Making Trim
Subtractive trim
The basic idea is that if you want trim around the base of a room, flush with the wall:
- make a subtract the same base size as the room, and 32 high. Subtract this, and make the room brush smaller too so they don't overlap.
- alternative method: use clipping to split the room subtract 32 units above the floor. (NB split, not clip – produce two brushes)
This technique is useful for walkways and ledges too: instead of subtracting a large room & adding in a ledge, subtract 3 brushes:
- below the ledge
- above the ledge
- and a ledge-thickness piece sandwiched in between
This gives you free trim all the way around the room.
EntropicLqd : If you do it this way don't add a zone portal at the point the two subtract brushes meet. I did that once and my level got flooded with lava 
Took ages to figure out what was causing it.
Tarquin: I can't see how that could have been the problem. Zone Portals can cut across several subtracts.
EntropicLqd : Me neither - but I moved the zone portal down by 8 units and it was fine after that. Here's a small diagram of what I had prior to moving the zone portal down:
| | | | +- Zone portal at join -+ | | | |
The + symbols show the point at which the subtract brushes met. They were adjacent and all the rest of it. It's possible that it was the rebuild that solved the problem - but then why didn't the other zillion previous rebuilds do the same? Dunno m8.
