filePath, preview3mfRequestId);
    if (loadToken !== previewLoadToken) {
      throw new Error('Preview cancelled');
    }

    if (!json) {
      throw new Error('Failed to load 3MF file');
    }