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"Jim Kress" <kre### [at] kressworks com> wrote in message
news:3b32d0ba@news.povray.org...
> Here's another result using:
>
> method 3
> intervals 20
> samples 3,5
> confidence 0.999
> variance 1/1000
>
> What's going on with this? Looks like the sampling algorithm is not
> behaving properly.
I hadn't seen the number of layers your df3 might be made up of but that
intervals change suggests to me there are a few. Nathan Kopp has made the
method 3 somehow figure the intervals out on it's own (I'm guessing) and
maybe what you really need to do is increase the samples. I often use equal
numbers. Perhaps a samples 10,10 is okay for you? If not there's always
method 2 and samples 5,5 could possibly do well.
Bob H.
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Thanks. I'll give it a try.
Jim
"Bob H." <omn### [at] msn com> wrote in message
news:3b32f014@news.povray.org...
> "Jim Kress" <kre### [at] kressworks com> wrote in message
> news:3b32d0ba@news.povray.org...
> > Here's another result using:
> >
> > method 3
> > intervals 20
> > samples 3,5
> > confidence 0.999
> > variance 1/1000
> >
> > What's going on with this? Looks like the sampling algorithm is not
> > behaving properly.
>
> I hadn't seen the number of layers your df3 might be made up of but that
> intervals change suggests to me there are a few. Nathan Kopp has made
the
> method 3 somehow figure the intervals out on it's own (I'm guessing) and
> maybe what you really need to do is increase the samples. I often use
equal
> numbers. Perhaps a samples 10,10 is okay for you? If not there's always
> method 2 and samples 5,5 could possibly do well.
>
> Bob H.
>
>
Post a reply to this message
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OK. It turns out that, although media is supposed to be contained within a
unit cube, it really isn't.
If you lok at my inc file, you'll see I used a unit cube box to contain the
media so it could be rendered. Well, if I change the box specification from
box{ <0,1>
to
box{ <0,0,-2>, <2,2,2>
the problem goes away, as one can see in the attached image. Hopefully this
does not indicate there is a bug in megapov.
Thanks for your suggestions!
Jim
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Attachments:
Download 'rohf_density_001_5,5_samples_intervals_10_bounding_box_fixed.jpg' (27 KB)
Preview of image 'rohf_density_001_5,5_samples_intervals_10_bounding_box_fixed.jpg'
![rohf_density_001_5,5_samples_intervals_10_bounding_box_fixed.jpg](/povray.binaries.images/attachment/%3C3b337f3b%40news.povray.org%3E/rohf_density_001_5%2C5_samples_intervals_10_bounding_box_fixed.jpg?preview=1)
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"Jim Kress" <kre### [at] kressworks com> wrote in message
news:3b337f3b@news.povray.org...
> OK. It turns out that, although media is supposed to be contained within
a
> unit cube, it really isn't.
>
> If you lok at my inc file, you'll see I used a unit cube box to contain
the
> media so it could be rendered. Well, if I change the box specification
from
>
> box{ <0,1>
>
> to
>
> box{ <0,0,-2>, <2,2,2>
>
> the problem goes away, as one can see in the attached image. Hopefully
this
> does not indicate there is a bug in megapov.
I can't see that happening here, using spiral.df3 in place of your df3, the
media is contained within the 1 unit cube as described in the doc.
I thought perhaps it could be wave type but default is ramp_wave and looked
okay to me anyway. Most likely thing could be you are getting some sort of
perspective trouble. Make your box transmit 0.5 instead of 1 and you can
see where the sides are.
Bob H.
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Jim Kress wrote:
> Attached is a volumetric rendering using media. What is the best way
> (i.e. best quality for shortest rendering time) to get rid of the
> graininess and get nice, smooth colors?
I think it's quite pretty as is.
--
Anton Sherwood -- br0### [at] p0b0x com -- http://ogre.nu/
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Thanks.
Jim
"Anton Sherwood" <bro### [at] pobox com> wrote in message
news:3B3648D1.D868817C@pobox.com...
> Jim Kress wrote:
> > Attached is a volumetric rendering using media. What is the best way
> > (i.e. best quality for shortest rendering time) to get rid of the
> > graininess and get nice, smooth colors?
>
> I think it's quite pretty as is.
>
> --
> Anton Sherwood -- br0### [at] p0b0x com -- http://ogre.nu/
Post a reply to this message
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