Voxler can calculate volume from an Isosurface module or a FaceRender module. With an Isosurface or FaceRender module is selected in the Network Manager, click the General tab in the Property Manager. Expand Isosurface or Facerender respectively. Check the box next to Compute volume to display the volume values. The Isosurface will display the value above and below the specific isovalue. The FaceRender module shows approximate volume which is controlled by the blocks that are visible.
Updated December 3, 2015