thickenabs{
move a given part of the geometry by an absolute value of distance
EXPERIMENTAL only.
Thicken the geometry by moving the node points of the defined geometry parts.
thickeningDistance = the distance the boundary elements have to be moved is absolutely given by \( D_i = \text{thickeningDistance}\) (no relative movement!!!!)
N_ThickeningLoops = the moving of the distance \( D_i\) is subdivided into N_ThickeningLoops steps.