POV-Ray : Newsgroups : povray.general : 24 bit heightfields : Re: 24 bit heightfields Server Time
30 Jul 2024 20:25:45 EDT (-0400)
  Re: 24 bit heightfields  
From: SharkD
Date: 11 Dec 2008 17:55:00
Message: <web.49419947869f689fe63ea9550@news.povray.org>
Nicolas Alvarez <nic### [at] gmailcom> wrote:
> SharkD wrote:
> > "clipka" <nomail@nomail> wrote:
> >> it's not very easy to tell, given the low resolution - but it is quite
> >> obvious that the red channel is most significant. So I'd guess that the
> >> height is coded as:
> >>
> >>     height = red + (green/256.0) + (blue/65536.0)
> >>
> >> with red, green, blue and height all ranging from 0.0 to 1.0.
> >
> > I don't quite understand your math. If red, green and blue all range from
> > 0 to 1, then the maximum possible height is 3. The maximum height of
> > heightfields is 1.
>
> Those maths assume red, green and blue go from 0 to 255, and height would be
> from 0 to 16777216.

OK, but 255 + 255/256 + 255/65536 still don't add up to 16777216!

-Mike


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