[LDPE] Rookie trying to accomplish a simple task

[Max Martin Richter]

Given that the vertices half way are on all the same hight:

* I would draw a quad (looking from above) so that is 90 degree to the current triangles
* Set y of the quad to the hight of the vertices
* Select the quad and the triangles
* Isecalc
* You'll get vertices at the correct intersections
* Use those vertices to redraw the triangels

That’s how I do it. Sometimes I use Isecalc and sometimes Intersector for this task.