**comp.graphics.algorithms**

## Subject: **Re: Basic perspective/normal q**

"Hans-Bernhard Broeker"

news:4bm6oaF12934mU3@news.dfncis.de...

> [Jongware]

>

>> Well, my C compiler doesn't accept

>> > (P-P0).N = 0

>

> Of course it doesn't --- that's not C, it's vector algebra. The '.'

> in particular is a scalar product operator. I had assumed that much

> to be obvious to somebody who just implemented matrix-vector

> multiplication.

That is, now I start to appreciate them. Ah well, it has been 20-some years

since I did my exams in math, which *did* feature 3D -- with pen and

paper --, scalar products and all. It's just one of those things you have to

keep up, or pay the price later (i.e., now).

Now you got me worrying about ever needing again the statistics,

electronics, mechanics, nuclear physics, astronomy, and etymology I remember

knowing once.

[jw]

---

"Every time I learn something new it pushes some old stuff out."

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