Welcome to my tutorial! Lets start off by identifying the bones you'll need.
The Breast bones should be children of the Chest bone. The Chest Target bones should be "free-floating" and not a child of any bone.
Compensate-Constrain "Translate To" each Chest Target bone to the Chest.
The Primary bones should have a lag setting of 4.
The Secondary bones should have a lag setting of 12.
Use two "Aim At" constraints on the breast bones, one pointing to its primary and secondary chest targets.
The Aim At constraint pointing at Primary bone should have an Enforcement Value of 70%
The Aim At constraint pointing at Secondary bone should have an Enforcement Value of 30%
The reason for 2 target bones is that if you only use one bone, the "bounce" looks a bit plain, but with the second bone when the breast bone bounces it will have a secondary, smaller bounce behind it which looks more natural.
Now for the last part apply a Spherical Limits constraint to each breast bone. This way if you move the body WAY too quickly the breasts wont fold in on themselves.
Spherical Limits Minimum XYZ Values: -35
Spherical Limits Maximum XYZ Values: +35
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That's the end of this part of the tutorial! Click here to see a 270k quicktime of this rig in action. |