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# PhysicsType

An Actor's PhysicsType is set in the Movement → Physics property. Use the SetPhysics() method to change.

PHYS_CinMotion
  (new in UT2003)
PHYS_Falling
  Automatically applies the gravity of the current zone. Pawn-set acceleration in the Z direction is ignored.
PHYS_Flying
  The Pawn or Actor can move independantly from gravity. Velocity on the Z axis is ignored (only in UT?).
PHYS_Hovering
  This is is a fun Physics type. When you an actors physics to PHYS_Hovering, it, er, hovers a few UU off the ground. If you do this to an xPawn?, for example, it will act kind of like a hovercraft. Friction is reduced (so you slide around, and slide down ramps), and if you go at speed up an incline you can do some massive jumps. Good fun. (new in UT2003)
PHYS_Interpolating
  Used in conjunction with bInterpolating in Actor. Seems to also use the PhysRate and PhysAlpha parameters (which I cannot find in UT2003.) I recommend against its use. Seems to be a leftover from the pre-Matinee days.
PHYS_Karma
  Signals an Actor is to be effected by the Karma engine. (new in UT2003)
PHYS_KarmaRagDoll
  This is used for dead pawns. See Karma Ragdoll. (new in UT2003)
PHYS_Ladder
  Applies to an Actor when they are climbing a ladder. (new in UT2003)
PHYS_MovingBrush
  Used for Movers!
PHYS_None
  No native physics code is applied.
PHYS_Projectile
  Uses velocities on all 3 axes but DOES NOT use the current Zone's ZoneGravity and ZoneFluidFriction members to adjust velocity. This means that actors with a velocity are not affected by gravity or friction. Actors with this physics setting do not have any freedom of movement. Acceleration is also processed (please check this!).
PHYS_Rolling
  (removed in UT2003)
PHYS_RootMotion
  (new in UT2003)
PHYS_Rotating
  Only rotation changes. Location doesn't change. If bRotateToDesired is false, then the Actor rotates according to RotationRate. If bRotateToDesired is true, then the Actor rotates to the rotation specified by DesiredRotation at the speed specified by RotationRate.
PHYS_Spider
  Similar to PHYS_Walking except it applies to an Actor against any surface, not just a "ground" surface. An Actor in PHYS_Spider will move against a horizontal OR vertical surface just like in PHYS_Walking. When the end of the surface is reached the Pawn will be set to PHYS_Falling. PHYS_Spider only works on one plane, it will not allow a Pawn to move across perpendicular walls.
PHYS_Swimming
  Similar to PHYS_Flying, but also take the zone's FluidFriction into account. (also Pawn (UT) related)
PHYS_Trailer
  Used to set an Actor to follow its Owner. An Actor set this way has no physics of its own, (*including collision) and simply follow their Owner around. NOTE: There are two settings in the Actor class which can specify the actions of a PHYS_Trailer. First is Actor.bTrailerPrePivot, which, when set to True, causes the Actor in PHYS_Trailer to be positioned away from its Owner by the vector value set in Actor.PrePivot. If not set or left at 0, the Actor in PHYS_Trailer will have the same location as its Owner. Secondly, there is Actor.bTrailerSameRotation, which causes the Actor in PHYS_Trailer to have the same Rotation as its Owner no matter where it is.
PHYS_Walking
  Native physics code for Pawn (UT) class only. Applies all the things that make a pawn move around on the ground. Must have a Base set, without a Base to walk on, this turns to PHYS_Falling.

## Comments

RoninLord: The physics variables PHYS_RootMotion, PHYS_KarmaRagDoll, PHYS_Hovering and PHYS_CinMotion are not used in any of the Unreal Tournamnet 2003 source files and so probably only have significance to the engine.

Eldhrin: I would expect that we may see these in future games on the new Unreal engine builds, such as Unreal II. Although Deus Ex 2's going to be completely different probably... different physics engine.

DJPaul: Yes. It will be interesting to compare the relative merits of both Karma and Havok physics engine. Also, it will be fun to see how the Wiki evolves to handle information for both Physics.

SocratesJohnson: In my experience PHYS_Flying does not ignore Z velocity. My Freefall mutator uses it exclusively and I have no problems in the Z direction. It does apply a strange 'drag' on the velocity in all direcitons, though. Perhaps this was a change for UT2003? I've added a few notes to the physics types above from my own fiddling, please correct me if I'm wrong.

Foxpaw: I think it's a bit unfair to say that Karma Ragdolls are used only for dead pawns.. that's all epic uses them for but they have other possibilities.

Quad PHYS_Walking, PHYS_Flying and I'm sure others all restrict the maximum velocity to the appropriate *Speed variable's setting. However, PHYS_Falling does not.

## Related Topics

- Actor, Actor (UT) class
- Actor/Movement properties

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