Thank you for your reply.
What I want is all the intersection points hitted firstly by the ray, not
just those with the mesh object. The reason I found it in mesh.cpp is that
the object I designed is only made up by mesh object. Yes, Trace() function
is called to compute the color seen along the ray, but there is a variable
called Best_Intersection and I think this variable is the intersection point
I want.
I really appreciate for all of your replies, your replies are very very
helpful to me. Maybe sometimes I can not express my question very clearly
and make you feel a little boring. Sorry about that. I will try my best to
make my question more clearly. Thanks a lot.

Best Regards
Wu Yang
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3dcc1ea5@news.povray.org>, "Wu Yang" <wya### [at] cswrightedu>
> wrote:
>
> > I think there are maybe more than or less than one intersection point in
the
> > stack, and they are the intersection points with the same ray, and what
I
> > need is Best_Intersection->IPoint in Trace() function(render.cpp file).
Is
> > it right? Thanks.
>
> What you need is to buy and read a good C++ book or take a good course
> in C++, and then take the time to actually figure out what the POV-Ray
> source code does before trying to make any changes.
>
> If you then have a problem, state the entire problem and your goal
> clearly at the very start, not some useless "is it right" garbage that
> keeps everyone guessing as to what you are really doing. There really is
> a category of "stupid" questions, and most of yours fit in it...you
> could most likely easily figure out the answer yourself, if you knew the
> language the source code is written in.
>
> And finally, *READ THE REPLIES*. I don't know why some people just
> ignore it when people give them the answer, or worse, ignore the answer
> and go off on a wild goose chase...
>
> Now: where is Trace() defined? What does that code say it does? It says
> nothing about meshes, does it? The Trace() function is called to compute
> the color seen along a ray, adding this code there won't catch all
> intersection tests, but it will catch any kind of intersection, not just
> ones with meshes. I can't tell you how to do it, because you haven't
> said *what* you are trying to do, or what your goal is.
>
> --
> Christopher James Huff <cja### [at] earthlinknet>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tagpovrayorg
> http://tag.povray.org/

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