Resolved Moving character on slopes with forces

Hi everyone!

I'm having problems with slopes in the movement system I'm currently working on.

The code uses forces to have a smooth movement with acceleration and deacceleration, as following:

Code (CSharp):

1.      public void OnFixedUpdate()
2.     {
3.         float targetSpeed = Vector2Int.RoundToInt(inputManager.moveAction.ReadValue<Vector2>()).x * player.playerMoveSpeed;
4.         float speedDifference = targetSpeed - player.playerRigidbody.velocity.x;
5.         float accelerationRate = (Mathf.Abs(targetSpeed) > 0.01f) ? player.playerAcceleration : player.playerDeacceleration;
6.  
7.         float movementForce = Mathf.Pow(Mathf.Abs(speedDifference) * accelerationRate, player.velocityPower) * Mathf.Sign(speedDifference);
8.  
9.         Vector2 moveDirection = -Vector2.Perpendicular(player.GetFloorHighestSensor().normal);
10.  
11.         player.playerRigidbody.AddForce(moveDirection * movementForce);
12.  
13.     }

To get the direction of movement, It casts a ray down and calculate the perpendicular from the normal of the point hitted, this way the player able to walk up and down slopes.

The behaviour I wish to avoid is a bump that happends when the player crosses the top of the slope.


Any ideas on how to implement this?

 

You know that forces are not necessary for smooth movement, right?

Smoothing movement between any two particular values:

https://forum.unity.com/threads/beginner-need-help-with-smoothdamp.988959/#post-6430100

You have currentQuantity and desiredQuantity.
- only set desiredQuantity
- the code always moves currentQuantity towards desiredQuantity
- read currentQuantity for the smoothed value

Works for floats, Vectors, Colors, Quaternions, anything continuous or lerp-able.

The code: https://gist.github.com/kurtdekker/fb3c33ec6911a1d9bfcb23e9f62adac4

 

Thanks! managed to find a solution. The code is the following:

Code (CSharp):

1.       public void OnFixedUpdate()
2.     {
3.        
4.         Vector2 moveDirection = -Vector2.Perpendicular(player.GetFloorHighestSensor().normal);
5.  
6.         float targetSpeed = Vector2Int.RoundToInt(inputManager.moveAction.ReadValue<Vector2>()).x * player.playerMoveSpeed * Time.deltaTime;
7.         float accelerationRate = player.playerAcceleration;
8.         float movementForce = Mathf.MoveTowards(Mathf.Abs(player.playerRigidbody.velocity.magnitude) * Mathf.Sign(player.playerRigidbody.velocity.x), targetSpeed, accelerationRate * Time.deltaTime);
9.  
10.         player.playerRigidbody.velocity = moveDirection * movementForce;
11.     }

For anyone that may take this as a base in the future, be sure to have long raycasts down, to avoid the player getting ungrounded when crossing corners.