Raycast hits and then doesn't fire again? 2D Game Raycasting Problem

Question

Hi,

My issue involves rotating a 2D player sprite's z axis to match the slope incline they're walking on. Essentially I want them to stand up "straight" relative to the ground, rather than the world Y axis, when standing on any point of the inside edge of a circle.

For this I'm trying to use a raycast to return the ground normal and then match the transform.up to this normal.

I wanted to setup a raycast2d which would fire from the base of the player sprite to return new normal data everytime it hits so that when the player moves, they are constantly changing z rotation to match the normal, HOWEVER, the ray seems only to fire until it detects a hit; meaning that it sets the player's new z axis to whatever normal it first collects, then doesn't try to check again - despite being in Update(). This obviously leaves the player sprite at an odd and unchanging angle.

Code:

void Update() {

     if (Input.GetAxis("Horizontal") != 0)
     {
         rb.velocity = new Vector2(Input.GetAxis("Horizontal") * moveSpeed, rb.velocity.y);    
     }

     if (Input.GetAxis("Horizontal") < -0.1)
     {
         mySpriteRenderer.flipX = true;
     }

     if (Input.GetAxis("Horizontal") > 0.1)
     {
         mySpriteRenderer.flipX = false;
     }

         RaycastHit2D hit = Physics2D.Raycast(origin, Vector2.down, 5.0f);
        // Debug.DrawRay(origin, Vector2.down, Color.red, hit.distance);
         transform.up = hit.normal;

}

Please can anyone help?

(I'm pretty new to this so apologies if this is a ridiculous question for whatever reason :L)

Answer 1

Best Answer

Answer by Roger_0123 · Mar 10, 2020 at 04:01 PM

Hello, transform.up does not change object orientation. Looking at your code, after calculating hit.normal you need to rotate 90 degrees clockwise in order to get the correct looking direction. I link this answer in order to achieve this, but this should work:

 Vector3 direction =  Quaternion.Euler(0, 0, -90) * hit.normal;
 /*Don't know if this will rotate clockwise, in case try +90 degrees.
 After that, use LookRotation*/
 transform.rotation = Quaternion.LookRotation(direction, Vector3.forward) //or backward?

Quaternion.LookRotation:

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Raycast hits and then doesn't fire again? 2D Game Raycasting Problem

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