GML Linear interpolation (lerp) analogues?

[Edwin]

I want to slowly "move" my value from, for example: 2 to 0 without "this":


Sometimes, values that need to slowly decrease or increase are starting to "twitch", trying to get into a certain interval or position.

How to fix it?

 

[flyingsaucerinvasion]

what are you doing presently that is responsible for that twitching?

 

[Edwin]

what are you doing presently that is responsible for that twitching?

For example, in movement: if the speed variable is not rounded or floored (I forgot how it's called), it can twitch to make the hspeed value equal 0, but can not do it.

 

[flyingsaucerinvasion]

I don't understand what you're talking about.

 

[dannyjenn]

Are you using the lerp function?

 

[dannyjenn]

The twitching seems like you're overshooting the 0, then overcorrecting, then overshooting again, and so on. You could probably solve that in a number of ways. e.g. max(0,amount) will prevent it from overshooting. min(0,amount) will prevent it from overcorrecting.

 

[samspade]

I want to slowly "move" my value from, for example: 2 to 0 without "this":
View attachment 20575

Sometimes, values that need to slowly decrease or increase are starting to "twitch", trying to get into a certain interval or position.

How to fix it?

Remember to post your code so we don't have to guess at what is going on.

 

[Edwin]

Remember to post your code so we don't have to guess at what is going on.

I'm asking lerp function analogues that works perfectly.

 

[Toque]

I'm asking lerp function analogues that works perfectly.

I think if you post your code people will help you with lerp()

 

[TheSnidr]

Smoothstep is a useful function similar to lerp, but allows for smoother movements.
Since you haven't posted any code, we can only guess how you made your thing bounce back and forth. So please post your code, we're not playing the guessing game.

For making something move smoothly from one place to another, I personally like setting the movement speed to a factor times the distance. This makes an object move fast in the beginning, then slower as it nears its target.
Something like this:

//Create
startValue = 0;
targetValue = 100;
speedFactor = 0.2;

//Step
startValue += speedFactor * (targetValue - startValue);

//Or alternatively like this:
startValue = lerp(startValue, targetValue, speedFactor);

 

[Phil Strahl]

By the way, here's a great talk on various kinds of easing functions with lots of examples:

 

[samspade]

I'm asking lerp function analogues that works perfectly.

I'm not sure I understand. lerp does work perfectly. It does exactly what it is supposed to every time. If you're getting unexpected results then there is something in your code, which is why you should post it.

If you like how that looks but want something similar, look up easing and tweening. Those all function like lerp, they interpolate between one number and another, but the difference is in how they interpolate. There are several free tweening assets available in the marketplace as well.