Character getting stuck on walls

Question

Hey,

I have a weird issue where if I jump and hold the movement direction key of the direction I'm jumping in - the character just sticks to the wall. Only when I let go of the movement control, my character stops sticking to the wall. So is there a solution to this? From what I've read, I tried messing around with physical material - and had no luck. It was also suggested that i use Addforce, but the movement speed is too slow- so not desirable.

 using System.Configuration;
 using System.Runtime.InteropServices;
 using UnityEngine;
 using System.Collections;
 
 public class TouchControlManagerWithJump : MonoBehaviour
 {
 
     public GameObject leftController;
     public GameObject rightController;
     public GameObject jumpController;
     public GameObject playerFinder;
 
 
     // Use this for initialization
      void Start()
     {
         //We assign Left and Right GuiTextures to leftController and rightController
         leftController = GameObject.Find("Left");
         rightController = GameObject.Find("Right");
         jumpController = GameObject.Find("Jump");
     }
 
      void FixedUpdate()
     {
         //We assign our main player to playerFinder
         playerFinder = GameObject.Find("pig_test");
 
 
         //Here we create a variable that checks if the player is grounded
         var groundCollisionDet = playerFinder.GetComponent<PlayerGroundDetector>().playerIsGrounded;
 
         //Creating touch controls
         if (Input.touches.Length > 0)
         {
             for (int i = 0; i < Input.touchCount; i++)
             {
                 //setting right touch movement
                 var touch = Input.GetTouch(i);
                 if (this.rightController.guiTexture.HitTest(Input.GetTouch(i).position))
                 {
                     if (touch.phase != TouchPhase.Ended && touch.phase != TouchPhase.Canceled)
                     {
                         if (groundCollisionDet == true)
                         {
                             /*  
                             old controls with acceleration
                             playerFinder.rigidbody.AddForce(Vector3.right*10, ForceMode.Acceleration);
                             playerFinder.rigidbody.velocity = Vector3.ClampMagnitude(playerFinder.rigidbody.velocity, 10f);
                             */
 
                             //Create a vector 3 and attach playerfinder's rigidbody.velocity to it. Giving it a value.
                             Vector3 playerRight = playerFinder.rigidbody.velocity;
                             playerRight.x = 3;
 
                             //Assigning playerRight to playerfinder
                             playerFinder.rigidbody.velocity = playerRight;
 
                             //Player faces the direction it's moving
                             playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.left);
 
 
                         }
 
                         else if (groundCollisionDet == false)
                         {  
                             Vector3 playerRightAir = playerFinder.rigidbody.velocity;
                             playerRightAir.x = 3;
                             playerFinder.rigidbody.velocity = playerRightAir;
                             
                              
                             playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.left);
                             //playerFinder.rigidbody.AddForce(Vector3.right * 5, ForceMode.Acceleration);
                            
 
                         }
 
 
                     }
 
 
                     else if (touch.phase == TouchPhase.Ended)
                     {
                         playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.forward);
 
                     }
 
                 }
 
                 else if (this.leftController.guiTexture.HitTest(Input.GetTouch(i).position))
                 {
                     if (touch.phase != TouchPhase.Ended && touch.phase != TouchPhase.Canceled)
                     {
 
                         if (groundCollisionDet == true)
                         {
                             //We do the same here but this time we use '-3' so the player goes the opposite way
                             Vector3 playerLeft = playerFinder.rigidbody.velocity;
                             playerLeft.x = -3;
                             playerFinder.rigidbody.velocity = playerLeft;
 
                             playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.right);
 
                         }
 
                         else if (groundCollisionDet == false)
                         {  
                             Vector3 playerLeftAir = playerFinder.rigidbody.velocity;
                             playerLeftAir.x = -3;
                             playerFinder.rigidbody.velocity = playerLeftAir;
                             
                             //playerFinder.rigidbody.AddForce(Vector3.left*5, ForceMode.Acceleration);
                             playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.right);
                         }
 
                     }
 
                     else if (touch.phase == TouchPhase.Ended)
                     {
 
                         playerFinder.rigidbody.rotation = Quaternion.LookRotation(Vector3.forward);
 
                     }
                 }
 
                 
 
 
                 else if (this.jumpController.guiTexture.HitTest(Input.GetTouch(i).position))
                 {
 
                     if (touch.phase != TouchPhase.Ended && touch.phase != TouchPhase.Canceled)
                     {
                         if (groundCollisionDet == true)
                         {
                             Vector3 playerJump = playerFinder.rigidbody.velocity;
                             playerJump.y = 4;
                             playerFinder.rigidbody.velocity = playerJump;
 
 
                         }
 
                     }
 
                 }
 
 
             }
 
 
         }
 
 
 
 
 
     }
 }

Answer 1

Best Answer

Answer by TurboHermit · Feb 28, 2014 at 12:06 PM

This is a common problem and could be solved multiple ways. What happens is that the force you add in left/right movement is greater than your gravity, resulting in your character being squashed to the wall instead of to the floor.

What I do in many of my platformers is I check if my character is 'walled' as you would check if he's grounded to jump. So if he's actually touching a wall on either side of his body I disable the movement key of that side. I do this via Collision checks, because most of my blocks already have different collision for each side. But you could also do this via Raycasting.

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bruu · Feb 28, 2014 at 12:23 PM 0

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So pretty much (in pseudocode)

If (if raycastHittingwall && playerNotGrounded)

{ //disable this movement

}

So i would have two raycasts shooting out? One from back and the other from the front of the player?

TurboHermit · Feb 28, 2014 at 01:34 PM 0

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Depends if your player 'rotates' by which I mean, if the player is always facing the way you want to move in you only need one ray that checks directly in front of him. If he's facing a wall close-up you disable the ability to move 'forward'.

However if your player can walk both ways without facing any direction in particular, you should indeed raycast two seperate rays and disable that directions movement respectively.

bruu · Feb 28, 2014 at 05:04 PM 0

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$$anonymous$$y character does rotate, but it doesn't seem like the raycast rotates with the player.

seansteezy · Jul 14, 2014 at 01:10 PM 0

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Thanks @Danzou, a simple solution to a simple problem I was having (in the Unity 2D Demo game no less). Beautiful.

Answer 2

Answer by Simeon · Mar 17, 2016 at 02:58 PM

This might be a bit late, but I've had the same Issues and I tried adding the force needed to push the colliding objects apart. This can be done just by adding the Impulse force in Collision.impulse in the OnCollisionStay method. Like so:

 void OnCollisionStay(Collision collision)
     {
         bool isGround = false;
         foreach (ContactPoint contactPoint in collision.contacts)
         {
             if (Vector3.Angle(Vector3.up, contactPoint.normal) < maxSlopeAngle)
             {
                 isGround = true;
                 grounded = true;
                 maxVelocityChangeSmooth = maxVelocityChange;
             }
         }
 
         if (!isGround)
         {
             Debug.Log(collision.impulse);
             rigidBody.AddForce(collision.impulse, ForceMode.Impulse);
         }
     }

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Character getting stuck on walls

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