Here is my 2nd model. It's an insulin syringe, the bottle and cap come next.
This is also my first try at global illumination. I'm not too happy with the
shadows but It took forever just to get rid of the artifacts. The materials
are kinda crappy too. Also needs an imagemap... gee.. looks like I'm FAR
from finished with this one. Any critiques welcome!

Corey

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Attachments:
Download 'insulin.png' (164 KB)

Preview of image 'insulin.png'

Very nice model.
The materials of course need some work. Especially the glass-plastic: it looks like
you used a pretty low ior.

I would lower error_bound to get better shadows (~0.1, but it's quite slow). For this
kind of scenes try something like:

radiosity {
pretrace_start 1 (or 0.08)
pretrace_end 1 (or 0.02)
count 300 (or, better 400 or, even better...)
error_bound 0.1 (even better 0.05)
recursion_limit 1 (the sky_sphere does a good job. There's usually no need to use a
higher recursion_limit).
}

Remember to use an appropriate max_trace_level to get rid of the polka dots (actually
I couldn't find any in your image, so either you have already done it or you're not
using reflecting materials).

Anyway a very good 2nd model!

--
Jonathan.

"Corey Woodworth" <cdw### [at] mpinetnet> ha scritto nel messaggio
news:3c8eee48@news.povray.org...
> Here is my 2nd model. It's an insulin syringe, the bottle and cap come next.
> This is also my first try at global illumination. I'm not too happy with the
> shadows but It took forever just to get rid of the artifacts. The materials
> are kinda crappy too. Also needs an imagemap... gee.. looks like I'm FAR
> from finished with this one. Any critiques welcome!
>
> Corey
>
>
>

Post a reply to this message

"JRG" <jrg### [at] hotmailcom> wrote in message
news:3c8ef260@news.povray.org...
> Very nice model.

Thanks! Coming from you thats pretty cool :)

> The materials of course need some work. Especially the glass-plastic: it
looks like
> you used a pretty low ior.

I agree, and yes I did use a low ior, but its not suppose to look glassy at
all. When
looking at my source it didn't look like it was refracting much at all. The
main
problem I have with the plastic is that it is much too clear and I don't
know how to
fix that. A real syringe is much hazier. The white circular part of the
plunger that
is visible through the plastic should look blurry.

> I would lower error_bound to get better shadows (~0.1, but it's quite
slow). For this
> kind of scenes try something like:
>
> radiosity {
> pretrace_start 1 (or 0.08)
> pretrace_end 1 (or 0.02)
> count 300 (or, better 400 or, even better...)
> error_bound 0.1 (even better 0.05)
> recursion_limit 1 (the sky_sphere does a good job. There's usually no need
to use a
> higher recursion_limit).
> }

I'll play around with those settings. I just noticed how low I set my count.
That was
probably my biggest mistake.

> Remember to use an appropriate max_trace_level to get rid of the polka
dots (actually
> I couldn't find any in your image, so either you have already done it or
you're not
> using reflecting materials).

They're arn't any, but on all my pre-renders where the shadows looked better
they were
plentiful. I'll try your settings.

> Anyway a very good 2nd model!

Thanks again.

Corey

> --
> Jonathan.
>
> "Corey Woodworth" <cdw### [at] mpinetnet> ha scritto nel messaggio
> news:3c8eee48@news.povray.org...
> > Here is my 2nd model. It's an insulin syringe, the bottle and cap come
next.
> > This is also my first try at global illumination. I'm not too happy with
the
> > shadows but It took forever just to get rid of the artifacts. The
materials
> > are kinda crappy too. Also needs an imagemap... gee.. looks like I'm FAR
> > from finished with this one. Any critiques welcome!
> >
> > Corey
> >
> >
> >
>
>

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> The main problem I have with the plastic
> is that it is much too clear and I don't know
> how to fix that. A real syringe is much hazier

You need subsurface scattering. In other words: Media inside the plastic.
With the right settings, this will look great but the rendertime will
explode.

You can find code for 3S (S-ub S-urface S-cattering) a few days back here.

Otherwise pretty good model and maybe just with a lower transmit value, the
plastic will improve.

Regards,
Hugo

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Accurate looking model, but you definitely need media in the plastic as
others have said.

 -Shay


Corey Woodworth <cdw### [at] mpinetnet> wrote in message
news:3c8eee48@news.povray.org...

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Looks like I'm going to be the auto-contrast junky for this one .... :P
--



Skip

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Attachments:
Download 'insulin.jpg' (42 KB)

Preview of image 'insulin.jpg'

> You need subsurface scattering. In other words: Media inside the plastic.
> With the right settings, this will look great but the rendertime will
> explode.
>
> You can find code for 3S (S-ub S-urface S-cattering) a few days back here.
>
> Otherwise pretty good model and maybe just with a lower transmit value,
the
> plastic will improve.

I'm so lost. I've tried and tried to get the media to do what I want but it
never does. :( When I change the settings, even to some extremes I hardly
ever see a visible change and I can never get a cloudy texture going. I
really need some help, oh and yes I do have hollow on :)

Should I post some code in povray.text.scene-files?

Thanks,
Corey

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Corey Woodworth <cdw### [at] mpinetnet> wrote in message
news:3c9243c3@news.povray.org...
>
>
> Should I post some code in povray.text.scene-files?
>

Yes.

Post a reply to this message

"Shay" <sah### [at] simcopartscom> wrote in message
news:3c9248f0$1@news.povray.org...
>
> Corey Woodworth <cdw### [at] mpinetnet> wrote in message
> news:3c9243c3@news.povray.org...
> >
> >
> > Should I post some code in povray.text.scene-files?
> >
>
> Yes.
>
 ok i did just that :)

Corey

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YAY! I think I'm done! Global illumination is cool, but its not easy when
the majority of the object is transparent. At least not for a newbie like me
:) I took it out and put in an area light instead. Thanks for all the help
everyone!

Corey

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Attachments:
Download 'insulin3.jpg' (35 KB)

Preview of image 'insulin3.jpg'