Objects get sudenly jagged edge

[SOLVED] You will get this problem is you’re in orthographic mode.

HI blender artist’s,

I’m working at a chamber for a school project and i suddenly have this problem.

All the edges of my objects are jagged.
It gives the same thing when i render.
But if i make an other cube it doesn’t do this.(even if the are in side the model)
I don’t have much time to try solving this myself, so i hoped some of you had this problem and could tell me what the problem is.

thanks in advanced.


(btw sorry for my bad english)