Sorry about that Mago, we didn't wanted to confuse you, this is something that has to be handled in the way the decoration is spawned in the world, which is done via VavoomC, so it can't be done with a map editor, the only thing that could control this is how you import the sprites into a WAD file, do you remember how sprites work in the Doom engine?
That you create a sprite lump with a 4 letter name, a letter for the frame (A, B, C, etc.) and numbers that describe the angles where the sprite is being seen (1, 2, 3, 4, etc.). If you create a sprite lump with a 0 in the angles, it will be just seen from the front angle. Well, this is something similar to that, but it's done via the progs.
If you want I'll create a thread in the KDev forums as well as some examples of this by modifying the source
, I really don't want to confuse you, but I don't think my explanation was clear enough
, so by making an example it might be clearer for all.