IK rig distortions

[flyingP]

might be handy to post the rig Adam, you won't need to include the mesh methinks

[kromekat]

Ok - here (http://www.kromekat.com/examples/ScoutRig.c4d.zip) is the rig and the basic bodysuit attached.

This is what the complete item looks like.
http://www.kromekat.com/atom/scoutIK.jpg

http://www.kromekat.com/atom/scoutIK2.jpg

[Erith]

:)Nice model!

Are u using the model tool or the object tool to animating?

[kromekat]

Thanks! ;)

Ah! - er - the Model tool! :] - is that the problem? - doesn't normally make any difference to the other things I have animated - this is my first ever IK rig though!?

Adam

EDIT: Just read in the manual about the Model/Object tools - I am scaling the model down to size with the model tool at the beginning, but it's not being scaled thereafter - however, I am using the model tool to select and move & rotate the nulls, cameras etc when I keyframme them, rather than the Object tool - should I use the latter always for anything I animate?

[Erith]

I had the same problem with mocca... If I scale a character with the model tool, then The rig starts to deform... Then I've usd the object tool (I rescaled char with the obj tool) and everything was ok!


Sorry for my bad english

[kromekat]

Ah - many thanks! - I suspect that maybe it then - I'll try again with that tool instead! :]

Nothing wrong with your English btw - and since my Italian sucks... :)

Adam

[Cactus Dan]

Howdy,

Well, I'm not sure if this is what you're experiencing, but there seems to be a "drift" in the bones during animation. That's why I added the options to my IK tags "Keep Bones Connected" and "Keep Next Connected". These options help to keep the bones from drifting during animation. If you have a Null bone parent on a bone chain, you'll need to add an XPresso constraint, or if you have CD Constraints or mdme_sadie's Constrainer, use a position constraint on the next bone down from the Null parent to keep that bone from drifting away from it's parent.

I've experienced this drift after playing an animation through, letting it loop several times. After a while the rig would become all distorted because of the bone's drifting. So I added those "connected" options to the tags. ;)

Adios,
Cactus Dan

[kromekat]

Thanks for that Dan

But - to clarify - should I enable the 'Keep bones connected' and 'Keep next connected' on every IK tag, OR just add the CD constraints to the next bone, since I am using Nulls for the arm, leg and hand bone chains!?

Adam <-- New to this rigging m'larky! ;]

[Cactus Dan]

Howdy
Thanks for that Dan

But - to clarify - should I enable the 'Keep bones connected' and 'Keep next connected' on every IK tag, OR just add the CD constraints to the next bone, since I am using Nulls for the arm, leg and hand bone chains!?

Adam <-- New to this rigging m'larky! ;]
Well, normally I only use them when needed. The drifting is a bit unpredictable, so rather than hard coding the connection into the tags, I made it an option so you can use it when you need it. ;)

Adios,
Cactus Dan

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