Rigidbody keeps sliding

Hi all, I have a standard cube with a rigid body attached and I cannot seem to stop it moving when its resting. It always slides slightly so that if I leave the game alone for a while it will move all the way over to the other side of the screen.

I have tried playing with the friction values etc with no luck. The platform the cube is on is completely flat.

 

Is there any script on the object that adds forces, etc?

 

I have the same problem

If you download the FPS Rigid Body example it comes with a demo of the Rigid bodys useage, and in the demo it automatically slides and its kinda old. Help

 

Try this.

In the rigid body.
Play around with its mass (try increasing it).
Try increasing its linear dampening (which is called drag I think).

Give it a physics materiel.

For the physics material
Sets its static and dynamic material to 1.0
Also set the friction combine parameter to use maximum.

 

to stay still
rigidbody.kinematic = true;
to move again
rigidbody.kinematic = false;

 

Don't do that unless you feel like constantly having to awaken rigidbodies from their kinematic state.

Also this thread is 4 years old so he probably found a solution already...

 

Maybe, but I have the exact same problem as the OP. In fact I have temporarily abandoned the game idea because of it. No mater what I did to the moving object and the resting surfaces the moving object would either wobble off or slide off. I tried huge mass, materials I even tried the turning off kinematic which worked best BUT the logic to try and decide when to do that made it temperamental.

So I too would like to know how best to achieve this. I have a great game just sat in a directory waiting for the answer.

 

I'm having the same trouble. This thread was started in 2009. It's 2013 now and still no answer to this widespread problem? A lot of projects have been abandoned for this rigidbody sliding and bouncing defect.

 

Yes I know this is a bit of a necro, but hey, someone resurrected this from 4 years in the grave so.....

I ran into this seemingly out of no where, and did a bit of searching then had a "DOH!" moment. Make sure that your rigid body isn't a Child of your camera, and the camera set to follow the ridigbody. This is what happened to me. I was organizing all my Levels "standard" objects into one game object, and accidentally made the character a child of the camera I setup to follow it. This will constantly "slide" your character based on the last movement speed.

Hope this helps someone

 

Figured this out.

Change the following settings in your projects physics settings.

Edit > Project Settings > Physics

Solver Iteration Count: at least 10 (I use 15)
Enable Adaptive Force: On (I turn this on, although it isn't necessary)

Hope this helps! ^_^

 

Hey, this works...!!!! Thanks a lot. Was stuck on this for hours.

 

Hi all, I know this is pretty old but, for anyone like me that may end up here, there is another thing you can try that I didn't find in the posts above.

So, if you are still here and nothing worked, check if you have <AnimationController> component attached to your object. If you have - disable it and try to run the game. If the issue disappears you should check and change the settings of your animations controller and/or animations!

It worked for me.

 

Hello all,

I had a similar problem with RigidBody objects. In my case, the problem was that the surface where the objects were resting had a MeshCollider, which for some reason was producing a slight sliding of the objects. Changing the collider of the surface to a simple BoxCollider fixed the problem.

I am not sure about the reason for this, but my guess is that the MeshCollider was overloading the physics engine with too many precise calculations, resulting in the sliding on the objects.

 

Hi all,
I made script for moving platforms, not by changing position, but moving it. This fixed sliding problem and moving is sinusoidal.

It worked for me.

 

I know this is super late however i ran into this problem as well and could not find the answer because none of the above worked for me so i keep searching and find an idea on how to fix this problem. and with that in mind this is what i came up with to fix it.
Hope it helps.

 

just increase the linear drag and increase the speed

 

I ran into this issue building the space shooter tutorial. I increased the drag to 10 and the speed to 200 and that solved my issue - thanks GGlio/ others who provided the same advice.

 

I think i have finally solved this. I was having the same issue and racking my brain about it. Turns out it was way too simpler. are you using the default 2d asset platforms? If so, the default 2d asset platforms have an attached collider set to be slippery, just turn that off.

 

I'd like to add my case just in case another developer has a similar problem like me:

If you have a gameObject with a spherical collider (e.g. with frozen x- and y- axes but the y axis remains unconstrained) and you got a 2d sprite on it which - like in my game project - is facing itself to the camera (via script), then your GO will slide after any movement IF you have no angular drag on the rigidbody component! Setting it to 1 eliminated that problem.

Here a picture to visualize the problem I had.

 

Had a problem like this in my 2D project. Figured I'd share what fixed my problem. Turns out if you set the rotation of an object with a script, and it collides with something, it can cause a velocity from the angular force. The fix is to enable the "Freeze Rotation" "Z" constraint on the Rigidbody2D with the rotation script.

