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How to prevent ragdoll parts from stretching apart?

I have a video demonstrating my problem: https://www.youtube.com/watch?v=R_8TIfs_5Ag&feature=youtu.be

At low velocities, the PhAT behaves perfectly. At higher velocities, the parts can't seem to keep up with the others.

In context, we're making a game where you play as a giant who can throw peasants. The throw is implemented but the peasant "stretchiness" looks bad. I have a video of that as well:


EDIT: Increasing damping didn't seem to help. I've also tried using the "Projection" checkbox to no avail. (It's description looks like it would solve the problem but it makes things worse.) alt text

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asked Mar 07 '15 at 10:48 PM in Using UE4

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avatar image Blue669 May 31 '15 at 10:44 AM

Hey. Did you find a fix for this? I'm having the same issue.

avatar image SheenDinner May 31 '15 at 06:54 PM

We never got it to be perfect, but I went through and really made sure all of the individual joints had correct ranges of motion. Then we just lowered our throw speed and hid the initial stretching somewhat behind the player's camera.

We recently upped the speed in this video: https://www.youtube.com/watch?v=srn3ZaoqY40 and it looks okay at certain throw angles, but otherwise we're still getting the problem.

I fixed the second link in my original question. If you click that you can compare it to our newer throw. I think the animation helps mask the bug a lot.

avatar image Stay21 Jan 12 '17 at 07:01 AM

Hey. Did someone find a fix for this now ? I also have the same issues

avatar image tsuzumi Apr 08 '17 at 03:45 PM

Can we please get some response from the developers, or someone else who knows, on how to prevent this? It looks horrible on smaller parts like hair.

avatar image A.SISODIYA Nov 05 '17 at 06:24 PM


avatar image mightyenigma Nov 06 '17 at 06:37 PM

In Box2D they say you can fix this problem sometimes by increasing the mass or density of the parts, or something like that. Is your giant actually a normal-size humanoid, throwing very small humanoids? Might be worth a try to make the player character actually bigger (physics probably will respond differently) and make the little people actually normal sized),and see if that separate experiment project responds better.

Not sure if that will help, or maybe it's just a matter of "physics scale"

avatar image Max974 Nov 28 '17 at 11:00 AM

Hello, I'm having the same problem in 4.18.1. Limited or Locked constraint doesn't change anything! yesterday, I wanted to show the behavior to a friend of mine, and it MAGICALLY worked! Today, it won't work anymore. I'm really raging against this!

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In my case, this issue occurs when i add new bone inside Persona. If i don't add new bone, everything is good. When i have skeleton and i need to add new bone, first i create new physicsAsset in content browser and check "Create Bone for each bones" (just right click on Model and Create PhysicAsset). Then the issue doesn't occur and i can adjust and delete unnecessary bones. This works in my case.

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answered Nov 28 '17 at 11:54 AM

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avatar image Max974 Nov 28 '17 at 11:56 AM

By bone you mean body?

avatar image Stay21 Nov 28 '17 at 12:32 PM

Yes. bone=body. Sorry - habit from Maya.

avatar image Max974 Nov 28 '17 at 01:15 PM

Okay, it seems that your technique works. I generated a new physics asset, with "Create Body for each bones" checked and unchecked "Limits" to not have constraint. I created the constraints by myself and it works. At least it doesn't go crazy by exploding everywhere.

avatar image Stay21 Nov 28 '17 at 01:43 PM

Good to hear that :)

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