Hy
how can i position a vertex in consideration on a parent?
Tformpoint should do the trick ...
A point directly 10 units in front of the parent would be calculated as follows ..
tformpoint 0,0,10, Parent , 0
Then position your vertex at point tformedx(), tformedy(), tformedz()
I guess it depends on exactly what your trying to achieve but the tform commands are you friends here.
Stevie