My render seems botched?

My project used to be fine before I tried any rendering now everything looks as if they melted together on every view type except wireframe. I really don’t know how to fix this, I tried to assign them to a new layer for default material but didn’t work. I added a picture of the wireframe perspective for how it’s supposed to look and rendered perspective to show its state now. Please help!

Maybe your model is to far ways from the 0,0,0 origin and you see numerical errors caused by the large numbers. An other problem could be wrong mesh settings.