expression for a baloon

[Eric Sanderson]

Not sure what kind of movement your looking for but it sounds like you could use a simple wiggle on the X and Z, and maybe a little in orientation, while moving it up in the Y to achieve that natural floating look. example of a wiggle would be,

wiggle(1,10)

1 = how many times a second it wiggles
10=the amount of the wiggle in pixels or degrees depending on your property.

[Incredible Bud]

Thanks I’ll try that.

And I’m using a dan herbert’s undulation expression (found on motionscript) for the rotation to give a more floating aspect.

Matthieu

[Eric Sanderson]

But actually the way i would go about it ( if you have particular ) is just make your balloon a single custom particle and you can control the gravity/wind physics/direction and turbulant field more realistically.