What's new from version 8.1.2b to 8.1.3b
Volume split (similar to surface split, to divide a volume from a group of dividing surfaces)
Locate real size background images from a .tfw georeferentiation file if exists
drawopengl font GiD-Tcl command, to set fonts and ask its properties
write_calc_data GiD-Tcl command, to write the calculation file from Tcl
New options for reflection: individual faces selection, layer color or two color degradation for switched off faces. 
a preview image and the view is saved together with the mesh and results