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# Actor (UT)/Collision

These properties determine the size and behaviour of an Actor's collision cylinder.

Note that the cylinder is always upright, no matter what the Actor's orientation.

## Properties

### Flags

bBlockActors
  Blocks non-player Actors.
bBlockPlayers
  Blocks player actors (PlayerPawns and Bot (UT)s).
bCollideActors
  Collides with other Actors.
bCollideWorld
  Collides with the world geometry.
bCollideWhenPlacing
  Collides when being moved; can't be set into geometry.
bProjTarget
  Set this true if you want your object to be a potential target for projectiles (subject to adjusted aim in single-player mode).

### Collision Cylinder

The size of the collision cylinder is given by the two properties CollisionHeight and CollisionRadius.

## Related topics

- DuckingZone – A zone where ducking players actually become smaller in Unreal Tournament.
- Collision Cylinder – Details on collision and on `Touch`, `Untouch` and other related events.
- OCD – Technical lowdown of object collision detection.
- Actor Overview – More on working with Actors, adding actors to a map and setting properties.

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