My Journey into Animation

Mechanical Cat Spine test

by on Feb.04, 2014, under Uncategorized

So this is one thing I have been working on lately. It is part of my rebuild of the mechanical cat rig that I started last month. I rebuilt the legs already so they can move out but this spine was my next challenge. Originally I used a IK Spline but the spine wouldn’t straighten out then so I switched to a regular IK. The problem then was to get each piece rotating as it should without swaying or disconnecting. That basically means I had to use a whole assortment of corrections to counter rotations and keep everything in check. That includes 3 sets of joints with one for the main IK, a second with each segment IK’ed to control the angle of the third which allowed each piece to rotate along the Z axis and keep the X and Y oriented in the correct direction like an actual U joint would. There is a Pole Vector control to allow the angle to be shifted but that also required a correction Pole Vector control which you can see at the bottom to keep the end in line.

Next up is to insert it into the main rig and check over everything. I might look at redoing the tail but I really like the system that I created for it on my first version.

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