After three to four weeks I done with torso, neck and arm part.

It was very tough for me writing, hence this one is my first attempt of such a big script.
but, later on was just fantastic becoming more interesting and interesting.

First time when I was designing my top down design (Its like a blue print for house, rough sketch of how interface gonna create and its functionality), I kept it simple structured. No extra things included . But, after a while I found my script is not so simple structured that I earlier decided.

Rig features :

Torso : User can on/off stretch and volume preserve and he can also adjust value of squash (is volume preserve is ON) by selecting proper node and now, he need to just manipulate graph in graph editor (as shown in video).

Neck : User can on/off stretch for neck too. Head could be totally independent as well as follow along neck, shoulder, hips and COG with positions and rotations controlling independently .

Arms : Hmm.. I like this part, lots of things stuffed inside ..

1) If user needs segmented arms, which also handles real arm twisting from upper arm to wrist, means arms doesn't break at all even elbow rotated any directions. And of course it is very use full for deformations.

2) Stretchy Arms, as usual arm will get stretch far away having model on

3) Elbow Lock, this will lock down elbow at pole vector's position and user will still have access of stretching the arm from both side ie. from upper arm and from hand.

4) Auto Clavicle, this will automate the clavicle movement considering elbow position. User can adjust blend from 0% to 100%, for how much it need to follow with the arm. So, now user don't require to animate the clavicle. Because most of the time animators ignore the clavicle.

5) Seamless FKIK Snapping, it snaps FK arm to IK and IK arm to FK. Very handy.

Script is smart, no need to mention specifically which one is left or right side. It'll calculate itself and gives proper prefixes, colors and orientations of controllers.
By double clicking in arms input field window will appear for replacing for rest side of arm. If field is having left side then it will get replace with right side of the arm

This is the status of my auto rig script .
It needs 1-2 working weeks to complete coding.

I am also writing pose Manager, which will allow user flexibility to load pose, save pose, character to character transfer pose, bookmarks etc etc.. And also added new features for preferences of user interface. User can adjust layout so if he want to see only poses he will see only those parts and so on...

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Cheers !