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# Actor (UT)/Movement

Properties that relate to location, orientation and movement.

AttachTag
  see Attaching Actors
bBounce
  Bounces when hits ground fast
bFixedRotationDir
  Fixed direction of rotation
bRotateToDesired
  Rotate to DesiredRotation
Buoyancy
  Water buoyancy define values
DesiredRotation
  Physics will smoothly rotate actor to this rotation if bRotateToDesired.
Location
  a vector giving the position of the actor in the world. Remember when setting this that the engine uses a left-handed coordinate system (see Handedness for definition & pictures).
Mass
  Mass of this actor. define values
Physics
  see PhysicsType for the list
Rotation
  see below.
RotationRate
  Change in rotation per second.
Velocity
  Actor's velocity.

## Rotation

Rotations are measured in unreal rotation units. A right angle is 16384.

Note that an actor's rotation can be set graphically: Setting Advanced → bDirectional to True will cause UnrealEd to display a direction arrow on the actor. It is then possible to rotate it the same way as a brush.

Quick definition of the rotation angles. Imagine you are standing at the origin, facing the positive X axis.

Pitch
  Tilting forward or backward, dipping on the X axis.
Roll
  Wobbling from side to side, dipping on the Y axis.
Yaw
  Turning from left to right.

## Related Topics

- Actor Overview

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