From v 12.1.5d to 12.1.6d

What's new from version 12.1.5d to 12.1.6d
Preprocess:

Fixed bug creating a contact volume in case of holed surfaces.
Fixed bug with conditions 'over body elements' applied to lines of surfaces (they were lost in the mesh)
Fixed bug connecting points with tetrahedra
Avoid crash meshing spheres in Win x64 platform

Post-process:

Basic support for Iso-geometric analysis (IGA):
- ASCII results file: new location of results 'OnNurbsSurface' defined on control points of a NURBS
- Use of NURBS geometry from preprocess or with an alternative <model>.post.geo optional file
- Automatic creation of a render mesh to represent 'OnNurbsSurface' results
Drawing interior elements: corrected problem when using the 'Display lists' draw method that the view was not actualized when drawing interior elements was enabled or not.
Polygonal cut: corrected two errors
- corrected error when the polygonal cut was done on a mesh that was deformed using a partial defined result, i.e. some nodes do not have deformation information;
- correct segment-ordering of polygonal cut points when the polygonal cut is done on a 3D non-planar mesh.
Gauss Points results: corrected error when reading mixed results defined over standard gauss points, like GP_TETRAHEDRA_4, and user defined gauss points.
Display Stress vectors: added option to change the color of tension vectors, red, and compression vectors, blue. Colors are also saved as preferences.
Display Stress vectors: show legend when drawing the stress vectors showing which are tension vectors and which are compression vectors.
Several fixed bugs related with graphs
Creation of statistical results: allow results 'on gauss points' also.

Customization: