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Question by SmileyFaceOfRom · Aug 21, 2012 at 11:38 PM · rigidbodystairsramp

Stop rigidbody from sliding down "stairs".

EDIT I added your suggestion and it stops me, but like you said, I get frozen. Now this next part of script allows me to see when my WASD buttons are being pressed, and it worked without any issues.

 if(!Input.GetButton("Horizontal"))
     {    
         //Debug.Log("There is no horizontal input.");
         if(!Input.GetButton("Vertical"))
         {    
             //Debug.Log("There is no Vertical input.");
             moveInput = false;
         }
     }    
     //If there IS WASD input, moveInput = true.
     if(Input.GetButton("Horizontal") == true)
     {    
         //Debug.Log("There IS horizontal input.");
         moveInput = true;
     }
     if(Input.GetButton("Vertical") == true)
     {    
         //Debug.Log("There IS vertical input.");
         moveInput = true;
     }    

This next part stops me just fine, but it won't let me restart.

 if(collision.gameObject.tag =="StairsPlane")
     {
         //Debug.Log("In contact w/stairs plane.");
         if(moveInput == false)
             rigidbody.constraints = RigidbodyConstraints.FreezePosition;
         else
             rigidbody.constraints = RigidbodyConstraints.FreezeNone;
     }


I'm using a rigidbody for my character. My stairs consist of a ramp that the character "walks up". My issue is that he slides down the ramp when I stop moving. Can anyone offer me some assistance on how to stop this?

PlayerMovementScript.js
var walkAcceleration : float = 5; var walkAccelAirRacio : float = 0.1; var walkDeacceleration : float = 5; @HideInInspector var walkDeaccelerationVolx : float; @HideInInspector var walkDeaccelerationVolz : float;

 var cameraObject : GameObject;
 var maxWalkSpeed : float = 20;
 @HideInInspector
 var horizontalMovement : Vector2;
 var jumpVelocity : float = 20;
 @HideInInspector
 var grounded : boolean = false;
 var maxSlope : float = 60;
 
 //crouching
 var crouchRacio : float = 0.3;
 var transitionToCrouchSec : float = 0.2;
 @HideInInspector
 var crouchVelocity : float;
 var currentCrouchRacio : float = 1;
 @HideInInspector
 var originalLocalScaleY : float;
 @HideInInspector
 var crouchLocalScaleY : float;
 @HideInInspector
 var crouchingSpeed : float;
 @HideInInspector
 var maxWalkSpeedOrig : float;
 
 //end crouching and collision detection
 var collisionDetectionSphere : GameObject;
 
 //switch guns
 @HideInInspector
 var waitFrameForSwitchGuns : int = -1;
 var currentGun : GameObject;
 var distToPickUpGun : float =6;
 var throwGunUpForce : float = 100;
 var throwGunForwardForce : float = 300;
 
 //Pickup Ammo
 @HideInInspector
 var waitToPickupAmmo : float = 0;
 
 //Position for AIPathCell
 var currentCell : GameObject;
 
 
 function Awake ()
 {
     maxWalkSpeedOrig = maxWalkSpeed;
     currentCrouchRacio = 1;
     originalLocalScaleY = transform.localScale.y;
     crouchLocalScaleY = transform.localScale.y * crouchRacio;
     crouchingSpeed = maxWalkSpeed / 10;
 }
 
 function Update () 
 {
     waitFrameForSwitchGuns -= 1;
     waitToPickupAmmo -= Time.deltaTime;
     
     transform.localScale.y = Mathf.Lerp(crouchLocalScaleY, originalLocalScaleY, currentCrouchRacio);
     if(Input.GetButton("Crouch"))
         currentCrouchRacio = Mathf.SmoothDamp(currentCrouchRacio, 0, crouchVelocity, transitionToCrouchSec);
         maxWalkSpeed = crouchingSpeed;
         
