Re: [Plib-users] Vector intersection testing

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

It's me again.

I think I sent this to the wrong list first, moving it to plib-devel now.

Since nobody answered to my problem, if had to solve it myself :-)
I solve my problem using gluUnproject and ssgLOS with some 
matrix transformations first. The result is a function
getScreenIsect (int x, int y) ;
which returns a list of ssgLOS hit results. 
I'm not a very professional programmer, so the code is probably
ugly and slow, but if anyone wants it, just contact me.
I still think this should be a plib core feature, and would be happy
to commit my function to plib (someone should have a look at it
first, though).

Karl Moritz

On Wednesday 31 December 2003 11:29 am, Karl Moritz Hermann wrote:
> 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
>
>
>
>
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