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# 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.

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