Hi. I have been trying to do spine IK rig in the book “Body Language/Eric Allen&Kelly Murdock”. (The tutorial starts at page 58. )
I think I have followed the instruction the book says precisely but run into the problem. I’m at the point I added stretchiness to the spine joints by following the instruction in the book. (basically by connecting the necessary nodes in the Hypershade. )
Then when I set the second term option in the condition node to “1”, one of the joint in the spine joint chain disappeared. (there is 7 joints in the chain) I later found out that joint 3 and 4 have ben overlapped. When I switched the option back to “0”, then it goes back to normal spine joint chain. I have re-followed the instruction to find out what I did wrong but so far, no luck. I really want to find out why this has happened and what I did wrong. Any idea?
Thanks.

-naoki