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I believe I've RTFM on this one. I have a scene whose objects have
dimensions in units of big whole numbers-- 3000 radius, etc.-- and trying
radiosity.
Should any of the radiosity parms be scaled up for big objects-- do any of
them implicitly have units of "povray dimensions" to them?
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I think 'error_bound' is what you are looking for.
- Grim
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I dunno.
3.3.4.2.5 suggests that error_bound is fractional. Perhaps the answer, is
(hopefully) "No, no parms implicitly need to be scaled if you scale your
scene a few orders of magnitude".
"GrimDude" <a36### [at] bellsouth net> wrote in message
news:41dcae6f$1@news.povray.org...
>I think 'error_bound' is what you are looking for.
>
> - Grim
>
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"Greg M. Johnson" <gregj;-)565### [at] aolcom> wrote in message
news:41dcb18c$1@news.povray.org...
>I dunno.
>
> 3.3.4.2.5 suggests that error_bound is fractional. Perhaps the answer,
> is (hopefully) "No, no parms implicitly need to be scaled if you scale
> your scene a few orders of magnitude".
>
You can change variables to see how they effect the overall scene easily
enough. From "3.3.4.3 Tips on Radiosity"
<quote>
If you want to see where your values are being calculated set radiosity
count down to about 20, set radiosity nearest_count to 1 and set
gray_threshold to 0. This will make everything maximally patchy, so you will
be able to see the borders between patches. There will have been a radiosity
calculation at the center of most patches. As a bonus, this is quick to run.
You can then change the error_bound up and down to see how it changes
things. Likewise modify minimum_reuse.
</quote>
Well I know the effects of setting a value too low for a particular view.
- Grim
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gregj;-)565### [at] aolcom news:41dca837$1@news.povray.org
> Should any of the radiosity parms be scaled up for big objects-- do
> any of them implicitly have units of "povray dimensions" to them?
AFAIK one (and hopefully only) problem is with very small objects, or
camera that has small angle,
http://www.raf256.com/povray/bug/radiosity-orthographic
Ofcourse using _huge_ object could result in lost of precision and out of
double range errors, and AFAIK using objects with details < 1.0 could lead
to some shadow problems.
Btw, there fore I think it is best to create scene in with typical object
has about 100 units (like we create a model of ufo - start with sphere{0
100}, model of a room - box{-50,+50} and so on), and in with no datails are
smaller then 0.1 (with room example - if YOu are planning later to zoom-in
on some objects like cofee mug, or computer monitor perhaps start with 1000
unit room).
--
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics
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Seems like this would be pretty easy to test (not that I'm going to do it
just now). Simply make a simple cylinder/sphere/cube radiosity scene (on a
white surface of course) and then render with a particular variable (say
error_bound), scale it up by a huge factor, and test to see how changes in
the variable effect the overall.
- Grim
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Greg M. Johnson <gregj;-)565### [at] aolcom> wrote:
> I believe I've RTFM on this one. I have a scene whose objects have
> dimensions in units of big whole numbers-- 3000 radius, etc.-- and trying
> radiosity.
> Should any of the radiosity parms be scaled up for big objects-- do any of
> them implicitly have units of "povray dimensions" to them?
POV-Ray 3.1 had a problem with the overall scale of the scene when using
radiosity. The problem was fixed in POV-Ray 3.5, so the overall scale of
the scene should be irrelevant.
--
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}// - Warp -
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