How to jump when player is upside down in a spherical world, using FauxGravity? - unity3d

Question

What I try to do
I'm trying to get jumping working all over the sphere and not just at the top while using FauxGravity.
How it works currently
My character jumps correctly when he is on top but when he is in the bottom of the sphere the jump doesn't take place.
FauxGravityAttractor
[SerializeField] private float gravity = -9.81f;
public void Attract(Rigidbody body) {
Vector3 gravityUp = (body.position - transform.position).normalized;
Vector3 localUp = body.transform.up;
// Apply downwards gravity to body
body.AddForce(gravityUp * gravity);
// Align bodies up axis with the centre of planet
body.rotation = Quaternion.FromToRotation(localUp,gravityUp) * body.rotation;
}
FauxGravityBody
FauxGravityAttractor planet;
new Rigidbody rigidbody;
void Awake()
{
planet = GameObject.FindGameObjectWithTag("Planet").GetComponent<FauxGravityAttractor>();
rigidbody = GetComponent<Rigidbody>();
// Disable rigidbody gravity and rotation as this is simulated in GravityAttractor script
rigidbody.useGravity = false;
rigidbody.constraints = RigidbodyConstraints.FreezeRotation;
}
void FixedUpdate()
{
// Allow this body to be influenced by planet's gravity
planet.Attract(rigidbody);
}
Sample Jumping
void Jump()
{
if(Input.GetKeyDown(KeyCode.Space) && isOnGround)
{
rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
isOnGround = false;
}
}
private void OnCollisionEnter(Collision collision)
{
if(collision.gameObject.CompareTag("Planet"))
{
isOnGround = true;
}
}

Answer 1

FauxGravity jumping problem solved
All you need to do is AddRelativeForce to your rigidbody
Read more about RelativeForce
// JUMPING
private void Jump()
{
if (Input.GetKeyDown(KeyCode.Space) && onGround)
{
rb.AddRelativeForce(0, forceConst, 0, ForceMode.Impulse);
onGround = false;
}
}