Some users have requested the possibility to include some fixed points into the grid.
I was not very excited about this - in anisotropical grid generation the arbitrary inclusion of points usually leads to very bad Delaunay grids. But for isotropical grid generation, this operation is useful.
The reference example how to do this is mainplist.c
You have to define all point data correctly by yourself. Especially an incorrect type or segment definition will lead to immediate failure during grid generation, because the segment of the cells containing these additional points cannot be computed correctly.
The pointlist will be transferred to the grid generator as an external parameter of type ibgPoints named ibggExternalPoints, defined in ibgg.h.