Function loadObj

lib/loadObj.js:65–517

* Parse an obj file. * * @param {String} objPath Path to the obj file. * @param {Object} options The options object passed along from lib/obj2gltf.js * @returns {Promise} A promise resolving to the obj data, which includes an array of nodes containing geometry information and an array of materia

(objPath, options)

 * @private
 */
function loadObj(objPath, options) {
  const axisTransform = getAxisTransform(
    options.inputUpAxis,
    options.outputUpAxis,
  );

  // Global store of vertex attributes listed in the obj file
  let globalPositions = new ArrayStorage(ComponentDatatype.FLOAT);
  let globalNormals = new ArrayStorage(ComponentDatatype.FLOAT);
  let globalUvs = new ArrayStorage(ComponentDatatype.FLOAT);

  // The current node, mesh, and primitive
  let node;
  let mesh;
  let primitive;
  let activeMaterial;

  // All nodes seen in the obj
  const nodes = [];

  // Used to build the indices. The vertex cache is unique to each primitive.
  let vertexCache = {};
  const vertexCacheLimit = 1000000;
  let vertexCacheCount = 0;
  let vertexCount = 0;

  // All mtl paths seen in the obj
  let mtlPaths = [];

  // Buffers for face data that spans multiple lines
  let lineBuffer = "";

  // Used for parsing face data
  const faceVertices = [];
  const facePositions = [];
  const faceUvs = [];
  const faceNormals = [];

  function clearVertexCache() {
    vertexCache = {};
    vertexCacheCount = 0;
  }

  function getName(name) {
    return name === "" ? undefined : name;
  }

  function addNode(name) {
    node = new Node();
    node.name = getName(name);
    nodes.push(node);
    addMesh();
  }

  function addMesh(name) {
    mesh = new Mesh();
    mesh.name = getName(name);
    node.meshes.push(mesh);