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On 09/15/2010 04:42 PM, CapitalSpace wrote:
> Jim Holsenback <jho### [at] povray org> wrote:
>> check out:
>> http://wiki.povray.org/content/Documentation:Reference_Section_3.1#Fog
>>
>> particular attention to "up" and transformations ...
>
> yes, thanks it appears i have the test pov working with this.
>
> however, my own scene has the camera with "up 39.00*y" - any caveats about
> mixing the up vectors? the scene seems ok.
hmmm ... Don't believe I've ever used anything other than the default
"up" in a camera definition. Perhaps with such a large up vector you
might be having a granularity issue ... that is a little bit of
transformation (rotation) produces too big a change (degrees). If your
setup is something vaguely like: camera in -z looking toward +z then fog
transformation in the x (rotate) might do the trick ... rotate so that
the ground fog is below the ground plane in the foreground.
>
> oh, and should fog play nicely with radiosity?
>
Should ... if you have any media in containers sometimes the containers
become slightly visible if the fog intercepts
> i originally wanted the fog to start from a certain point, so the foreground is
> always unaffected by fog : but it seems "that's not how it works".
>
Give the default camera "up" a try and experiment
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