Player motion is not completely 0

sektor-13

Hi,

I have noticed that in some cases my players movement doesn't come to a complete 0 :

I have room with semi-transparent sun rays (sprite). When player walks over these rays and stops, i get

motion.x = 0.000199 and doesnt' fall to 0. I am using LERP for stopping like this: motion.x=lerp(motion.x,0,0.15) But in 99 percent works ok.

Why is that ?

thank you

Megalomaniak

I could be wrong, but that looks like floating point precision is the issue.

https://floating-point-gui.de/ https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html https://en.wikipedia.org/wiki/Half-precision_floating-point_format

sektor-13

Hi,

I agree there is problem with floating point. I have tested other levels to. Problem arises when you approach X < 64.

sektor-13

Update: It is the same thing if i use motion.x = 0 instead of LERP.

Megalomaniak

And the same if you set motion.x = float(false)?

TwistedTwigleg

I've had this issue with rotation at right angles. I got around it by multiplying the value relative to the amount of precision I needed, casting it to an int, and then dividing by the multiplication value.

This is the code I used: var angle = int(round(angle * 100)) / 100.0

That bit of code fixed the issue for that project. I don't know if it will help in this case, but it might be something to try.

sektor-13

Hmm tried everything and nothing works.

I also commented all my __physics_process(delta) code, and wrote just simple move left code. press LEFT - motion.x = 60 no input - motion.x = 0

I got the same result. Looks like that the closer X gets to 0 this happens.

This is what i got: position.x = near 79 motion.x = .000398

position.x = near 70 motion.x = 0

position.x = from 61.4179 to 55 motion.x = .000199

position.x = near 28 motion.x = .0001

Above position.x = 80 everything works ok.