[ODE] Subtractive Geometry

[Brian Bell]

It seems to me that this is definitely doable with a custom geom class, that
aggregates the existing geom classes.  The additive geoms could be
represented internally as a standard composite geom.  The collision logic
for the geom would be something like ( colliding with additive-composite &&
!colliding with subtractive ).

The only problem I see is supporting surface collisions along the
subtractions.  It seems that this could be handled properly if all the geom
classes handle interior surface collisions properly, which I'm almost
positive they don't.  But that seems like something that could be added...

Brian


----- Original Message ----- 
From: "Adam D. Moss" <adam at gimp.org>
To: "ode" <ODE at q12.org>
Sent: Monday, March 29, 2004 4:50 PM
Subject: Re: [ODE] Subtractive Geometry


> Dave Ratti wrote:
> > I'm still learning ODE, but have a quick question: I'd like to use
> > dCreateBox to create a box, and then some how put a hole through it: ie
> > put a cylinder through it and have the union of the two bodies be empty
> > space. Like the test_boxstack example, but instead of adding each
> > geometry, I'd like to subtract. Is this possible?
>
> No, not currently.  There may be some wonderful hacks to
> this effect, but actually I don't think so.
>
> --Adam
> -- 
> Adam D. Moss   . ,,^^   adam at gimp.org   http://www.foxbox.org/   co:3
> _______________________________________________
> ODE mailing list
> ODE at q12.org
> http://q12.org/mailman/listinfo/ode