How to clear the command history in the console?

IN JKA a guy told me to put a command in the console that made evrything blurry any ideas on how to reverse it?

• I was playing Jedi knight academy multiplayer and someone told me to put a command in the console. it was something like R_Primitives 69 and when i did it it made everything blurry and spacey. Now when ever i go on no matter what server i go on the screen is white and spacey. Any ideas on how to reverse it??????????

• Answer:

  Type in R_primitives 0. That's the default.