[ODE] Newbie questions.

[Megan Fox]

1.) The initial position will be at 0,0,0

2.) I've never tried it, but I suppose removing a geom from a space
that doesn't contain it could cause a crash.  As always, check all
your data, and duplicate the problem in some small repeatable way that
can be easily explained.

3.) Yes, it will increase the fall velocity over time, but with a
force that small (if you're using larger scales), it will likely not
be particularly visible.  Try increasing the gravity, you'll see the
acceleration easily.

4.) dBodyGetLinearVel() (or dBodyGetAngularVel - I don't know which you wanted)

5.) Yes.  The callback is where you customize ODE's functioning to
your app... it's where you implement whatever friction systems you
have in mind, detect and react to collisions, etc.

-Megan Fox

On Mon, 28 Mar 2005 13:57:32 +0200, longshot <ode at gunfight.net> wrote:
> 1)
> dGeomID dCreateBox (dSpaceID space, dReal lx, dReal ly, dReal lz);
> What is the initial position of the box?
> a) (lx/2,ly/2,lz/2)
> b) (0,0,0)
> 
> 2)
> This function crashes my app:
> dSpaceRemove (spaceid, gid);
> According to the manual the function should work always.
> I am sure spaceid and gid are valid, but not sure if gid is in spaceid.
> 
> 3)
> dWorldSetGravity (worldid, 0, 0, -1);
> gravity makes my object drop but my object does not increase its drop-speed
> over time?
> 
> 4)
> Is there a way to read the velocity of an object?
> 
> 5)
> Is a callback function always needed on collision?
> 
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