UE1 - UT MoveSmooth & Move
- Thread starter Davill
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A call to Move is supposed to stop as soon as a blocking object is encountered (so if the entire distance delta may not be moved, the actor will only move part of that distance). MoveSmooth is supposed to try and slide the actor along even if that means "stepping up" or poking below a ledge, or hitting a wall and moving along it.
If an actor is set to not collide with anything there would be no visible difference between using move and movesmooth.
If an actor is set to not collide with anything there would be no visible difference between using move and movesmooth.
Sort of, but not really. If the actor has its physics set to anything other than PHYS_None, it should automatically have move or movesmooth called from native code every tick with the delta distance being calculated (roughly) something like:
If you set Physics to PHYS_None, you could probably use the above function to simulate the native movement (and using some other variable for the Physics checks). I don't remember if there was a simple way to specify whether move or movesmooth would be called, but my best guess is that it is solely based on whether the actor collides with anything else (world geometry or other actors) or not. MoveSmooth will also take into account the MaxStepHeight to determine how far up to perform offset traces when seeing whether the actor can move into a location or not.
See this UDN page for a better explanation.
Code:
//pseudo code, not sure if gravity vector is always added, or only when falling
simulated function TickMove(float dt) { // dt is deltatime, the maount of time that has passed since the last frame
local vector vMoveDelta;
local vector vClampVel;
// calculate clamped velocity
vClampVel = Velocity + acceleration*dt;
if(Physics == PHYS_Walking) vClampVel = Normal(vClampVel) * FMin(VSize(vClampVel), GroundSpeed);
else if(Physics == PHYS_Falling){
vClampVel.Z=0; // don't take into account the vertical component when clamping velocity while falling
vClampVel = Normal(vClampVel) * FMin(VSize(vClampVel), GroundSpeed) + gravity*dt + Velocity.Z * vect(0,0,1); // don't forget to add gravitational "pull" and the existing Z component of velocity
}
else if(Physics == PHYS_Flying) vClampVel = Normal(vClampVel) * FMin(VSize(vClampVel), AirSpeed);
else if(Physics == PHYS_Swimming) vClampVel = Normal(vClampVel) * FMin(VSize(vClampVel), WaterSpeed);
vMoveDelta = vClampVel*dt;
MoveSmooth(vMoveDelta);
}If you set Physics to PHYS_None, you could probably use the above function to simulate the native movement (and using some other variable for the Physics checks). I don't remember if there was a simple way to specify whether move or movesmooth would be called, but my best guess is that it is solely based on whether the actor collides with anything else (world geometry or other actors) or not. MoveSmooth will also take into account the MaxStepHeight to determine how far up to perform offset traces when seeing whether the actor can move into a location or not.
See this UDN page for a better explanation.
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