[Plib-users] Vector intersection testing

[Karl M. H. <Kar...@gm...>]

Hello,

I'm new to this list, sorry if I repeat anything. I was searching
the sourceforge archive on this topic, and found one thread, but
the matter wasn't resolved in there.

I'm using the mouse routine to start some pathfinding algorithm,
and need to find out, which point on the ssgRoot the mouse points
to. 
To do this, I would need to intersect a vector (direction of campos,
starting at mouse coordinates) with the scene.
I tried using ssgLOS, but looking in the sourcecode of plib, it seems
that ssgLOS is only intersecting a vector (0,0,0) + x (s), and I don't
see how to intersect a vector not starting at (0,0,0).

Are there any solutions for this problem in plib (I'm using the CVS version),
or do I need to write a function for that from scratch?
I think such a vector intersection function would be quite useful for many
applications (Basically for all applications using the mouse for more than
clicking on buttons or stirring some vehicle). I'd be happy to implement
such a function into ssg if there isn't already some functionality covering 
that problem.

A happy new year,

Karl Moritz