Physics

Use the Physics tab at the bottom. A model without physics data shows "This model has no physics data".

• Physics switch: simulation on/off
• Reset physics: return the sway to its initial state
• Damping sliders: one per part the model has (Chest, Hair, Skirt, Hips, Thighs, Ears, Tail, Sleeves, Cape, Ribbon, Wings, Other). Lower sways longer; near 1 barely moves.
• ↺ beside a slider: back to the PMX value for that part.

Reopening the model restores damping to the PMX values.

Grabbing the model to make it sway

Press T for model mode and drag an MMD model: it turns, and physics bones such as hair and skirt sway with the movement. An XXMI outfit with wearing turned on follows too. Shift+drag moves the model. It stays where you leave it; Reset model puts it back.