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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"?
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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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Thank you.
"Mark Wagner" <mar### [at] gte net> wrote in message
news:pan### [at] gtenet...
> 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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> 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"?
Usually no, but if you had very few photons in the 320 x 200 image - just
enough to make it look good - then when you increase the resolution you may
notice flaws. In that case you would have to increase count or decrease
spacing and reshoot them.
- Slime
[ http://www.slimeland.com/ ]
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