Install :
- Fender Blender For Genesis 8 Female (Glutes Geograft)
- FG dForce Breast Presets for Genesis 8 Female
or
- HS dForce Breast for Genesis 2 Through Genesis 8 Female
Some of those bundles are geografts (because more polygons than the Base G8 enables more precise deformations).
But don't care about the graft, simply check Surface properties and dForce Weight Nodes. It'd be easy to understand how it's all done.
Save the Surface Properties of a bundle that works well (Save As > Simulation Settings Preset) and load them on any other Genesis.
- Load a G8F or Male
- Scene Tab > Options > New dForce Modifier Weight Node (to define which body parts move and which are frozen to simulation)
- Scene Tab > Options > Edit > Geometry > Add dForce Modifier : Dynamic Surface
Define a Weight Node in order to freeze some body parts and activate only the breast, ass, nose, ears, whatever.
And run the simulation, you'll end up with soft-body behavior on those body parts.
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I just did a test. Loaded a G8M. Added a dForce Dynamic. Didn't configure Surfaces at all, default values.
- On the left without any Weight Node defined. This means that the whole Genesis 8 is a soft body. 100% of his vertices will receive 100% of the dynamics effects defined in the Surface Tab for the object. (EDIT : Notice that jaw/teeth and eyes seem to have by default a weight at 0%, they are not deformed).
- On the right, I defined Weights manually.
Arms are 100%. Rest of the body at 0% (Node Weight Map Brush > Right Click in the viewport > Weight Editing > Fill Selected).
And between the arms' Surface and the rest of the body, It's a smooth of the weight (Node Weight Map Brush > Right Click in the viewport > Weight Editing > Smooth Selected).
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It's not VAM... but it's still very much feasible.
Good thing is : because arms, legs, nose, etc. are all different Surfaces. You can define different dForce Surface properties for each body part. To make some parts very flexible (ass), others less because of a cartilage (nose), or others even less because of a bone (arms).