On Tue, 20 Aug 2002 20:23:03 -0400, Patrick Dugan quoth:

> I know that if anything changes within a scene you need to save (rather
> than load) a new photon map file.  Does the same thing hold true if you
> alter the render size?  For example I render an image at 320x200 and
> save the photon map.  Would I use the same map if I rendered the same
> scene at 1280x1024 or will it need to be "reshot"?
 
From a recent posting of mine in povray.advanced-users:

>Rafal 'Raf256' Maj wrote in message ...
>>Hi,
>>when data for photons and/or media can NOT be safle loaded ?
>>I ques that camera moving/rotation is alwys safe, and any other changes is
>>scene (objects or lights) is not safe - is this correct ?
>
>
>Moving the camera is always safe.  Moving lights that do not cast photons is
>always safe.  Moving objects that do not have photons shot at them, that do
>not recieve photons, and would not recieve photons in the new location is
>always safe.  Moving an object that recieves photons to a new location where
>it does not recieve photons is sometimes safe.  Moving an object to a
>location where it recieves photons, moving an object that has photons shot
>at it, or moving a light that casts photons is not safe.
>
>Changing the texture of an object that recieves photons is safe.  Changing
>the texture of an object that has photons shot at it produces results that
>are not realistic, but can be useful sometimes.

In general, changes to the scene geometry require photons to be re-shot.
Changing the camera parameters or changing the image resolution does not.

-- 
Mark

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