Making of: Block Field tutorial

1. The model
Make two prop_static and use Cleanser model (models/props/portal_cleanser_1.mdl) and put on the wall.

2. The Texture
Make a Brush using Block Field texture, and tie it to func_brush. Let "Solidity"to "Never Soild".

3. Player Clip
Make a soild using Player Clip texture, MAKE SURE YOU DON'T TIE IT TO ANYTHING!

4. Testing
I make a luncher and a catcher to test it.

5. Done!
It works!

Block Field Demo video - Portal: Still Alive Mod for Portal - Mod DB

Hope you know how to make it now!