code: function resizeBuffers (additionalSize) {
      const minimumNeededSize = index + additionalSize;
      if (minimumNeededSize > geomBuffer.vertices.length) {
          const newSize = 2 * minimumNeededSize;
          geomBuffer.vertices = resizeBuffer(geomBuffer.vertices, newSize);
          geomBuffer.normals = resizeBuffer(geomBuffer.normals, newSize);
      }
  }
docs: Resize buffers as needed if `additionalSize` floats overflow the current buffers