Instantiated ragdoll behaves differently than when placed in scene manually

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Question: Why does my ragdoll behave differently when instantiated versus when it's placed in the world at authortime?

Details: I have a rigged ragdoll model of a dog that is stored in a prefab. I did not use the Ragdoll Wizard to set its joints as it seems like it's geared toward human ragdolls. So I added character joints manually and set the properties according to a reference I found on dog locomotion. The dog skeleton is composed of 29 rigidbodies/character joints each with a mass of 1. The root object also has a rigidbody attached and I have its mass set to 29 -- the sum of the masses. (Setting the mass of the root rigidbody to something low ironically makes the dog very heavy while setting the masses of the joints to something low causes the dog to go into freakish convulsions so it seems that these are the only settings that work as far as masses go).

The problem I have is that when I place the dog prefab manually into my object hierarchy at authortime and set him loose with gravity, his joints do bend with the proper degree of fluidity and twist/swing range that I specified. However, when I instantiate the dog using var newDog = Instantiate(ragdoll_dog, position, rotation), he falls like a rubber duck -- way too loose! What might be going on here?

Appreciate any insights. I can't seem to figure this one out.

Answer 1

Answer by runevision · Mar 18, 2010 at 11:14 AM

This should not be the case.

Can you try to record a video using Jing or similar that shows:

The ragdoll prefab being dragged into the scene view manually while in play mode.
The ragdoll prefab instantiated at the exact same position while in play mode.

...and post a link to it in your question?

If there is a difference indeed and nothing else is affecting the ragdoll to make it behave differently, it is a bug, and we would appreciate a bug report with a minimal project which reproduces the problem.

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Ian Spangler · Mar 19, 2010 at 05:01 PM 0

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I've just recorded video of a minimal test project as you asked: http://www.screencast.com/users/IanSpangler/folders/Jing/media/0a205d25-f0b2-4d93-abfb-1d9f7b3cbd43

I set all the properties for each of the 29 joints to 0 for testing purposes. As a side note, in the authortime scenario, the ragdoll seems a little too bouncy and bendable given that everything's set to 0. And it's even more snappy when I set the mass of the root joint to 29, so I've set it to 1 ins$$anonymous$$d. I have capsule colliders on some of the joints, but no particular physics material assigned.

Ian Spangler · Mar 19, 2010 at 05:10 PM 0

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I can also provide a download of the files for this project for you to look at if that would help. Thanks.

runevision ♦♦ · Mar 22, 2010 at 09:33 AM 0

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@Ian Spangler : Thanks for the video. We would appreciate a bug report with a minimal project which reproduces the problem. (Include a link to the video as well.)

Ian Spangler · Mar 22, 2010 at 02:45 PM 0

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I've submitted a bug report with the project attached. What would be the ETA for fixing this bug? If it will not be for a while, I will have to implement a workaround.

runevision ♦♦ · Mar 22, 2010 at 02:58 PM 0

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@Ian Spangler : What is the case number of the bug? In any case, I would recommend trying to find a workaround. The bug will likely get fixed in the next version of Unity at the earliest.

Answer 2

Answer by The-Arc-Games · Oct 29, 2011 at 07:38 AM

@"Ian Spangler" We would be very glad to take your model to test with our ragdoll generator tool if possible. Please get in touch with us through unity forums or our site

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Instantiated ragdoll behaves differently than when placed in scene manually

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