code: public float[] getTexCoords(int index)
      {
          final String key = (index > 0) ? (KEY_TEXCOORD + index) : KEY_TEXCOORD;
          return mVertices.getFloatArray(key);
      }
docs: Retrieves a set of texture coordinates from the mesh.
  <p>
  A mesh may have multiple sets of texture coordinates
  Each texture coordinate is represented as a packed {@code float} pair:
  <p>
  <code>{ u0, v0, u1, v1, u2, v2, ...}</code>
  This function retrieves the <i>a_texcoordN</i> vertex attribute where N is
  the value of the <i>index</i> argument.
  @param index
  0-based index indicating which set of texture coordinates to get.
  @see #getTexCoords()
  @see GVRVertexBuffer#getFloatArray(String)