I was just trying out the PovRay tutorial and I rendered the very first 
scene before adding the light. To my amazement, the sphere is visible 
(although very dark yellow). If this is not a POVRAY error it seems to 
contradict my basic understanding of how raytracing works. How I can see 
ANYTHING if there is no light source in the scene???

  #include "colors.inc"    // The include files contain
   #include "stones.inc"    // pre-defined scene elements

   camera {
     location <0, 2, -3>
     look_at  <0, 1,  2>
   }

   sphere {
     <0, 1, 2>, 2
     texture {
       pigment { color Yellow }
     }
   }

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Frantisek Fuka wrote:

> I was just trying out the PovRay tutorial and I rendered the very first
> scene before adding the light. To my amazement, the sphere is visible
> (although very dark yellow). If this is not a POVRAY error it seems to
> contradict my basic understanding of how raytracing works. How I can see
> ANYTHING if there is no light source in the scene???

  :)  ...look for "ambient" and "ambient_light" at the syntax reference. 



-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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If I've known that before can I put the
"certified POV-Ray Class 1 User" on my signature ? :-))

--Theo

PS: Everyone has a certificate, from Microsoft, from Novel or checkpoint i
should order one from POV-Ray. :-) It simply makes good in the signature ...
----------------------------------------------------------------------------
Distributed Network-Rendering auf bis zu 600 PC's mit SMPOV und POV-Ray 3.5
Download ab sofort bei http://www.it-berater.org/smpov.htm

"Frantisek Fuka" <fuk### [at] fuxoftcz> schrieb im Newsbeitrag
news:3d70ca68@news.povray.org...
> I was just trying out the PovRay tutorial and I rendered the very first
> scene before adding the light. To my amazement, the sphere is visible
> (although very dark yellow). If this is not a POVRAY error it seems to
> contradict my basic understanding of how raytracing works. How I can see
> ANYTHING if there is no light source in the scene???
>
>   #include "colors.inc"    // The include files contain
>    #include "stones.inc"    // pre-defined scene elements
>
>    camera {
>      location <0, 2, -3>
>      look_at  <0, 1,  2>
>    }
>
>    sphere {
>      <0, 1, 2>, 2
>      texture {
>        pigment { color Yellow }
>      }
>    }
>

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Theo Gottwald * wrote:
> 
> If I've known that before can I put the
> "certified POV-Ray Class 1 User" on my signature ? :-))
> [...]

Bah, for that you need to achieve more than 35 points in:

Subject: The Harcore Povrayer Test
Date: 31 Jan 2002 11:58:22 -0500
From: Warp <war### [at] tagpovrayorg>
Newsgroups: povray.advanced-users
news://news.povray.org/3c5977ae%40news.povray.org

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 13 Aug. 2002 _____./\/^>_*_<^\/\.______

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