I've been re-rendering a scene.  The first image/example I'm showing is the
image rendered at 1280 x 1024.  The second image/example was rendered at
10240 x 7680 (much larger) but none of the settings were changed.  As you
can see the glass ashtray became black in the larger image.

I was under the impression that I didn't have to alter settings like the
max_trace_level (which is 25) when making larger images.  If I have to (it
LOOKS like I have to anyway) what is a good "rule of thumb" to calculate the
setting on an image that is larger (or smaller) than the original so that it
looks the same?

Patrick Dugan

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Attachments:
Download 'Cigarsml.jpg' (73 KB) Download 'Cigarbig.jpg' (29 KB)

Preview of image 'Cigarsml.jpg'

Preview of image 'Cigarbig.jpg'

"Patrick Dugan" <pat### [at] netinsnet> wrote in message
news:3da82030@news.povray.org...
> I've been re-rendering a scene.  The first image/example I'm showing is
the
> image rendered at 1280 x 1024.  The second image/example was rendered at
> 10240 x 7680 (much larger) but none of the settings were changed.  As you
> can see the glass ashtray became black in the larger image.
>
> I was under the impression that I didn't have to alter settings like the
> max_trace_level (which is 25) when making larger images.  If I have to (it
> LOOKS like I have to anyway) what is a good "rule of thumb" to calculate
the
> setting on an image that is larger (or smaller) than the original so that
it
> looks the same?
>

Max_Trace_Level just sets how many times a ray can be reflected or
refracted, changing the size of your output shouldn't have any effect on it
at all.
Are you sure you didn't change *anything* in the scene? (Maybe textures or
something)

-tgq

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I think you are right.  I must have changed the glass texture in the ashtray
somehow.  The glasses in the picture don't exhibit the same symptom so it
must be the texture.  Thanks!

"TinCanMan" <Tin### [at] hotmailcom> wrote in message
news:3da828a6$1@news.povray.org...
>
> "Patrick Dugan" <pat### [at] netinsnet> wrote in message
> news:3da82030@news.povray.org...
> > I've been re-rendering a scene.  The first image/example I'm showing is
> the
> > image rendered at 1280 x 1024.  The second image/example was rendered at
> > 10240 x 7680 (much larger) but none of the settings were changed.  As
you
> > can see the glass ashtray became black in the larger image.
> >
> > I was under the impression that I didn't have to alter settings like the
> > max_trace_level (which is 25) when making larger images.  If I have to
(it
> > LOOKS like I have to anyway) what is a good "rule of thumb" to calculate
> the
> > setting on an image that is larger (or smaller) than the original so
that
> it
> > looks the same?
> >
>
> Max_Trace_Level just sets how many times a ray can be reflected or
> refracted, changing the size of your output shouldn't have any effect on
it
> at all.
> Are you sure you didn't change *anything* in the scene? (Maybe textures or
> something)
>
> -tgq
>
>

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I hate to speculate without really knowing but sure seems to me someone
mentioned this kind of thing up in the past about rendering size + memory
usage + max_trace_level or something. I could be mistaken.

It might be worth a try to check to see if a global_settings {adc_bailout 0
max_trace_level YourMaxTraceLevel} fixes it or not. It should leave
max_trace_level as the sole factor involved (I think). If you find there
isn't anything wrong with the ashtray texture anyway that might be an
option. That's the only thing I could think of that might make a difference.
Unless a large amount of memory used matters in some way, which squelches
out the max_trace_level regardless of adc_bailout.

I really haven't had this experience to say one way or another, just thought
I'd bring it up.
--
Farewell,
Bob

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Well the only way I could know for certain is to go get an older version of
the same scene and render it and the new scene at the same (small) size and
see if the black still shows up in the new scene.  It did.  I then simply
replaced the modified section with the older code and now it is rendering
correctly.   It has been a major pain since this stupid picture takes 5
months to render at the larger size and I HATE waiting that long.


"hughes, b." <omn### [at] charternet> wrote in message
news:3da86e1e@news.povray.org...
> I hate to speculate without really knowing but sure seems to me someone
> mentioned this kind of thing up in the past about rendering size + memory
> usage + max_trace_level or something. I could be mistaken.
>
> It might be worth a try to check to see if a global_settings {adc_bailout
0
> max_trace_level YourMaxTraceLevel} fixes it or not. It should leave
> max_trace_level as the sole factor involved (I think). If you find there
> isn't anything wrong with the ashtray texture anyway that might be an
> option. That's the only thing I could think of that might make a
difference.
> Unless a large amount of memory used matters in some way, which squelches
> out the max_trace_level regardless of adc_bailout.
>
> I really haven't had this experience to say one way or another, just
thought
> I'd bring it up.
> --
> Farewell,
> Bob
>
>

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"Patrick Dugan" <pat### [at] netinsnet> wrote in 
news:3da87adc@news.povray.org

> this stupid picture takes 5 months 

woooooow ? what computer do You have ? 386 16 MB ?



-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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Just for S&Gs:

Why are you rendering something at 10240X7680  that seems like a massive
overkill!

JFM
"Patrick Dugan" <pat### [at] netinsnet> wrote in message
news:3da87adc@news.povray.org...
> Well the only way I could know for certain is to go get an older version
of
> the same scene and render it and the new scene at the same (small) size
and
> see if the black still shows up in the new scene.  It did.  I then simply
> replaced the modified section with the older code and now it is rendering
> correctly.   It has been a major pain since this stupid picture takes 5
> months to render at the larger size and I HATE waiting that long.
>
>
> "hughes, b." <omn### [at] charternet> wrote in message
> news:3da86e1e@news.povray.org...
> > I hate to speculate without really knowing but sure seems to me someone
> > mentioned this kind of thing up in the past about rendering size +
memory
> > usage + max_trace_level or something. I could be mistaken.
> >
> > It might be worth a try to check to see if a global_settings
{adc_bailout
> 0
> > max_trace_level YourMaxTraceLevel} fixes it or not. It should leave
> > max_trace_level as the sole factor involved (I think). If you find there
> > isn't anything wrong with the ashtray texture anyway that might be an
> > option. That's the only thing I could think of that might make a
> difference.
> > Unless a large amount of memory used matters in some way, which
squelches
> > out the max_trace_level regardless of adc_bailout.
> >
> > I really haven't had this experience to say one way or another, just
> thought
> > I'd bring it up.
> > --
> > Farewell,
> > Bob
> >
> >
>
>

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Photons...(I think)
:-)

-paul


Rafal 'Raf256' Maj wrote:

> "Patrick Dugan" <pat### [at] netinsnet> wrote in
> news:3da87adc@news.povray.org
> 
>> this stupid picture takes 5 months
> 
> woooooow ? what computer do You have ? 386 16 MB ?
> 
> 
>

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