"makc" <mak### [at] gmailspamcom> wrote:
> "Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
> > "makc" <mak### [at] gmailspamcom> wrote:
> > I can't remember having seen a function where this way of doing it is
> > not possible.
> >
> > But if you or anyone else can come up with a good challenge, then
> > please post it.
>
> Not exactly my original problem, but nevertheless major waste of cpu: the
> absence of "if"-like function (or am I overlooking it?)
>
> Simple condition (x > 0) ? func (x) : 0 can be modelled, for example, with
> something like func (x) * ceil ((1 + abs(x) - abs (x - 1)) / 2), but this means
> pov will calculate func (x) for every x < 0 where it is not needed.
>
> I am actually trying to render 3D fractals with isosurface, and it works, but is
> painfully slow, and I don't see anything I can do about it without recompiling
> povray with added internal functions :(

You might want to have a look at this post:

http://news.povray.org/povray.binaries.scene-files/message/%3Cweb.4b43d232b2edd653527a960f0%40news.povray.org%3E

http://tinyurl.com/yfsl9nt

Group: povray.binaries.scene-files
Subject: "Re: Happy 2,0,1,0 Quaternion-power 'Bulb!"
From: Tor Olav Kristensen
Date: 6th January 2010

--
Tor Olav
http://subcube.com

Post a reply to this message