From 12 to 13

Main news from version 12 to version 13. (See detailed changes for the full list of news).
General:

Preprocess:

New STEP export, and enhanced import.
Import XYZ nodes: option to triangulate/tetrahedrize connecting them.
Create a geometrical surface from each selected triangle or quadrilateral element.
'Granular' sphere/circle mesh generator plugin included in GiD.
New MinElem surface mesher. It tries to generate the minimum number of elements in a surface taking care of the given chordal error.
Octree-based volume mesher: added options to control whether lines or points should be skipped when meshing surfaces using Rjump.
Parallel meshing of surfaces.
List entities: new 'Lines uv' button to show the lines in uv parametric space of a trimmed surface.

->

Layers: allow deletion also if it has entities, parts in back, conditions or child layers.
Draw entities of frozen layers in grayed color.
Internet retrieve window: allow get plugins and other documents, and filters to hide incompatible or existent modules.

Post-process:

Customization:

CustomLib library now freely available for all problemtype developers (and documented in customization manual)
Tcl/Tk updated to last version: Tcl/Tk 8.6.5
Added new Tcl packages (sqlite database, etc.) and updated the versions of the old ones
New GiD-Tcl commands related to geometry, mesh, postprocess sets, results
New GiD_Events related to read project, transform, layers, intervals, conditions, graphs and graph-sets, etc.
New command line flag -m <alternative_macros.tcl> to allow use different user macros file (e.g. for different problemtypes)
Plugin to import a new geometry format: CALCULIX .fbd format
Voro plugin that wraps the voro++ program to create Voronoi tessellations as GiD geometry.

Other: