This is Sigmund's diamond, but slightly modified.

I changed the pigment a little (pigment {color rgbt <.90,.90,1,.8> }),
including changing the filter to transmit.  I removed radiosity so that it
doesn't take forever to render and I changed the plane texture.

This is the result.  I like the prism effects that are clearly visible, but
unfortunately, the caustics almost totally disappeared.  I did not change
the number of photons from the original source file.
I find it looks more plastic, but it's still kind of nice.

It took 1h 14m to shoot the photons and 13h 26m to render.

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Attachments:
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Nice! First time I see this with dispersion. I agree with your pigment change,
I have rgb <.95,.95,.99> now, but why are you using transmit? 

I also have problems getting bright enough caustics. I can get fairly good
refractive caustics when I don't use reflective photons. As soon as I set
photons{reflection on} refractive caustics almost totally disappear.

I just thought of something: should there be a colour_map in the light
statements to get dispersion in the refractive caustics? I've tried to port
prism.pov to mega 0.5 syntax unsuccessfully so far.

Are you using spacing 0.01? In that case I'm impressed with your system. (1G
ram?)

sig
--
ICQ 74734588

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Maybe it's part of some costume jewelry  ;-)
Still looks good to me.

"Sigmund Kyrre Aas" <sig### [at] kyrrenet> wrote in message
news:393### [at] kyrrenet...
|
| I just thought of something: should there be a colour_map in the light
| statements to get dispersion in the refractive caustics? I've tried to port
| prism.pov to mega 0.5 syntax unsuccessfully so far.

Last I knew, the color_map was still required.

Bob

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> Nice! First time I see this with dispersion. I agree with your pigment
change,
> I have rgb <.95,.95,.99> now, but why are you using transmit?

Well, if you look at your 2 postings, the shadow directly beneath the
diamond is very dark.  This didn't seem right to me for some reason, I'd
expect some light to get through.  I thought it was maybe because the filter
was filtering too much light, so I thought I'd try transmit.  It made no
difference whatsoever.  Besides, since there is almost no colour to the
diamond, the end result is the same.  See the attached pic.  It's the exact
same code except with filter instead of transmit and no AA.

I got rid of that dark shadow by making the plane reflective.  :)

> Are you using spacing 0.01?

Yes.

> In that case I'm impressed with your system. (1G ram?)

It's just a PII 450 with 128MB of RAM.  Not using radiosity saved a lot of
time.

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Of course I'll forget the pic.

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On Thu, 8 Jun 2000 10:06:49 -0400, "Richard Dault" <rda### [at] yahoocom>
wrote:

>This is Sigmund's diamond, but slightly modified.
>
>I changed the pigment a little (pigment {color rgbt <.90,.90,1,.8> }),
>including changing the filter to transmit.  

It should still be filtering instead of transmitting. If you're
concerned about the dark shadow, try using an area light in
conjunction with a Cray :)


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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Richard Dault wrote:

> Well, if you look at your 2 postings, the shadow directly beneath the
> diamond is very dark.  This didn't seem right to me for some reason, I'd

The shadow is dark because of photons. The light (in pov: photons) refracts and appear

as bright spots, the rest of the shadow is black. To get around this you could use
several

equally bright light sources or <pause> radiosity. :)

sig
--
ICQ 74734588

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