[Solved] Faux Gravity (Spherical Gravity) Movement

Firstly thank you for taking your time to read this.
Basically I have two scripts used to create faux gravity (spherical gravity).
One for the planet the player will be attracted to:

Code (csharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class FauxGravityAttractor : MonoBehaviour
6. {
7.  
8.     public float gravity = -1;
9.     public void Attract(Transform body)
10.     {
11.         Vector3 gravityUp = (body.position - transform.position).normalized;
12.         Vector3 bodyUp = body.up;
13.  
14.         body.GetComponent<Rigidbody>().AddForce(gravityUp * gravity);
15.         Quaternion targetRotation = Quaternion.FromToRotation(bodyUp, gravityUp) * body.rotation;
16.         body.rotation = Quaternion.Slerp(body.rotation, targetRotation, 50 * Time.deltaTime);
17.  
18.     }
19. }

and the other is for the object that the gravity it affecting:

Code (csharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class FauxGravityBody : MonoBehaviour
6. {
7.     public FauxGravityAttractor attractor;
8.     private Transform myTransform;
9.  
10.  
11.     void Start()
12.     {
13.         GetComponent<Rigidbody>().constraints = RigidbodyConstraints.FreezeRotation;
14.         GetComponent<Rigidbody>().useGravity = false;
15.         myTransform = transform;
16.     }
17.  
18.  
19.     void Update()
20.     {
21.         attractor.Attract(myTransform);
22.     }
23. }

I was wondering how to create Player Movement as ones that I have found don't work, or make the movement look weird. Bare in mind this is for a vehicle moving around the planet, therefore it needs to turn rather than just strafe which is why:

Code (csharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerController : MonoBehaviour
6. {
7.     public Rigidbody rb;
8.  
9.     public float MoveSpeed= 1f;
10.  
11.     public float sidewaysForce = 5f;
12.  
13.  
14.  
15.    
16.     void Update()
17.     {
18.         Vector3 moveDir = new Vector3(
19.             Input.GetAxisRaw("Horizontal") * MoveSpeed * Time.deltaTime,
20.          
21.             Input.GetAxisRaw("Vertical") * MoveSpeed * Time.deltaTime);
22.  
23.      
24.             transform.Translate(moveDir * MoveSpeed);
25.     }
26. }

doesn't work. Additionally It causes the car to fly off the planet. The movement speed needs to be a variable as well as being constantly applied to the car as its not meant to stop.
Thank you again if your read this far.

 

On a spherical object, you cannot make the move direction the sameas the global up and forward. Rather, you need to make it based on the object's (local) forward and right:

Code (CSharp):

1. // move forward
2. Vector3 fw = transform.forward * Input.GetAxis("Horizontal") * MoveSpeed * Time.deltaTime;
3. // move lateral
4. Vector3 lateral = transform.right * Input.GetAxis("Vertical") * MoveSpeed * Time.deltaTime;
5.  
6. // put it together
7. transform.Translate( fw + lateral);

Note also that you are multiplying the move vector with MoveSpeed twice, once moderated by delta time, and thenagain unmoderated in translate.

 

Thanks for the reply however I tried this and it creates a weird movement pattern, where it moves diagonally, and then stops moving and tries to push through the planet.

Any other suggestions?

 

Is there a way to add a force based on local axis? or can that code be tweaked to work on the x and z planes rather than W making the player go upwards/downwards?

 

For any one who was wondering turns out there is an example of a car driving on the x-z plane here: https://docs.unity3d.com/ScriptReference/Input.GetAxis.html