Magnet street - How car object can follow the street in real world physic

Good evening everyone. As you can see from the image I would like to make sure that my car was able to travel this road by making this 360-degree turn while remaining glued to the asphalt. could anyone suggest me which approach to use and / or which script achieves this effect?

 

You can disable gravity in the car's rigidbody and apply the gravity force via AddForce in the direction of the road.

Code (CSharp):

1. rigidbody.AddForce(gravityDirection * 9.81f, ForceMode.Acceleration);

Here you would need to calculate gravityDirection as the normalized "down" direction with respect to the road.

PS. I love that stunt. The only game I know that includes it is the good old Fatal Racing for PC. I *think* it could be done without gravity tricks if the car travels it at enough speed in a precise direction. Testing it in Unity with a proper simulation is one of my pending tasks

How did you modeled the track? Some asset, or directly in a 3D tool?

 

Thank you so much for the advice. Having such a tight propeller and little space to apply it let's say I can't help but take the gravity out (even if the game has real physics). As for the track I started from these assets https://assetstore.unity.com/packages/3d/vehicles/land/simple-racer-cartoon-assets-37490 but I am doing a lot of things using Blender. For example, this screw is not part of the package and I made it myself with very little knowledge of Blender.

I finally solved the problem by writing this short script for my machine and I have to tell you that it works really well

Code (CSharp):

1.     void AttractorCheck()
2.     {
3.         int layerMask = 1 << 8;
4.  
5.         layerMask = ~layerMask;
6.  
7.         RaycastHit hit;
8.         if (Physics.Raycast(RayCastTransf.position, transform.TransformDirection(Vector3.down), out hit, 5, layerMask) && hit.transform.CompareTag("AttractionLayer"))
9.         {
10.             Debug.DrawRay(RayCastTransf.position, transform.TransformDirection(Vector3.down) * hit.distance, Color.yellow);
11.             _rb.useGravity = false;
12.             ApplyStabilizer(hit.normal);
13.             _rb.AddRelativeForce(Vector3.down * 10000 * attractionSpeed * Time.fixedDeltaTime);
14.  
15.         }
16.         else
17.         {
18.             Debug.DrawRay(RayCastTransf.position, transform.TransformDirection(Vector3.down) * 5, Color.white);
19.             _rb.useGravity = true;
20.             ApplyStabilizer(Vector3.up);
21.         }
22.     }

 

If I can exploit your answer and this psot I want to ask you what is the best way for you to turn left and right with the car, I am having a lot of problems because I can't find the nicest way to move the car. right now my approach is to evaluate a function based on horizontal key presses, only the effect is not that great. Do you have any proposals for scripts to use? I leave you below mine:

Code (CSharp):

1. [SerializeField] AnimationCurve turnInputCurve = AnimationCurve.Linear(-1.0f, -0.3f, 1.0f, 0.3f);
2.  
3.     void FixedUpdate()
4.     {
5. steering = turnInputCurve.Evaluate(GetInput(turnInput)) * steerAngle;
6.  
7.         // Direction
8.         foreach (WheelCollider wheel in turnWheel)
9.         {
10.             wheel.steerAngle = Mathf.Lerp(wheel.steerAngle, steering, steerSpeed);
11.         }
12.  
13. }

 

Thank you for the info!

Hint: you can replace "trasform.TransformDirection(Vector3.down)" with "-transform.up".

I'd simply use:

Code (CSharp):

1. wheel.steerAngle = Input.GetAxis("Horizontal");

Then I'd configure the Horizontal input in the Input Manager. Here's a setup that works pretty good to me:
https://evp.vehiclephysics.com/faq/#how-to-configure-the-input-parameters

 

Nice!
I had some luck with a "magnetic flying cube" by changing the global Physics.gravity (in your case, I guess, to the normal of the centreline of the road):
https://twitter.com/biscuitsmitten/status/1309220478255497216
Hmm, thinking about it, for proper glue, I guess maybe I'd need to increase the gravity magnitude too.
Well, you anyway have a solution and your game looks great

 

If anyone is here in the future, I wanted to share the package with the solution to the problem. All can be downloaded easily from my personal GitHub.

https://github.com/ArcaDone/CarControllerUnity3D