Guide

Physics

The rig is a set of pendulum chains. Some parameters push them (head angle, body angle) and the swing writes other parameters (hair, accessories).

• Physics is on after load when the model has a rig. ay2d_set_physics(m, 0) holds it, so you can drive those parameters by hand.
• ay2d_set_wind(m, x, y) adds a steady push, in the units gravity has (gravity is 0, −1).
• ay2d_reset_physics settles everything at once, for a scene cut or a teleport.
• A long frame is stepped as one long step. If your frames can stall, clamp dt (to 1/15 s, say) before passing it.