POV-Ray : Newsgroups : povray.binaries.misc : transformation matrix : Re: transformation matrix Server Time
18 Jun 2021 01:12:06 EDT (-0400)
  Re: transformation matrix  
From: jr
Date: 26 Dec 2018 08:55:00
Message: <web.5c238746a8b241df48892b50@news.povray.org>
hi,

clipka <ano### [at] anonymousorg> wrote:
> Am 25.12.2018 um 18:18 schrieb jr:
> > that in mind, can someone please explain why the manual (3.3.1.12.4) mentions a
> > "..fourth column implicitly set to <0,0,0,1>..", but the subsequent equations do
> > not include/use those values.
>
> ...
> The resulting data structure can be considered a 4x3 matrix, with the
> last row[*] having special semantics: While the other rows are
> multiplied with the respective coefficient of the original vector, this
> last row is added "as is", without any multiplication.
> ...

thank you v much for the detailed explanation.  so the 4th column is the
optional extra that allows the translation wrt "surrounding" space?

I will need to abstract your reply (and Bald Eagle's reminders), write it out in
my own words  in the hope it'll sink in.


regards, jr.


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