[ODE] New stuff

[Martin C. Martin]

Because the ray isn't an ODE geom (unless I missed something), it isn't
part of the regular collision and dynamics system in ODE.  It could be
used, e.g. in a shooting game to see what a bullet hits, or when someone
click on a screen to find out which object is clicked on.  Sometimes you
want to find out the 3D location of where the hit happens.  You can
compute that from this "penetration depth."

Perhaps calling it penetration depth is confusing?  Maybe it should be
renamed?

Just a thought,
Martin

Thomas Harte wrote:
> 
> > The dRay class now returns reflection normals, and penetation depths. The
> > penetration depth of a line is the distance between the contactpoint and the
> > endpoint of the line.
> 
> I'm sorry, I have not tried your code, but is this not incorrect? My reading of the various
> documentation was that penetration depth was distance along the normal vector, so that
> ODE can discreetly apply a penalty method. i.e. the amount you'd want would be
> 
> (endpoint - contactpoint).(plane normal)
> 
> not, what you seem to be saying :
> 
> | endpoint - contactpoint |
> 
> I bring this up mostly because I am new to ODE and am wondering - have I
> misunderstood what the penetration depth information is for?
> 
> -Thomas
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