How to maintain joint form when doing IK Dynamics?
Posted: 26 November 2019 06:16 PM   [ Ignore ]  
Total Posts:  199
Joined  2017-09-24

Hi

How do I maintain the joint chain’s form when adding joint dynamics?
I can’t set the rot hold to 100 since it will negate all the dynamics effect.

You can see an illustration of the problem here:
https://www.dropbox.com/s/26vs13upquj6d92/c4d181_joint_chain_form_dynamics.jpg?dl=0

You can check the illustration file here:
https://www.dropbox.com/s/s08o9w8q47olt81/c4d181_joint_chain_form_dynamics.c4d?dl=0

Thank you for looking at my problem.

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Posted: 26 November 2019 06:45 PM   [ Ignore ]   [ # 1 ]  
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Hi Ben,

Thanks a lot fo the file, very much appreciated.

Please try the following:

When you set up the IK, go to Dynamics> Forces> Gravity.
Set the Gravity to zero. Otherwise, this is the first ‘thing’ that will pull on your joints.

Let me know if that works for you, thanks.

All the best

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

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Posted: 26 November 2019 09:06 PM   [ Ignore ]   [ # 2 ]  
Total Posts:  199
Joined  2017-09-24

Hi Dr. Sassi,

I initially though that without Gravity the dynamics would not work. Guess I was wrong. It still works.
Thanks!

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Posted: 26 November 2019 09:13 PM   [ Ignore ]   [ # 3 ]  
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You’re very welcome, Ben.

I’m glad it works for you.

Please note that in the Main Menu> Simulate> Forces> Gravity: Field, you have an option to create a more specific Gravity, in case you need it.
It needs to be in the IK> Dynamics> Forces> Forces: [Entry]

With the option to limit the Gravity with Field[s], you can keep the initial set up and move later this force back into the game, if needed.

My best wishes

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

Photography For C4D Artists: 200 Free Tutorials. Texture, Panorama, HDRI, Camera Projection, etc.
https://www.youtube.com/user/DrSassiLA/playlists

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