How to Handle Slopes in 2D Platformers?

Question

I haven't found a ton of useful information on this so far, so I'm just going to put this question out there. What's the best way to ensure that

1) My character's local y axis is always perpendicular to the ground underneath them, and 2) My character won't be pushed downwards by gravity while standing on a downward angled slope

Any kind of help on this is greatly appreciated

Answer 1

I found an answer deep in the bowels of google that gives me the slope information i need, and it looks like this:

 RaycastHit2D[] hits = new RaycastHit2D[2];
         int h = Physics2D.RaycastNonAlloc(transform.position, -Vector2.up, hits,3.5f,myMask); //cast downwards
         if (h > 1) { //if we hit something do stuff
             
             angle = Mathf.Abs(Mathf.Atan2(hits[1].normal.y, hits[1].normal.x)*Mathf.Rad2Deg); //get angle
 
             Debug.Log (angle);
 
         }

This gets you the angle of the slope against the player's up vector. So if I want my character to rotate to be perpendicular to the slope, I just have to make my character's rotation plus the angle equal 90. I'm going to paste the code I have in just a sec, but for some reason, if the desired rotation is negative, it just breaks my code and I really don't understand why. My character just keeps spinning clockwise and it makes no sense

 if (myGroundCheck.GetComponent<GroundCheckScript> ().isGrounded) {
             targetRotation = angle - 90;
         } else if (!myGroundCheck.GetComponent<GroundCheckScript> ().isGrounded) {
             targetRotation = 0;
         }
 
 
 
         if (transform.rotation.eulerAngles.z < targetRotation) {
             //if our rotation is less than the target rotation, add up to it
             Vector3 tempRot = transform.rotation.eulerAngles;
             tempRot.z += correctionRate * Time.deltaTime;
             tempRot.z = Mathf.Clamp (tempRot.z, -slopeLimit, targetRotation);
             transform.rotation = Quaternion.Euler(tempRot);
 
         } else if (transform.rotation.eulerAngles.z > targetRotation) {
             //if our rotation is more than the target rotation, subract down to it
             Vector3 tempRot = transform.rotation.eulerAngles;
             tempRot.z -= correctionRate * Time.deltaTime;
             tempRot.z = Mathf.Clamp (tempRot.z, targetRotation, slopeLimit);
             transform.rotation = Quaternion.Euler(tempRot);
         }

How to Handle Slopes in 2D Platformers?

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