why topografic relief doesn't affect visual field?

[Ghoustaq]

In SupCom a unit can see everything in the range of its visual radius even if it was imprisoned by walls. I think that is not realistic. In some other RTS games elevations and props do affect visual field. For example, in Warcraft the units at the top of a slope will get more visual fields than the ones at the bottom, and units can't see anything hidden in forests unless trees are cut or burned.

I'm not sure if it is a design defect of this game. Has anyone tried to fix it?

[Sprouto]

You're correct - it is a defect - and as far as I know - we have no ability to change that.

[Franck83]

Modern 3D engine (like Unity) can cast ray test towards a target. So if there is an elevation, it can return it back.
I know no such function in supcom. As sprouto said it s a defect.

In all cases, these kind of function must be hard coded because of the performance cost (all units in all direction should be tested)