How can i prevent ragdolls from stretching and spazzing out?

I've made a ragdoll teddybear. I used the ragdoll wizard a little initially to see how it works, but it wouldn't take an armature with only 7 bones, so i ultimately made this myself, with colliders, rigidbodies, and character joints, on each part.

As long as i move this little guy around slowly, and don't get him caught on things, he's fine;



But if i move him too fast, or swing him around in a way that part (not all) of him hits an object, bad things happen.



My best guess at what's happening here, is that high forces are sending the limb rigidbodies flying, and they get caught on something in the scene, preventing them from coming back.

But i don't understand HOW this can happen. The character joints have a breakforce set to infinity, so surely that should prevent them from going any distance from their starting point, no matter how much force they're under?

The right leg in this case flew about 100m and got stuck behind a little hill in the distance.

Probably relevant, here's the full inspector readout for that right leg (most of these values are just defaults)

 

I am struggling with the same issue for days. I've tried everything and there is no fix other than limiting ragdoll speed!

Ragdolls are broken and extremely unstable in Unity 5.

 

I've found a solution which seems to work perfectly now. Enable projection on the character joints.

default settings just magically made the problem go away.

 

thanks Nanako,your help work for me

 

Tried this and it worked like a charm for me. Thanks for the post!

 

I could be wrong, but I'm pretty sure this is a collision issue. I've had a similar issue with ragdolls, and the issue ended up being resolved by working out layer collisions in Edit->Project Settings->Physics

 

None of these works in high speed collision impact, setting max depentration velocity helps, but it would cause some other issues, such as ignore collision impact.

 

Ragdolls don't normally behave the best when paired with high velocity.

 

Thanks Nanako. It worked fine for me.

 

Thanks Nanako. It working fine.

 

Thanks @nanako.693001, I was able to use your enabling option.... saved me tons of work.

 

Thanks Nanako, According to Unity's manual: Joint and Ragdoll stability

 

How do you enable character joints . I am also having this stretching issue with my character

 

thank you so much it worked for me

 

How did you get this to work? I do not see where to enable projection

 

@joeyether40 see the below image

 

i was using Configurable joints and that joint did not have that setting. I switched to character joint and used that and now no stretching ty

 

You are a legend. Works like a charm. So far. Need to test the collisions now. Cheerio

 

Uou, that is what I was looking for so long... Thank you very much!

 

5 years later and @Nanako solution still works great with the 2020 alpha, I was having issues where unity was crashing because my ragdoll was flying out of bounds/at too high velocities due to spaghettification glitches, this fully fixed it

 

Works for me in 2019.3.7f1) Thank you very much!

 

@Nanako solution worked like a charm, but needs a litlle bit tweaking for my purpose

However, In my case streching still occured a little bit, althought it isn't as bad as before.
so, if you really-really need to eliminate streching at all cost, don't forget to set the Projection Distance to 0.01 or lower.

That's how i deal with my streched ragdoll's neck

 

@Nanako thanks man, some days later I have found your solution. So simple and the still the best aproach.

 

Brother This Solution Works the Best at High Speed in 2022. And Bundle of thanks to you .. INSHALAH.. May Allah Bless you with Success..

 

I set defaultSolverIterations and defaultSolverVelocityIterations to 30 and it helped at high speeds. But the question remains is it optimized?... EDIT: it helped but not completely.

 

Nothing seems to be working and when the ragdoll arm stretches the entire chain starts flipping out. I have tried all suggestions in this thread. Even using character joints still results in ragdoll flipping out when the arm is stretched slightly. Is there any solution?

 

thanks work perfect

 

Physx is pretty stable in simulation. If you're having joint stretch then you're applying way too much force to the joints. Projection is not the solution.

 

Thanks nanako works not perfectly but something is better than nothing

 

Unity - Manual: Joint and Ragdoll stability (unity3d.com) read this documentation may be you can find solution for your specific task

 

This does not apply to my application, and you give no solution. Simply asking user not to stretch the ragdoll is not a viable solution and does not answer the question. Physx is good but "stable in simulation" is pretty vague.

Thanks, I read that article the very first day I noticed the issue. Nothing mentioned in the document solves the joint singularity infinite force issues unfortunately.

Only solution I can find is to use linear functions to project the target coordinates and limit the radius, which is working but is not ideal and CPU intensive!

--

P.S. Please don't lock this thread because of some disagreements. ragdoll stretching glitch in Unity seems to be a ongoing issue and more discussion/solutions are needed.