In article <3df2e6bf@news.povray.org> , "Wu Yang" <wya### [at] cswrightedu> 
wrote:

>    I tried to output all the intersection points to a file. What I do is
> defining a fstream object in Trace_Primary_Ray() function in vbuffer.cpp
> file. It is too slow. I tried to define a global fstream object, but it can
> not be compiled. Can I define a global fstream object? Thanks

Get a good "Introduction to C++" book in your campus bookstore.  The US$70
it will cost you will, after you read and understood it, cut your the time
you send on figuring something like this out to 1/10.  So it is surely worth
the money.

If you don't know how to do create global variables it will just be
impossible to explain it to you because it is impossible to assume you know
anything about what to do and one would have to write a book to explain it
in the first place.  So you buying the book it really the better alternative
for everybody.

    Thorsten

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