Created a jail. Used a masked bar texture for the cells. Made them with a brush first. Looked great but couldn't shoot through them, so I used a sheet. I Can shoot through the cells but, I can also walk through them! I tried making a 'Invisable Collision Hull' in front and behind them. Didn't stop me from walking in the cell. I made sure the ICH was not touching the floor or walls or anthing else, just hanging there. Tried 1 sided, tried 2 sided. Tried playing with the brush properties, still nothing. Tried to force 'Solid', again nothing. What am I missing please!