Resolved Delta time doesn't work as supposed to

Code (CSharp):

1.  void FixedUpdate()
2.     {
3.         //add a forward force
4.         rigidBody.AddForce(fowardForce * Time.deltaTime, 0, 0 );
5.  
6.         //if (Input.GetKey("d"))
7.         //{
8.         //    rigidBody.AddForce(0,0,rightForce * Time.deltaTime);
9.        // }
10.     }

This is the code, normally if I removed deltaTime it would work, but when I add it so it's not dependent on framerate, it doesn't move at all.

 

Don't use delta time of ANY kind with a force or when setting velocity directly.

Note the example code here:

https://docs.unity3d.com/ScriptReference/Rigidbody.AddForce.html

If YOU are moving it ,use deltaTime. If you are adding a force, the Physics takes care of it.

 

I'm basically trying to make sure the rate of movement isn't affected by framerate, this code is also from a tutorial I will link "

" when he uses delta time, with the same values as me, it works for me. IDK if it's a unity update that changes that or something, I just want to be able to know how.

 

That happens automatically whenever you set or change the velocity of a Rigidbody (e.g. via AddForce). The physics engine does the actual movement, and it is done in a framerate-independent way by default.

 

FixedUpdate is already framerate-independent, so anything you do inside of FixedUpdate is already framerate-independent by default. Multiplying by Time.deltaTime just means it will be smaller by a factor of your fixed time step--which may sometimes be conceptually convenient so you can express things in amount-per-second instead of amount-per-frame, but won't change whether something is or is not framerate-dependent.

(If you were using Update instead of FixedUpdate, then things would be different.)

So when you say it "doesn't move at all", that's presumably just because you aren't pushing as hard. If you increase your "forwardForce" variable by a factor of 50, you should get the same result as before you started multiplying by Time.deltaTime. (By default, fixedDeltaTime = 0.02.)

 

You missed the whole point of the name FixedUpdate, it means the time interval between calls is constant(in simulation time, not real life execution time, it gets a bit complicated)

 

I tried increasing it by a value of 50, but nothing changed

 

Did you remove Time.deltaTime, as it's not appropriate in this context?

 

Then something is going on that I can't tell from the information you've posted. (Statistically, this means you are not testing what you think you are testing, because programmer mistakes are far more common than weird systemic problems.)

 

nvm I'm stupid

 

I made it a public variable, so it was being overridden by the values in the editor, so all I had to do was change it value in the editor.