Function loadPreviewModel

preview.js:449–580

(filePath, loadToken)

  function hasColorData(object) {
    let hasColor = false;
    object.traverse((child) => {
      if (!child.isMesh) return;
      const geometry = child.geometry;
      if (geometry && geometry.attributes && geometry.attributes.color) {
        hasColor = true;
      }
      const material = child.material;
      const materials = Array.isArray(material) ? material : [material];
      for (const mat of materials) {
        if (!mat) continue;
        if (mat.map || mat.vertexColors) {
          hasColor = true;
        }
        if (mat.color) {
          const { r, g, b } = mat.color;
          if (r > 0.05 || g > 0.05 || b > 0.05) {
            hasColor = true;
          }
        }
      }
    });
    return hasColor;
  }

  function applyDefaultMetalMaterial(object) {
    const material = new THREE.MeshStandardMaterial({
      color: 0x4a4a4a,
      metalness: 0.85,
      roughness: 0.35,
      flatShading: false
    });

    object.traverse((child) => {
      if (!child.isMesh) return;
      if (Array.isArray(child.material)) {
        child.material = child.material.map(() => material.clone());
      } else {
        child.material = material.clone();
      }
    });
  }

  function ensureLitMaterials(object) {
    object.traverse((child) => {
      if (!child.isMesh) return;
      const materials = Array.isArray(child.material) ? child.material : [child.material];
      materials.forEach((mat, index) => {
        if (!mat) return;
        const hasTexture = !!mat.map;
        const usesVertexColors = !!mat.vertexColors;
        const color = mat.color ? mat.color.clone() : new THREE.Color(0xffffff);
        if (hasTexture || usesVertexColors) {
          color.set(0xffffff);
        }
        if (mat.isMeshBasicMaterial) {
          const converted = new THREE.MeshStandardMaterial({
            color,
            map: mat.map || null,