> 
> I does not look like it is an ideal cut. It seems like there is a "hole"
> in the culet of the diamond. This hole should not be there. 

My understanding is that the small facet at the 
bottom of the diamond is called the culet.

There seems to be many opinions about what is the 
best cut for a brilliant diamond.

I now think that I made the culet a little too big.

To make the culet facet smaller one would have to 
increase the 8.2 value a bit in the plane { -y, 8.2 }
statement in the Brilliant declaration.

To remove the culet facet, just delete this plane 
statement.

If the culet is made smaller or removed, then the 
-8.3 value in the bounded_by statement in should 
be lowered (more negative).


When I made this diamond shape, I spent much time 
searching the internet for information about the
geometry of diamonds.

I found most of the data I needed, but there were 
some data I could not find back then.

Therefore I'm not yet sure if all the facets are 
"right".


> See attached
> image. I played with photons and dispersionsettings until I was happy.
> 
> What do you think?

Thank you for rendering it with photons.

Now I'm sure that I like Photons very much !
I especially like the "fire" that appears
within the diamonds in your rendering.

I'm curious about how the code looks now.
Could you please post the code with your 
modifications for Photons ?

I read that Sigmund suggests placing the 
diamond closer to the floor to see the 
Photons.

Maybe it would then be wise to lower the 
reflection value for the blue "ground" 
plane so that the reflected diamond image 
does not destroy the caustics.


> Uhm, I'm not sure if I should tell you this, but my PIII 650 Mhz took 24
> minutes to render ed this image...

No, no, no, you shouldn't have told me that !


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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