PhysicsSetPosition slow down

[YouGroove]

I made a simple translate code using PhysicsSetPosition

 

I put the script below on some character with a simple solid cylinder physics (no character physics) ,

the character moves fast then after some time it slows down , then it regains speed after some seconds.

(i had same thing happen with space ships in the air and not gravity)

 

Is there something particular to do to keep a constant speed throught time ?

Or is this due to physics ?

 

 



Script.speedX = 0.5  

function Script:Start()

end


function Script:UpdateWorld()

end


function Script:UpdatePhysics()

   local window = Window:GetCurrent()

   local xposition = 0

   if window:KeyDown(Key.Q) then xposition =1  end
   if window:KeyDown(Key.D) then xposition = -1 end


   local pos= self.entity:GetPosition(true)
   pos.x= pos.x + (xposition * self.speedX * Time:GetSpeed())

   self.entity:PhysicsSetPosition(pos.x,pos.y,pos.z ,1)


end

[AggrorJorn]

When setting values for physics options, you don't have to multiply with Time:GetSpeed() Since physics are already updated a fixed amount of times per second.

[YouGroove]

My bad, it was some programming behaviour i found comparing two models moving at same time one with PhysicsSetPosition, another with SetPosition.

 

The right script don't have to call GetPosition inside PhysicsLoop , because you need a constant absolute position throught time when moving, and force the object position with PhysicsSetPosition.

 

The good script :

 

Script.speedX = 0.5

function Script:Start()
self.entity:SetGravityMode(false)
self.pos = self.entity:GetPosition(true)
end


function Script:UpdatePhysics()

local window = Window:GetCurrent()

local xposition = 0

if window:KeyDown(Key.Q) then xposition =1 end
if window:KeyDown(Key.D) then xposition = -1 end


self.pos.x= self.pos.x + (xposition * self.speedX * Time:GetSpeed())


self.entity:PhysicsSetPosition(self.pos.x,self.pos.y, self.pos.z ,0.5)


end

 

 

 

When setting values for physics options, you don't have to multiply with Time:GetSpeed() Since physics are already updated a fixed amount of times per second.

ok, i'll take it in account