Making a doodad walkable

I remember a thread about making doodads walkable. It had something to do with setting the catogory Ramp, and a few other thingys. The problem is, I cant remember which, and I cant find the thread anywhere.

So, anyone?

http://www.wc3campaigns.com/forums/s...threadid=41797 is probably the thread you want. For a demonstration, downoad my tower demo map from it.

Thanks thanks thanks! 8)