Skill Unlocked: Jiggle Physics! (Patreon)

I put myself to task to see if I could figure out dynamic breast motion using a physics engine.

Most rule34 3D you see out there uses additional bones for the breasts to mimic secondary motion. You can even see the ones still integrated in this old Solaria rig. Primary motion, for instance, is moving your head while the secondary motion is the hair moving afterwards. You can fake secondary jiggle by keyframing the breast bones left, then right, up, down, etc. This can become tedious and even odd looking if you haven't meticulously keyframed every position perfectly. By making the model a softbody, I painted the areas that will respond to gravity and perform true secondary motion within the simulation.

This exploration ultimately results in more realistic movement during our heroines' lewd and tawdry affairs.