Le 21/12/2011 17:17, acasta nous fit lire :
> Hello everybody
> 
> I'm trying some test with HDR lighting, using the example shown in this thread:
>
http://news.povray.org/povray.general/thread/%3Cweb.4e316b7b630a1fa94c0a951f0%40news.povray.org%3E
> 
> I have commented the following sky_sphere block:
> 
> sky_sphere {
>   pigment {image_map {hdr "*HDR_FILE_PATH.hdr*" map_type 1 interpolate 2}}
>   rotate y*-120
> }
> 
> and added this instead:
> 
> sphere {
>   <0,0,0>, 10000
>   pigment {image_map {hdr "*HDR_FILE_PATH.hdr*" map_type 1 interpolate 2}}
>   rotate y*-120
>   hollow
> }
> 

> I expected to obtain the same result at this point, on the contrary I get a much
> darker image (so lighting must be substantially different) and also an array" of
> evenly spaced irregularly-shaped "blots" over the image.
> 
> Could someone please explain what is happening?


what is your finish on the sphere ? (hint: unless you use something
along "ambient 1.0 diffuse 0.0 ... ", the aspect of the texture/pigment
on a point of the sphere is subject to reachability by a light source,
and the relevant light that it gets.)

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