I think that the others here have just about covered the important points,
but I'm going to add my two cents a quarter and a nickel anyway.  It's
obvious to me that you didn't do your homework before posting this farce.

One of the first things you learn in English 101 - Or any english class
where writing is a major focus - is that you should always define your
abbreviations before you use them if they are not very commonly known.

For those of us here who don't know, but would like to, a BDRF is a
Bi-Directional Re-distribution function, and a quick search of the top hits
on Google will render more information.

That said:

I've been working with POV-Ray for about seven years now, but it's only
within the last four or so that I've begun to produce anything really
worthwhile, and, while I've never done it myself, I've seen others make
some remarkably realistic images with POV (HE Day's "Drunk Patrol" simply
blows my mind.)

In the future, it would be wise for you to research any topic you're going
to write about THOUROUGHLY, BEFORE you go making a horse's ass of yourself.

Regards,

ADB

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