How to get rid of this red/blue/green grid on objects?

[alexrox360]

I think I may have turned on something in Hammer to do this, but it started showing everything I selected in a red/blue and green grid? I can't get rid of it by restarting Hammer. How do I get rid of it?

 

[radarhead]

The second icon on the top bar is a little grid with "3D" on it. Hit that button to turn this effect off!

 

[alexrox360]

Thanks! I forgot that was there.