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Am I not supposed to skin to the Cat's Ribcage bone?
show user profile  luzarius
I'm confused about the Cat Rig's RibCage bone. It works as a great controller, but am I supposed to skin my humanoid model to it or do I just skin to the spine3 and spine4 bones?

To clarify, do I leave the ribcage bone out of the skinning process?
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3/29/2016 4:41:56 AM (last edit: 3/29/2016 4:41:56 AM)
show user profile  herfst1
Skin the ribs. Skin them, dammit.
read 615 times
3/29/2016 9:59:59 AM (last edit: 3/29/2016 9:59:59 AM)
show user profile  Sir_Manfred
Skin all of them!

Visit my Portfolio

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3/29/2016 11:52:56 AM (last edit: 3/29/2016 11:52:56 AM)
show user profile  luzarius
lol really? What's confusing is the ribcage overlaps spine3 and spine4 so what's the point?
read 597 times
3/29/2016 1:01:15 PM (last edit: 3/29/2016 1:01:15 PM)
show user profile  Dave
I'm actually confused by that CAT rig too, I'm sure it has a use... somewhere, on something. But I've yet to discover it.

I'll always create my own CAT rigs though, so I've never had to deal with prefabs all that much.

"I flew over Egypt once"

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3/29/2016 1:28:31 PM (last edit: 3/29/2016 1:28:31 PM)
show user profile  luzarius
I think the ribcage bone is merely for use as a controller. What's shocking is I can't find any info on this. I can't even find any example where someone actually does the skinning for the rib cage.

I think I'm going to leave the ribcage out of the skinning and just skin to spine3 and spine4 and just use the ribcage as a controller.
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3/29/2016 1:59:26 PM (last edit: 3/29/2016 1:59:26 PM)
show user profile  herfst1

Skin ribcage.
read 586 times
3/29/2016 2:00:37 PM (last edit: 3/29/2016 2:00:37 PM)
show user profile  Nanne
I always skin the ribcage. Think about it this way; in reality the ribcage is a solid frame and the skin around it follows the ribcage. The purpose of the spine's many bones is to primarily to get the correct S-shape and the proper twisting motion. However the mesh around the stomach area is not directly effected by neither the ribcage or the pelvis so I skin these vertices to a combination of ribcage/spline bones and pelvis/spline bones, in order to balance out the twisting of the skin in that area.

Edit: I usually also add a Edit Poly Modifier to the ribcage bone and make a simple re-modeling of it to give it the rough shape and volume of a ribcage. I do this to have it as a visual reference when I animate the character without the skin modifier and character mesh visible. This can improve viewport performance and frame rate at playback (very important to get the timing right). It is also possible that the final character mesh is not ready yet, but the proportions are set and hence the rig can be created and animation can start before the final character mesh is completed.

Kristoffer Helander
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3/29/2016 5:21:56 PM (last edit: 3/29/2016 5:28:13 PM)
show user profile  Dave
Good info.

"I flew over Egypt once"

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3/29/2016 6:52:36 PM (last edit: 3/29/2016 6:52:36 PM)
show user profile  luzarius
Hi Nanne,

Thank you for your response. Here is my current setup:

Notice how the spine3 bone and ribcage occupy the same space. Therefore I don't see the point of skinning to the ribcage. The cat rig's ribcage automatically twists the spine bones.

In my case I would skin to Spine1, Spine2 and Spine3 then use the RibCage as a controller.

Is this not similar to what you explained?

Perhaps you have three bones total for the spine: Spine1, Spine2, RibCage

Another issue is I can't find a tutorial of anyone actually skinning both the ribcage and a spine that occupy the same space.
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3/30/2016 3:12:06 AM (last edit: 3/30/2016 3:13:35 AM)
show user profile  Nanne
I suppose if the two bones occupy the same space, that might make very little difference for the skinning. However, you might not always have only tree bones in the spine. For a more natural body motion, as the body twists and bend, you might have to have more spine parts, however the ribcage bone will always be there, so it makes for a more consistent workflow. And there is nothing that prevents you from using the ribcage both for skinning and as a controller.

Kristoffer Helander
  :: Works ::   |  :: Resumé ::   |  :: Contact ::   |  :: CG Blog ::   |  :: Links ::     
read 503 times
3/30/2016 9:06:05 AM (last edit: 3/30/2016 9:06:05 AM)
show user profile  herfst1
Dude........................................................................... skin ribs for fucks sake.
read 500 times
3/30/2016 10:01:17 AM (last edit: 3/30/2016 10:01:17 AM)
show user profile  Sir_Manfred
Skin the fycking ribcage!

Isn't it obvious that it has a pivot location different from spine3?
It is super useful for things!

Visit my Portfolio

read 498 times
3/30/2016 10:10:21 AM (last edit: 3/30/2016 10:10:21 AM)
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