Creating A Cog

[rumih]

Im trying to create a COG for my model. I have my curve created, but how do I "snap" it to the base of my spine?

[rumih]

Anyone? Center of Gravity? Anyone???

[naughty]

what does a curve have to do with CoG..? where does your spine come into it..?!?!

I think we need a bit more info.. the little you've given is just gibberish to me (and I'm guessing most other people hence the lack of replies). sorry.

[rumih]

QUOTE(Naughty @ 11/13/07, 09:34 AM) [snapback]276434[/snapback]
what does a curve have to do with CoG..? where does your spine come into it..?!?!

I think we need a bit more info.. the little you've given is just gibberish to me (and I'm guessing most other people hence the lack of replies). sorry.

You snap the curves to the joints so the curves act as controllers. This is seen in almost every rig ive played around with and have seen tutorials for. In this tutorial I have, it says to create a basic skeleton, create a curve that look like anything, then snap that curve to the base of the spine. after you snap it to the base of the spine, you freeze transformations and delete history. Then you name it COG. Then you proceed to put all other joint chains under the COG in the outliner as see fit.

Thats all I have...I was assuming since most people that help out newbies here are close to experts at maya, so the little info I gave I thought were normal terms for base knowledge on this subject.

[joojaa]

Umm that has nothing to do with CoG. But your rig can have a cog indivcator but thets something different.

Theres several ways to do this (a infinite in fact), a bit depending on what you wiant to drive

[rumih]

QUOTE(Joojaa @ 11/14/07, 04:29 PM) [snapback]276500[/snapback]
Umm that has nothing to do with CoG. But your rig can have a cog indivcator but thets something different.

Theres several ways to do this (a infinite in fact), a bit depending on what you wiant to drive

That doesnt make sense then. This comes right from a tutorial my teacher handed out at class last week. I would ask my teacher but shes away for the next week. The title of the tutorial page is "CENTER OF GRAVITY (COG)" and it says to do just what I listed above. How does it have "nothing" to do with CoG? Im so confused now...

[rumih]

Ok, well even if what im saying is completely wrong, can anyone just answer my initial question? How would I "snap" the curve to the spine? What would that be implying? Thanks guys

[joojaa]

QUOTE
Im so confused now...

No kidding That would be teachers for you. (are you sure your teacher didnt mess up Ctrl and CoG ) Wich would also obviously explain the need to ask,

just parent the damn thing.

But CoG is actually where the weight for your object is, its different it is affected by the joints but its the sum of all the weighted vectors of each joint itself. Offcourse the controll might represent the cog of that sub joint by being placed exactly around the center of the joints gravity. Tough usually it isnt but rather its placed closer to the actuall joint socket. But it certainly isnt usually called CoG very offten, not where i come from.

For example take this rig:

http://www.highend3d.com/maya/downloads/ch...e-Rig-4964.html

Wich represents a typical (but simple and only half finished, mainly because the author didnt bother t set the defult manips for the controll nodes and theres wierd uneveness to the rig) rig, does not have GoG placements, but rather just plain Controll ones. And it does not have a CoG indicator.

However i have seen the root control once before refeered CoG but thats just plain misleading. Unless its aciually linked to be and stay on the center of gravity. (wich is possible to do)