Got this solution from reddit:
https://www.reddit.com/r/Unity2D/comments/333lif/trouble_stopping_movement_in_rigidbody2d/cqhb5kr/

 

If you are using a capsule or sphere collider, don't. Perform the movement on a box collider and if you still want to use a capsule/sphere collider afterwards, but ensure that the box collider is always covering the base of the character. I have found that the rotation is due to the friction on the ground.
Just don't use a capsule collider.

 

This is the oldest thread ever, lol. Anyway, I fixed the same problem rather quickly by using a physics material on both the ground and player where I then changed the friction on both. I remember having this problem like five years ago and it was reminiscent of the ice levels in almost every old school NES game; Battletoads, Mario 3, etc. Those were the days.

 

Adding those constraints you show in the picture fixed my problem. Thanks!

 

your plane on which rigidBody is resting has non uniform scale along x and z axis.

 

I know this is an old post but it's the first one that appears in Google when you search for the problem so I'm sharing my solution here.

Quick and easy: put gravity scale to 0 when the object is grounded, reset it to your like whenever it's not.

This has worked for me in 2D, haven't tested in 3D yet.

To find if the object is grounded I get the collisions and check normals, I'm using y > 0.5f because I don't want any sliding. I keep a list of all the floors the object is colliding with, adding and removing them as the object enters or leaves the collisions. When no floors are present I just assume it's either jumping or in free fall and reset gravity.

 

Alright so I just spent so many hours on this today and nothing above helped, but I figured out what my problem was:

I just had to change from using Input.GetAxis() to Input.GetAxisRaw()

Basically GetAxis is applying smoothing. Went through hell to figure this out, doing all kinds of tests and implementing the same things a ton of different ways, thinking it's crazy how my code has told it to teleport and stop and it keeps sliding after all buttons had been let go.

I never suspected the part that would be messing it up would be the "direction to move" variable.

 

Best Answer was increasing the linear drag. Thx <3

 

[¬º-°]¬

An option that worked for me (for a player controlled 2D object w/rigid body that kept sliding) was to alternate between a speed variable that is a positive integer value during desired movement, and a value of 0 (when needing to stop without sliding).

For example, assuming Speed is defined as a positive integer (such as 1, 2, etc...) and used in determining desired movement speed (while checking for key input, in Update() ):

//Movement

 if (Input.GetKeyDown("a"))

        {

            speedtmp = Speed;

...

//Movement Stop

 if (Input.GetKeyUp("a"))

        {

            speedtmp = 0;

...

The variable speedtmp can then be used in conjunction with the rigid body .MovePosition method, within FixedUpdate(), for determining rigid body position:

rigidBody.MovePosition(rigidBody.position + inputs * speedtmp * Time.fixedDeltaTime);

When speedtmp = 0 , this results in the above line of code also equaling 0, stopping the rigid body position at the current position (without sliding further).

 

I realize this question was posted in 2009, but for any one that needs help, I tried playing with the Angular Drag on the Rigidbody component. I set the value to 100 and it fixed my issue. Hope I help someone.

 

Same problem here. Trying lots of fixes. Still sliding.

This is inane.

Unity should chime in and offer a solution, asap.

 

This is the only answer, that solved my issue for 95%. But in my case I had to set not 10 or 15 but 50.
Thank you from 2019!

 

If you're not planning on having any outside forces moving the player horizontally (explosions, sloped angles where the player slides, etc.), you could do something similar to:

Code (CSharp):

1. if (!Input.GetKey(KeyCode.A) && !Input.GetKey(KeyCode.D)) {
2.     rb.velocity = new Vector2(0, rb.velocity.y);
3. }

 

Code (CSharp):

1.     public void Move()
2.     {
3.         playerGameObject.transform.forward = virtualJoystick.heading;
4.         thisRigidBody.transform.forward = virtualJoystick.heading;
5.         thisRigidBody.position += virtualJoystick.rightMovement * playerMovementSpeed * Time.deltaTime;
6.         thisRigidBody.position += virtualJoystick.upMovement * playerMovementSpeed * Time.deltaTime;
7.     }

This was triggered by the following (causing a slide, regardless of what settings i put in rigidbody)

Code (CSharp):

1.         if (virtualJoystick.heading != null)
2.         {
3.             Move();
4.  
5.         }

Changed to this and now works.

Code (CSharp):

1.         Vector3 MoveVector = virtualJoystick.heading;
2.         if (MoveVector != Vector3.zero)
3.         {
4.             Move();
5.         }

 

Thank you very much, this helped me alot! But i spent many hours, too.

 

I'll just add on to this, there's so many solutions but just turning off GravityScale (setting it to 0) for the sliding object worked for me.

 

After struggling with this for several hours here was how I fixed the issue:

Code (CSharp):

1. rigidBody.interpolation = RigidbodyInterpolation.None;
2. rigidBody.detectCollisions = false;
3. rigidBody.isKinematic = true;

It seems that Unity has a bug (or unwelcome "feature") that turning your rigidbody to kinematic still allows it to experience physics unless RigidBodyInterpolation is set to None. Even completely disabling colliders on your component does not help.

