Camera bobbing dependent on FPS

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#1

Title explains the issue. My camera bobbing uses springs to work and so far I’ve always multiplied it by deltatime.

Multiplying it by deltatime does not fix the issue:

-- inside renderstep

-- dt = deltaTime
springs.walk:shove((bob / config.bobDivisor) * dt * 60 * velocity.Magnitude)
springs.camera:shove((camBob / config.camBobDivisor) * dt * 60 * velocity.Magnitude)

I’ve also tried this, (it did not fix it)

local totalTime = 0
local stepTime = 1/120

function renderStep(dt)
 totalTime = math.min(totalTime+dt,1)
 while totalTime > stepTime do
  -- also tried with and without dt*60
  springs.walk:shove((bob / config.bobDivisor) * velocity.Magnitude)
  springs.camera:shove((camBob / config.camBobDivisor) * velocity.Magnitude)
totalTime-=stepTime
 end
end)

I’ve also tried different equations for scaling on deltatime, none worked:

  1. 1-math.exp(-x*dt)
  2. dt / (1/60)

Every devforum post I saw did not solve my issue, even when using springs.

tl;dr

bobbing speed and size using springs is dependent on fps when scaling by deltatime
i need it to be the same on all fps values

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#2

Try adding the scalar equation after your magnitude variables as well, it should be at the end of the equation IIRC.

Also, are you using spring:update(dt) to update your spring accordingly?

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#3

didn’t change anything.

-- also tried putting dt*60 at the end same result

local n = 1-math.exp(-100*dt)
	
-- spring shoving
springs.walk:shove((bob / config.bobDivisor) * velocity.Magnitude * n)
springs.camera:shove((camBob / config.camBobDivisor) * velocity.Magnitude * n)
springs.sway:shove(newVector3(0, -(mouseDelta.x / config.swayDivisor), mouseDelta.y / config.swayDivisor)) -- dont think this needs to be scaled with dt

-- spring updates
local modelSpring, swaySpring, camSpring, walkSpring, modelRotSpring =
		springs.model:update(dt), springs.sway:update(dt), springs.camera:update(dt), springs.walk:update(dt), springs.modelRot:update(dt)

-- this is how i set the cframes (very hard to read)
	camera.CFrame = camera.CFrame * newAngles(camSpring.x,camSpring.y,camSpring.z) * camRoll
	viewmodel:PivotTo(camera.CFrame * newCFrame(walkSpring.x+modelSpring.x, modelConstantOffset.Y+walkSpring.y+modelSpring.y, modelConstantOffset.Z+modelSpring.z+walkSpring.z) * newAngles(modelRotSpring.x+walkSpring.x+swaySpring.x,modelRotSpring.y+swaySpring.y+walkSpring.y,modelRotSpring.z+swaySpring.z) * modelOffsetLerp)

I think so

#4

Are you attempting to prevent excessive or insufficient movement?

I can’t really tell based on the video, but if you are preventing insufficient you should be dividing your equation by the DeltaTime operand.

While I wait for your answer I’ll continue to investigate why this is happening, however I believe this may be the solution.

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#5

you’re shoving the spring every frame which would shove the springs more or less depending on how many frames per second there are. is there any way of setting a “target” for the spring of sorts?

2 Likes
#6

Yeah i figured it out,
Just used this to run :shove at a consistent rate.

I think its working atleast…

1 Like