[ODE] Adding Negative Masses

[LR]

I've just tested and ... The geom with negative mass (encapsulated in a
transformgeom) is falling and not collide with my plane ...

Laurent.

-----Message d'origine-----
De : ode-bounces at q12.org [mailto:ode-bounces at q12.org] De la part de Bram
Stolk
Envoyé : mercredi 26 avril 2006 10:01
À : Wesley Smith
Cc : ODE Mailing List (E-mail)
Objet : Re: [ODE] Adding Negative Masses

Wesley Smith wrote:
> Hi,
> I'm curious is if it's possible to use dMassAdd() to add a negative 
> mass to a large mass and have the result be as if a chunk of that mass 
> went missing of the corresponding form.  For  example, if I do 
> dMassAdd(), combining 3 objects, and now want to take one of them 
> away.  Assuming that I've kept some record of the original small 
> body's mass, can I negate it's mass params in the dMass struct and 
> then call dMassAdd(&compositeMass, &body2) and have it behave as if 
> body 2 had been taken away?  I'm guessing yes, but I want to be sure.
> 

Hey... nice idea.
I can't say for sure, but my guess is that it works.
You'll just have to try.

It would be nice to have an example that simulates a helium balloon in ODE.
Or a hindenburg? Cool! I just may try that in my spare time :-)

 Bram
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