Thank you for your reply.
I want to compute the distance between the camera and the intersection
points made by camera rays and objects.

Best Regard
Wu Yang
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3dcc6dd1$1@news.povray.org>,
>  "Wu Yang" <wya### [at] cswrightedu> wrote:
>
> > What I want is all the intersection points hitted firstly by the ray,
not
> > just those with the mesh object.
>
> By which rays? Every single intersection test ever made by the tracer
> while rendering, or just the ones from the camera?
>
>
> > 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.
>
> It is the nearest intersection Trace() finds. However, because Trace()
> is used to compute the color, there will be intersection tests that do
> not reach your code, because they don't call Trace(). I think Trace() is
> only used for the primary camera rays, reflected rays, and refracted
> rays, not for the trace() language function, shadow rays, or anything
> else that needs to trace a ray but doesn't need to compute the color
> seen along it. I don't know what you want to do with the data, so I
> can't make any better suggestions. If you would just tell us what you
> are doing, you would get much better help.
>
>
> > 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.
>
> Boring isn't the right term, "frustrating" is better. Trying to figure
> out what you want from vaguely worded questions and trying to understand
> why you are modifying these odd places in the code, especially when you
> ignore repeated questions about what you are trying to do.
>
> --
> 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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