Irrlicht Engine

For terrains, there is an extremely fast way to do shadow mapping, but it only works if the light rays are travelling parallel to one edge of the terrain. Basically, for each row, you set the current y position the first height value of the first vertex. Then, you go through all the vertices in that ...

How can I set a scene node so that it always draws on top of everything else?
Thanks in advance

If one exists, can somebody post a link please. I searched, and couldn't find one