I was just wondering, if I made like a cube of air, passible, and invisible, and it hit like models, how would the physic's engine take it? I would it be possible to simulate wind this way?

The very notion of "Passable" is incompatable with Physics and thus any Physics Engine.
To my knowledge, the Passable entity should just go thru any entity.


To simulate wind quite effectively, you need nothing more than phent_addforceglobal.

Thanks Fastlane

Okay, would it be the same with water?

Just thought of an way to approximate wind that could work much better than addforceglobal. Heres what you should do:
1. Iterate troough all vertices of the model every frame
2. Apply a force in the opposite direction of the normal of the vertex(only if the normal faces the wind)at the vertices position.
Or alternate #2 (Don't know which )
2. Apply a force in the opposite direction of the bounce vector of the normal of the vertex and the winds direction(only if the normal faces the wind) at the vertices position

I think #2 should work...

That sounds very complex but i think it might work pretty well(No scientific proof whatsoever, just improvising...)

This would theoretically spin the modell with the wind, not just move it, but since it doesn't take into account the sizes of the faces(every vertex has an equally sized effect) it's very crude and i don't even know if it is mathematically correct or works at all, just throwing an idea...

~Phantom88~

1) ou still need phent_addforcegolbal (or addforcelocal) to apply the force at the vertices.

1) Just using even one Phen_addforceglobal call off-center will spin the model.

2) The phent_addforce commands add a force at a point, not to a face.


Not quite sure what we are gaining or doing diffrently in your examples.

Couldn't you just use
var wind[3] = 20, 0, -386; // play with the numbers, x is the wind strength
ph_setgravity(wind);

To simulate the wind?

I ported a wind system to c-script a few months ago. Check it out at the link. There's an example on how to use it with the physics engine:

http://www.conitecserver.com/ubbthreads/showflat.php?Cat=&Board=UBB3&Number=300853

It's much more complex than the simple(but still effective) way that Verorien offered. If all you need is a constant breeze in a given direction, then his way is all you need. Mine gives you a completely random system with gusts, stillness, direction change, and a direction indicator. It can also be setup for non-random behavior, though.

It's not nessarily the best way and it may or may not be all the efficient, but it's there for you to tinker with if you want.

Absolutly Velo.

thanks,

is water hard because of the wind? How would you start that?