How to do slippery surface in 2D top vue ?

I was wondering how I could make the oil puddle be slippery (like if the tank stops accelerating, he still moves a little bit) .
I don't use gravity in this scene and I use physics to move my character.
I was hoping someone could give me a hint about how to do that (I am pretty bad when it comes to use physics and movements).

 

@joxthebest314

If you are using Physics2D in top down view, you can't probably use friction, but you could do trigger check, and whenever player vehicle enters a puddle.

Modify your "braking" force which you normally use to stop your vehicle gradually when there is no movement input. Simply make it go to zero slower, and your vehicle will stop later than on solid ground. Of course, if you now stop immediately when you have no input, then you'll have to modify your stopping code too.

 

For the movements, I just use the "Rigidbody2D.MovePosition" method, and the character stops as soon as there are no other inputs.

I understand what you said, but I don't know really how to do a "stopping code".

Is there an example somewhere ?

 

ah you should move by using Rigidbody2D.Addforce

 

Why ? This method works perfectly.

 

Thanks for the answer, but I don't really understand why I sould use a kinematic RB ( I wasn't and didn't noticed anything).

In fact, I am really not good when it comes to physics and movements, but here is my code :

Code (CSharp):

1.  void FixedUpdate()
2.     {
3.         var movePosition = Vector2.zero;
4.         var moveRotation = 0f;
5.  
6.         if(Input.GetKey(InputManager.IM.forwardOrange))
7.         {
8.             movePosition += new Vector2(Mathf.Cos(rotation),Mathf.Sin(rotation)) * speed;
9.             anim.SetBool("isMovingForward", true);
10.         }
11.         else
12.         {
13.             anim.SetBool("isMovingForward", false);
14.         }
15.  
16.         if(Input.GetKey(InputManager.IM.rotateRightOrange))
17.         {
18.             moveRotation -= rotationSpeed;
19.             anim.SetBool("isRotatingRight", true);
20.         }
21.         else
22.         {
23.             anim.SetBool("isRotatingRight", false);
24.         }
25.  
26.         if(Input.GetKey(InputManager.IM.rotateLeftOrange))
27.         {
28.             moveRotation += rotationSpeed;
29.             anim.SetBool("isRotatingLeft", true);
30.         }
31.         else
32.         {
33.             anim.SetBool("isRotatingLeft", false);
34.         }
35.  
36.         if(Input.GetKey(InputManager.IM.backwardOrange))
37.         {
38.              movePosition -= new Vector2(Mathf.Cos(rotation),Mathf.Sin(rotation)) * speed;
39.              anim.SetBool("isMovingBackward", true);
40.         }
41.         else
42.         {
43.             anim.SetBool("isMovingBackward", false);
44.         }
45.  
46.         rb.MovePosition(rb.position + movePosition * Time.fixedDeltaTime);
47.  
48.         rb.MoveRotation(rb.rotation + moveRotation * Time.fixedDeltaTime);
49.  
50.         rotation = Mathf.Deg2Rad * rb.rotation;
51.     }

This code is really strange, because I need the tank to still go forward using like W, even if the tank is facing the bottom of the screen (it means the A and D keys are rotating the tank and the W and S keys are moving it, according to its rotation).

Someone helped me to do this code (I asked for help on a unity forum), so I don't really know if it is worth changing all my moving method.

 

well you need it if you want to slide

 

I just find out about the 2D effectors, is there a way to use them in my case (just an idea)

 

Okay I understand, but I have troubles with the addforce (I really have poor knowledge about this):
First there is an inertia-like feeling, then I absolutely don't know how to rotate an object with addforce and I also don't know how to do a braking force.

Sorry to ask you so much, but could you help me ?

 

Hahahaha no I don't need you to do my job don't worry. I figured out a way, using addforce and slowing the tank with a linear drag of 20. Befor going further, is this a viable solution ?

 

Thank you so much !

 

Thanks, the solution works - I implemented slippery floors top-down by adjusting the player drag once it touches the slippery floor. One problem is that I have to adjust the force (if I reduce the drag, I also have to reduce the force that is applied when the player moves, to keep the speed the same). I don't have the exact formula, so it's done arbitrarily. Additionally, if the player is already moving fast before touching the slippery floor, it seems to move faster than expected (though I have to debug more carefully to see if it's really the case). I've also tried increasing the mass instead of reducing the speed, but couldn't get the slippery floor to feel perfectly good, other than just messing around with parameters and trial and error to try improve.