The worst part is the failures are silent and I only discovered this after desperately trying every single setting.

 

I have a rigidbody with a mass set to 15 and this problem occurred to me, I just set my linear drag from 0 to 30 and that fixed it.

 

you could remove the velocity from the player.

if(Input.GetKeyDown(KeyCode.D))
{
Vector2 playerVelocity = new Vector2(5f, myRigidbody.velocity.y);
myRigidbody.velocity = playerVelocity;
myAnimator.SetBool("IsRunning", true);
}
else
{
Vector2 playerVelocity = new Vector2(0f, myRigidbody.velocity.y);
myRigidbody.velocity = playerVelocity;
myAnimator.SetBool("IsRunning", false);
}

 

With the new unity 2019.3.1f1, the detectCollisions option is gone.

The "Edit > Project Settings > Physics > Solver Iteration Count:" is also gone. How would I go about stopping my kinematic rigidbody from sliding nowadays?

 

You can try to stop:

Code (CSharp):

1. rb.constraints = RigidbodyConstraints2D.FreezeAll;

For move again:

Code (CSharp):

1. rb.constraints = RigidbodyConstraints2D.FreezeRotation;

 

Hello everyone!!

Although, I do not post much, please allow me to submit the
following.

## 'The natural physics of Unity, are very 'slidy,' help!? ##

How do I eliminate Unnecessary sliding?

Remember also, sliding can be 'good' too!
Like jumping, or projectiles!! Very slidy.. yes.

Well...

if(player_moving)
{ player_rigidbody.drag=reasonableValue_forSliding; }
else /*player 'is not' moving*/
{ player_rigidbody.drag=reasonableValue_forStanding;}

This can be justified, as (people/living things)
have a tendency to 'seek ground,' aka drag,
aka friction & center of gravity.

public float dragForce_standing=10.0f;
// consider that this should always be greater than..
public float dragForce_moving=1.0f;
// something already in motion (inertia)
// would have less 'drag,' if it were applied
// this way

In terms of 'drag,' then, more force is applied, as less motion is happening; you might call this
behaviour, sort of, 'clingy.'

Anyway,

It appears that the default weight unit is kg, so my 102 kg
object, was easily calculated. Slide, not so much.

The end values were very high, for my purposes. So, do not
be afraid to reach 4, or even 5 digits. However, be true
to the 'weight' of your object, always.

I will not give specific settings, that's part of the fun. Be reasonable,
and pay attention, when adding force to the player.


Thank you.

-TE

 

Here

I came up with this today
(Reposted with 'drag over time')

Enjoy!


void preWalking()
{ sphere_rigidbody.drag=drag_moving;
drag_baseMult_current=0.0f;
drag_standingMult_current=0.0f;
}

public float drag_base=1.0f; // minimumSlideDrag
public float drag_multiple=0.01f; // multiple calc for base drag
public float drag_baseMult_current=0.0f;
public float drag_standingMult_current=0.0f;

void motionState()
{ if(!keypressed)
{ keypressed=false;
player_animation.speed=2.0f;
player_animation.SetInteger("animation",0);

if(!isGrounded)
{ sphere_rigidbody.drag=drag_moving; // regular motion drag
drag_baseMult_current=0.0f;
drag_standingMult_current=0.0f; }

else
{ if(drag_baseMult_current<1.0f) // increase drag, after releasing it
{ drag_baseMult_current+=drag_base*drag_multiple;
sphere_rigidbody.drag=drag_moving*(1.0f*drag_baseMult_current); }

else
{ Debug.Log("'Standing Current");

if(drag_standingMult_current<1.0f) // increase drag, after releasing it
{ drag_standingMult_current+=drag_base*drag_multiple;
sphere_rigidbody.drag=drag_standing*(1.0f*drag_standingMult_current); }
}
}
// Debug.Log("key not pressed");
}
}

 

This is for me the best answer so far, the only thing is because is in 2D you usually default froze the z rotation when you reactivate the rigidbody2D, you have to reference it twice (one for unfroze all and one to froze the z-axis).
Also, doing this how will affect the performances?

 

Litteraly just add a flat box collider to the bottom if you are using a capsule player. The rigidbodies dont like curved surfaces

 

This worked!!! Thank you!

 

Increasing the Linear Drag and Angular Drag worked for me.
Just imagining that a single bug has survived for 11 years is insane, this thread is from 2009.
Damn..

 

Where is linear drag?

 

On the rigidbody

 

All of the answers, this was the answer that made everything work. Thanks

 

Yep like Aeroxima said just change Input.GetAxix() to Input.GetAxisRaw().
Now its shuld work perfectly