Method similar to Unity's SmoothDamp?

Is there a way to to something similar to Unity's SmoothDamp Method? The way it works is like this(leaving out some bits):

SmoothDamp(5,100,6)

And then it transition 5 to 100 over the course of 6 seconds. While returning the value every time it changes. So you could change opacity and such over the course of however long, smoothly. Anyone know how I can do this?

It can probably be done using a "advanced" lerp function depending if you want a regular increase or not ... using lerp the problem is the third parameter and math is my nemesis so ... i let "expert" give you a more complete answer ! ... it can perhaps be done using a "sin" too

A very interesting post (not as mine ;-p) about this kind of effects

interpolation

thanks for this very interesting post !

Perhaps something more simple ... if you add dt to a variable every tick, it adds 1 to this variable every second so consider "x" = "targetvalue-value" must be reach in 6 seconds perhaps :

every tick :

value = value + dt * (x/6) ?

DoubleElite you have found something else ? ... my answer is good, not good ? and why ?

Sorry but people requesting for help and forgetting they have do so ... it's really something i don't like at all ...

I tried to experiment with your idea to lerp() expression, well it didn't, maybe i did wrong, anyways i would love to see a proof...

It depends on your interpretation of "smooth".

Lerp offers a transition similar, but its a curve so the start, and end can be slower than the middle. Ease out, ease in if you will.

Also you cant really do exactly 6 seconds, nor should you expect that in a system that goes on frame rate.

However, if that's not terribly important, you can get a close approximation using dt.

I'd suggest some experimentation with variables as triggers if you absolutely have to that kind of precession.

Just be ready for frame skips.

Try this to have a sprite change it's x from 5 to 100 in 6 seconds after a click.

global variable start_value=5

global variable end_value=100

global variable duration=6

global variable start_time=0

+On click

--- set start_time to time

+time < start_time+duration

--- Sprite: set x to lerp(start_value, end_value, (time-start_time)/duration)

+time >= start_time+duration

+trigger once

--- Sprite: set x to end_value

You could try taking a look at this behaviour easytween by lunarray