In article <402### [at] hotmailcom>,
 andrel <a_l### [at] hotmailcom> wrote:

> > If that's wrong, than the original equation is too. 
> Sorry, I did not check all your equations, I should have.
> You are absolutely right here, your original equation
> is wrong. There should not be a minus there either ;)

Well, that would explain why my equation works for finding tangents to 
it, but yours doesn't. Thought it looked odd...


> off-topic: Mostly I do the math required for POV by hand.

Mostly I program the computer to do it for me. I'm terrible at that kind 
of thing, always making arithmetic errors and simple little stuff like 
that...at least it wasn't me this time.


> For years I did not do as much math as I do now. Sometimes
> I even try to convince people that POV is an interesting
> kind of application for learning math at a highschool level.
> You often want to achieve some goal and the only way to do
> it is sit down and do the equations. Along the same line,
> if someone asked me why that should learn math at highschool
> one of my answers is: to be able to create realworld
> objects in POV!

It is a very good way of learning how the math applies to and relates to 
the real world, or at least approximations of it.

-- 
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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