     if(Input.GetButton("Crouch") == false && collisionDetectionSphere.GetComponent(CollisionDetectionSphereScript).collisionDetected == false)
         currentCrouchRacio = Mathf.SmoothDamp(currentCrouchRacio, 1, crouchVelocity, transitionToCrouchSec);
         maxWalkSpeed = crouchingSpeed;
     if(!Input.GetButton("Crouch"))
         maxWalkSpeed = maxWalkSpeedOrig;
 
     horizontalMovement = Vector2(rigidbody.velocity.x, rigidbody.velocity.z);
     if (horizontalMovement.magnitude > maxWalkSpeed)
     {
         horizontalMovement = horizontalMovement.normalized;
         horizontalMovement *= maxWalkSpeed;
     }
     rigidbody.velocity.x = horizontalMovement.x;
     rigidbody.velocity.z = horizontalMovement.y;
     
     if (grounded){
         rigidbody.velocity.x = Mathf.SmoothDamp(rigidbody.velocity.x, 0, walkDeaccelerationVolx, walkDeacceleration);
         rigidbody.velocity.z = Mathf.SmoothDamp(rigidbody.velocity.z, 0, walkDeaccelerationVolz, walkDeacceleration);
     }
     
     
     transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(MouseLookScript).currentYRotation, 0);
 
 //Is jumping, less movement control
     /*
     if(grounded)    
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * Time.deltaTime);
     else
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRacio * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRacio * Time.deltaTime);
     */
     
     if(Input.GetButtonDown("Jump") && grounded)
         rigidbody.AddForce(0, jumpVelocity,0);
 }
 
 function FixedUpdate ()
 {
     if(grounded)    
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration, 0, Input.GetAxis("Vertical") * walkAcceleration);
     else
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRacio, 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRacio);
     
 }
 
 
 function OnCollisionStay (collision: Collision)
 {
     for (var contact : ContactPoint in collision.contacts)
     {
         if (Vector3.Angle(contact.normal, Vector3.up) < maxSlope)
             grounded = true;
     }
 }
 
 function OnCollisionExit ()
 {
  grounded = false;
 }
 
 
 function OnTriggerStay (hitTrigger : Collider)
 {
 //Set current cell for Ai pathfinding
     if(hitTrigger.tag == "AIPathCell")
         currentCell = hitTrigger.gameObject;
 
 //Handles stairs up & down
     if (hitTrigger.transform.tag == "StairGoingUp")
 
         if (!Input.GetButton("Jump") && Vector3.Angle(rigidbody.velocity, hitTrigger.transform.forward) < 90)
 
             if (rigidbody.velocity.y > 0)
 
                 rigidbody.velocity.y = 0;
 
     if (hitTrigger.transform.tag == "StairGoingDown")
 
         if (!Input.GetButton("Jump") && Vector3.Angle(rigidbody.velocity, hitTrigger.transform.forward) < 90)
 
             rigidbody.AddForce(0,-100,0);
 
 

}

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Answer by OperationDogBird · Aug 22, 2012 at 12:27 AM

You could use rigidbody restraints for the position while there is no input. Something like

 if(!moveInput)rigidbody.contraints=RigidbodyConstraints.FreezePosition;

you could make it only for stairs by adding an isTrigger area on the stairs. You need to make sure to unfreeze once there is input, otherwise you will be locked in position.

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avatar image BindingForceDev · Feb 18, 2016 at 10:24 PM 0
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Thanks for this suggestion! Here is the code I used to stop sliding movement, while still using it's advantages. Basically moving is true if there is input from the user, ai controlled movement, or movement effects from abilities... This code allows the player to be affected by the terrain collider when moving, so slopes are still harder to climb without a high movement velocity.

 if (moving) {
     gameObject.GetComponent<Rigidbody>().constraints = RigidbodyConstraints.None;
     gameObject.GetComponent<Rigidbody>().constraints = RigidbodyConstraints.FreezeRotation;
 } else {
     gameObject.GetComponent<Rigidbody>().constraints = RigidbodyConstraints.FreezeAll;
 }

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