Help Aerodynamics for non cloth

[josemendez]

Ok!

From when I'm testing if I move the attachement transform of a rope (that is child of solver), it will not induce aerodynamic forces as I would expect - but only when I add wind.

Aerodynamic forces take effect even in the absence of wind (wind set to zero). However make sure you're not confusing wind with inertia (what would happen when the character starts/stops running and the ears flop accordingly).

From the documentation it seems like aerodynamics for cloth moving particles on by default? Maybe I'm misunderstanding something. 

Aerodynamics are on by default for all actors.

The use case is large ears almost as big as head. So we would like the wind to bend them backwards when running etc.

In the real world that would happen mostly due to inertial forces, not wind: set the solver's world space linear inertia scale to something else than zero.

If you're completely still and then start running, your ears would want to stay still so they'd flop backwards. Similarly, when you stop running your ears would want to keep moving so they'd flop forwards. While running at a constant speed (no acceleration), the ears would be completely still.
Ears (no matter how big and floppy) are usually not light enough to experience any significant drag forces just from their owner walking around, assuming regular - not extremely dense - air.

The documentation says that one should put solver on the character transform. Is the intended way to provide wind forces from character movement to apply wind forces manually?

I still get the feeling that what you call "wind" is just inertia. Inertia is controlled via the solver's inertia scale sliders, which allow you to independently control linear and angular inertia.

And do I undestand you correctly that you have seperated the forces so that regular movement of particles does not induce aerodynamic forces? So does that mean aerodynamic constraints are only active when we use wind forces?

They're not separated, moving particles are also affected by aerodynamic forces even in the absence of wind. The thing that matters is the relative velocity between the particles and the wind.

Important to note here: solvers perform simulation in *local space*, so moving the solver around rigidly transforms all particles inside - not affecting their velocity and hence, not giving rise to any aerodynamic effects.

kind regards,