Thank you for your reply.
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.

Best Regard
Wu Yang
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3dcbdcab@news.povray.org>, "Wu Yang" <wya### [at] cswrightedu>
> wrote:
>
> > Is Depth_Stack->istack->IPoint the (x,y,z) value of a intersection
point?
>
> It is one of them, if there are any on the stack. (What else would it
> be?)
>
> --
> 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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