Collisions
1
Drag a valid .FBX mesh into your map package in UDK:
2
Double click it in the Content Browser and uncheck the three checkmarks at the bottom of the pane on the right:
3
Drag the mesh into the map, or Right Click and select Add StaticMesh: _.
Open its Properties:
Uncheck “Disable All Rigid Body”: 
Check “Block Rigid Body”: 
Check “Accepts Dynamic Decals” to allow the ball indicator circle: 
4
Assign the StickyWalls Physical Material to map geometry:
