Image showing light refraction of inverted lenticular, but
Even though I have color set up white, my transparent material turns green.
I've tried all tehse settings:
   //   rgbft <1,1,1,0.9,0.1>
   //color transmit 1.0
   color red 1.0  green 1.0  blue 1.0  filter 1.0
If I use
 // color rgbt <1.000000, 1.000000, 0.000000, 0.000000>

I get no photons being generated.

Any ideas,
Sorry for newbie question


<

--

Post a reply to this message

Attachments:
Download 'lent_test3.JPG' (35 KB)

Preview of image 'lent_test3.JPG'

"Simon Dyer" <sim### [at] paradisenetnz> wrote:
> Image showing light refraction of inverted lenticular, but
> Even though I have color set up white, my transparent material turns green.
> I've tried all tehse settings:
>    //   rgbft <1,1,1,0.9,0.1>
>    //color transmit 1.0
>    color red 1.0  green 1.0  blue 1.0  filter 1.0

I think we'll need to see more or your scene file. What photon settings are
you using? What is in the interior{} block of your lenticular object?
What's its dispersion setting?

[In POV 3.5 there was a bug that produced greenish spots if fresnel &
conserve-energy were both used for a transparent object, but it was a
different shade of green]

> If I use
>  // color rgbt <1.000000, 1.000000, 0.000000, 0.000000>
> I get no photons being generated.

That's just opaque yellow.

What do you mean? That you don't see photon effects, or that POV doesn't
even shoot any photons?

> Any ideas, Sorry for newbie question

Since you're new, my advice is to try playing with the standard glass
textures (in glass.inc) first & modify them to see what happens before
trying to create your own transparent materials.

PS. Your scene is very dark. What's your gamma setting?

Post a reply to this message

The file was exported from 3DWin5 that comes with Rheinhart, from a 3dsMax
file. Quite pleased that I can raytrace models from 3dsmax, but of course
the textures dont come over properly. They are not transparent so I added to
make up the following settings....I'll attach the whole set of files -
that's probably tidier:

I noticed last night that I had no refractive setting on my material, but
that made no difference.

Simon

"PM 2Ring" <nomail@nomail> wrote in message
news:web.43997cef7988abeee47fda940@news.povray.org...
> "Simon Dyer" <sim### [at] paradisenetnz> wrote:
> > Image showing light refraction of inverted lenticular, but
> > Even though I have color set up white, my transparent material turns
green.
> > I've tried all tehse settings:
> >    //   rgbft <1,1,1,0.9,0.1>
> >    //color transmit 1.0
> >    color red 1.0  green 1.0  blue 1.0  filter 1.0
>
> I think we'll need to see more or your scene file. What photon settings
are
> you using? What is in the interior{} block of your lenticular object?
> What's its dispersion setting?
>
> [In POV 3.5 there was a bug that produced greenish spots if fresnel &
> conserve-energy were both used for a transparent object, but it was a
> different shade of green]
>
> > If I use
> >  // color rgbt <1.000000, 1.000000, 0.000000, 0.000000>
> > I get no photons being generated.
>
> That's just opaque yellow.
>
> What do you mean? That you don't see photon effects, or that POV doesn't
> even shoot any photons?
>
> > Any ideas, Sorry for newbie question
>
> Since you're new, my advice is to try playing with the standard glass
> textures (in glass.inc) first & modify them to see what happens before
> trying to create your own transparent materials.
>
> PS. Your scene is very dark. What's your gamma setting?
>

Post a reply to this message

Attachments:
Download 'lent_test3_p.inc.txt' (1 KB) Download 'lent_test3_a.inc.txt' (1 KB) Download 'lent_test3_c.inc.txt' (1 KB) Download 'lent_test3_g.inc.txt' (1 KB) Download 'lent_test3_l.inc.txt' (2 KB) Download 'lent_test3_m.inc.txt' (3 KB) Download 'lent_test3_o.inc.txt' (306 KB) Download 'lent_test3.pov.txt' (2 KB)

Getting closer to this problem with a smaller object - it seems the normals
are all messed up - got one image that looks like the ghost in the machine.
Suspecting the converter so , am now trying with the normals exported also
and parts of the sphere are now non coloured, but still some weird green tis
there. See pic 1&2.



"Simon Dyer" <sim### [at] paradisenetnz> wrote in message
news:439a1333@news.povray.org...
> The file was exported from 3DWin5 that comes with Rheinhart, from a 3dsMax
> file. Quite pleased that I can raytrace models from 3dsmax, but of course
> the textures dont come over properly. They are not transparent so I added
to
> make up the following settings....I'll attach the whole set of files -
> that's probably tidier:
>
> I noticed last night that I had no refractive setting on my material, but
> that made no difference.
>
> Simon
>
> "PM 2Ring" <nomail@nomail> wrote in message
> news:web.43997cef7988abeee47fda940@news.povray.org...
> > "Simon Dyer" <sim### [at] paradisenetnz> wrote:
> > > Image showing light refraction of inverted lenticular, but
> > > Even though I have color set up white, my transparent material turns
> green.
> > > I've tried all tehse settings:
> > >    //   rgbft <1,1,1,0.9,0.1>
> > >    //color transmit 1.0
> > >    color red 1.0  green 1.0  blue 1.0  filter 1.0
> >
> > I think we'll need to see more or your scene file. What photon settings
> are
> > you using? What is in the interior{} block of your lenticular object?
> > What's its dispersion setting?
> >
> > [In POV 3.5 there was a bug that produced greenish spots if fresnel &
> > conserve-energy were both used for a transparent object, but it was a
> > different shade of green]
> >
> > > If I use
> > >  // color rgbt <1.000000, 1.000000, 0.000000, 0.000000>
> > > I get no photons being generated.
> >
> > That's just opaque yellow.
> >
> > What do you mean? That you don't see photon effects, or that POV doesn't
> > even shoot any photons?
> >
> > > Any ideas, Sorry for newbie question
> >
> > Since you're new, my advice is to try playing with the standard glass
> > textures (in glass.inc) first & modify them to see what happens before
> > trying to create your own transparent materials.
> >
> > PS. Your scene is very dark. What's your gamma setting?
> >
>
>
>

Post a reply to this message

Attachments:
Download 'testSphereConcat.JPG' (7 KB) Download 'testSphere-WhyGreen.JPG' (5 KB)

Preview of image 'testSphereConcat.JPG'

Preview of image 'testSphere-WhyGreen.JPG'

I found the problem, or at least the solution, still dont understadn where
the green came from, but I had dispersion on and for some reason my shapes
always dispersed to green.  With dispersion 1.0, the green goes away.  Stil
some eird textures inside my spehere though.

        interior {ior 1.10 dispersion 1.0 dispersion_samples 7}




"Simon Dyer" <sim### [at] paradisenetnz> wrote in message
news:439ad328@news.povray.org...
> Getting closer to this problem with a smaller object - it seems the
normals
> are all messed up - got one image that looks like the ghost in the
machine.
> Suspecting the converter so , am now trying with the normals exported also
> and parts of the sphere are now non coloured, but still some weird green
tis
> there. See pic 1&2.
>
>
>
> "Simon Dyer" <sim### [at] paradisenetnz> wrote in message
> news:439a1333@news.povray.org...
> > The file was exported from 3DWin5 that comes with Rheinhart, from a
3dsMax
> > file. Quite pleased that I can raytrace models from 3dsmax, but of
course
> > the textures dont come over properly. They are not transparent so I
added
> to
> > make up the following settings....I'll attach the whole set of files -
> > that's probably tidier:
> >
> > I noticed last night that I had no refractive setting on my material,
but
> > that made no difference.
> >
> > Simon
> >
> > "PM 2Ring" <nomail@nomail> wrote in message
> > news:web.43997cef7988abeee47fda940@news.povray.org...
> > > "Simon Dyer" <sim### [at] paradisenetnz> wrote:
> > > > Image showing light refraction of inverted lenticular, but
> > > > Even though I have color set up white, my transparent material turns
> > green.
> > > > I've tried all tehse settings:
> > > >    //   rgbft <1,1,1,0.9,0.1>
> > > >    //color transmit 1.0
> > > >    color red 1.0  green 1.0  blue 1.0  filter 1.0
> > >
> > > I think we'll need to see more or your scene file. What photon
settings
> > are
> > > you using? What is in the interior{} block of your lenticular object?
> > > What's its dispersion setting?
> > >
> > > [In POV 3.5 there was a bug that produced greenish spots if fresnel &
> > > conserve-energy were both used for a transparent object, but it was a
> > > different shade of green]
> > >
> > > > If I use
> > > >  // color rgbt <1.000000, 1.000000, 0.000000, 0.000000>
> > > > I get no photons being generated.
> > >
> > > That's just opaque yellow.
> > >
> > > What do you mean? That you don't see photon effects, or that POV
doesn't
> > > even shoot any photons?
> > >
> > > > Any ideas, Sorry for newbie question
> > >
> > > Since you're new, my advice is to try playing with the standard glass
> > > textures (in glass.inc) first & modify them to see what happens before
> > > trying to create your own transparent materials.
> > >
> > > PS. Your scene is very dark. What's your gamma setting?
> > >
> >
> >
> >
>
>
>

Post a reply to this message

Attachments:
Download 'testSphere.JPG' (11 KB)

Preview of image 'testSphere.JPG'

Simon Dyer nous apporta ses lumieres en ce 2005-12-11 03:55:
> I found the problem, or at least the solution, still dont understadn where
> the green came from, but I had dispersion on and for some reason my shapes
> always dispersed to green.  With dispersion 1.0, the green goes away.  Stil
> some eird textures inside my spehere though.
> 
>         interior {ior 1.10 dispersion 1.0 dispersion_samples 7}
> 
> 
> 
dispersion 1 = NO dispersion

-- 
Alain
-------------------------------------------------
Christian Science #2: Shit happening is all in your mind.

Post a reply to this message

Hi Simon,

You ARE seing photons, lots of them. If you delete the photons setting in
the global_settings block (in your file "lent_test3_a.inc") you'll get an
image like this (no_photons.png).


And, perhaps if you use this include file perhaps set:
count 1000000
instead of
space 0.03
That'll reduce the number of photons to 1 Mio and renders much faster. Do
this at least when you're testing.


Your last posting:
I don't know what this test sphere is all about.

To your idea with the normals:
See next post.

Yours,
Bu.

Post a reply to this message

Attachments:
Download 'no_photons.png' (32 KB)

Preview of image 'no_photons.png'

Hi again,

To the idea of doing refraction with normals:
I made a test render with a flat box containing a bump_map of an image white
in the middle and black at the edges.

Doing a photon render with this is not really convincing.

See zip file.


Yours,
Bu.

Post a reply to this message

Attachments:
Download 'pho_norm_on.zip' (96 KB)

"Simon Dyer" <sim### [at] paradisenetnz> wrote:
> I found the problem, or at least the solution, still dont understadn where
> the green came from, but I had dispersion on and for some reason my shapes
> always dispersed to green.  With dispersion 1.0, the green goes away.  Stil
> some eird textures inside my spehere though.
>
>         interior {ior 1.10 dispersion 1.0 dispersion_samples 7}

Aha!  I think i found something.  I had suspected that dispersion had
something to do with it, and your dispersion 1.0 trial confirms it.

From lent_test3.pov:
> interior {ior 1.10 dispersion 1.2 dispersion_samples 3}

I've noticed that photons don't quite honor the dispersion count; it is as
if the photons undercount the dispersion_samples by 2.  With your
dispersion_samples set at 3, you'll only have one color to work with--the
middle color of the spectrum, *green*.

(I haven't attempted to report this as a bug because it's less painful to
increase dispersion_samples by 2 than to bother the POV Team.)

Also, be careful with your dispersion compared to your ior.  At ior 1.1
dispersion 1.2, if i understand this right (not guaranteed!), the red will
not refract at all.

Post a reply to this message

Cousin Ricky nous apporta ses lumieres en ce 2005-12-12 22:15:

> Also, be careful with your dispersion compared to your ior.  At ior 1.1
> dispersion 1.2, if i understand this right (not guaranteed!), the red will
> not refract at all.
> 
> 
You prompted me to do a small test:
	interior{ior 1.2 dispersion 1.5 dispersion_samples 44}
Using a simple prism with rgbt 3 to boost the spectra brightness.
The red does refract a little. If I raise the dispersion to 1.6, the red refract UP

-- 
Alain
-------------------------------------------------
'the' is a registered trademark of Microsoft Corporation

Post a reply to this message

Attachments:
Download 't8.jpg' (2 KB)

Preview of image 't8.jpg'