jtBaseApp/node_modules/cesium/Source/Scene/ModelMesh.js

/**
 * A model's mesh and its materials.
 * <p>
 * Use {@link Model#getMesh} to create an instance.
 * </p>
 *
 * @alias ModelMesh
 * @internalConstructor
 * @class
 *
 * @see Model#getMesh
 */
function ModelMesh(mesh, runtimeMaterialsById, id) {
  const materials = [];
  const primitives = mesh.primitives;
  const length = primitives.length;
  for (let i = 0; i < length; ++i) {
    const p = primitives[i];
    materials[i] = runtimeMaterialsById[p.material];
  }

  this._name = mesh.name;
  this._materials = materials;
  this._id = id;
}

Object.defineProperties(ModelMesh.prototype, {
  /**
   * The value of the <code>name</code> property of this mesh.
   *
   * @memberof ModelMesh.prototype
   *
   * @type {String}
   * @readonly
   */
  name: {
    get: function () {
      return this._name;
    },
  },

  /**
   * The index of the mesh.
   *
   * @memberof ModelMesh.prototype
   *
   * @type {String}
   * @readonly
   */
  id: {
    get: function () {
      return this._id;
    },
  },

  /**
   * An array of {@link ModelMaterial} instances indexed by the mesh's
   * primitive indices.
   *
   * @memberof ModelMesh.prototype
   *
   * @type {ModelMaterial[]}
   * @readonly
   */
  materials: {
    get: function () {
      return this._materials;
    },
  },
});
export default ModelMesh;