POV-Ray : Newsgroups : povray.binaries.images : Re: A box *with* a light (and spheres) Server Time
5 Oct 2024 05:15:18 EDT (-0400)
  Re: A box *with* a light (and spheres) (Message 1 to 1 of 1)  
From: Bob Hughes
Subject: Re: A box *with* a light (and spheres)
Date: 26 Jan 1999 04:58:55
Message: <36AD91D3.6A588D1F@aol.com>
Think you might be seeing the granite-normaled (closed) box interior
instead. Fact is the plain, un-normaled texture was at least a little
blotchy no matter what I tried it seems (remember, I was going for speed
too), so I gave the box a rough surface to mask that. The spheres are on
the bright side, but less ambience made them look dull. I used
brilliance and metallic to go with the reflection. Intent being they
would appear to shine their colors for a reason, unlike dull,
reflectionless, metallicless objects.
Well, heck, it's a radiosity tester for me, that's all, anyhow :)

Mike wrote:
> 
> Looks good.  The focal blur gives it a film grain look, which seems to
> improve the overall look of the radiosity.  It makes it look like
> there's blurred reflections coming off the wall.  Only problem I see is
> that the colored spheres look a little too bright, like they are
> glowing.
> 
> -Mike
> 
> Bob Hughes wrote:
> >
> > In the spirit of Nathans "A box with no lights" image.
> >
> > A dim light ( about rgb 0.4 ) inside a White box with a granite normal.
> > 3 grayscale spheres (white, gray, black) and 3 colored spheres (red,
> > green, blue) scattered about the bottom. Focal blur used instead of
> > anti-aliasing.
> > I was searching for a good, quick, radiosity setting; testing with this
> > 320x240 image. Similar to Nathan, I went down from a typical amount of
> > the 'distance_maximum' value instead of up. Nathan used 0, I used 1/3
> > sphere radius instead [1/3 camera to object-average-distance was about
> > 2.125].
> > Likewise downward for 'gray_threshold' 0.3 (more color) and
> > 'error_bound' 0.3.
> > 'low_error_factor' 0.6 (which is multiplied by error_bound for pre-final
> > pass), minimum_reuse was left default of 0.015 (pixel/screen based
> > ratio). nearest_count 7, up one from Nathans. And recursion_level 1, the
> > default, down from Nathans 3 (2 or more slowed drastically). 'count'
> > 150.
> > 'ambient_light' 4.5 was also used in 'global_settings' with default
> > ambient and diffuse in the textures.
> > The colors may appear pretty vivid on the box walls, but I figured if
> > the spheres are reflecting there should be a fair amount showing. Note
> > that, as stated before by someone, the black sphere creates a dark area.
> > I would think this might be a reasonable analogy to real light effects.
> > Not sure.
> > I tried to check this in reality and at least a dark object appears to
> > prevent the other surrounding ambience from being dominant.
> >
> > This picture rendered in almost exactly 30 minutes, (focal blur
> > [aperture 0.5, blur_samples 200], radiosity, reflection [0.3]), on a
> > 233MMX Intel, 64MB 66MHz SDRAM.
> >
> > --
> >  omniVERSE: beyond the universe
> >   http://members.aol.com/inversez/POVring.htm
> > =Bob
> >
> >   ------------------------------------------------------------------------
> >  [Image]

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.htm
=Bob


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.