POV-Ray: Newsgroups: povray.binaries.images: Why do ISO surfaces slow down radiosity so much? - 1 attachment: Re: Why do ISO surfaces slow down radiosity so much? - 1 attachment

POV-Ray : Newsgroups : povray.binaries.images : Why do ISO surfaces slow down radiosity so much? - 1 attachment : Re: Why do ISO surfaces slow down radiosity so much? - 1 attachment - 1 attachment		Server Time 16 Aug 2024 06:10:46 EDT (-0400)

From: Christoph Hormann
Date: 12 Apr 2002 04:22:21
Message: <3CB69939.DA52425D@gmx.de>

Rich wrote:
> 
> [...]
> 
> #declare Rough = function { pigment { wrinkles scale 0.75 } }
> #declare Rock = function { x*x + y*y + z*z - 1 }
> 

For 'Rock' you should use the internal 'f_sphere' function from
functions.inc because it's faster and has a constant gradient (like when
using 'sqrt(x*x + y*y + z*z) -1')

Christoph

-- 
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