For anyone interested in the Cornell Box used in testing computer
rendering, here is the address of original's "home page."

   http://www.graphics.cornell.edu/online/box/

It provides details on the history, use, and construction of the
Cornell Box. I should say "boxes" because there have been several
variations created over the years. My favorite section is the
"comparisons" page, where they compare a "laboratory-grade" photo of a
physical box, with an advanced computer rendering of the same box.

Later,
Glen Berry

( Remove the "7" from 7no### [at] ezwvcom to email me. )

Post a reply to this message

I like this. The comparison is astounding.

Post a reply to this message

"Glen Berry" <7no### [at] ezwvcom> wrote in message
news:pXYxOXE4D1XVOpeHh+OPfy4kamrN@4ax.com...
| For anyone interested in the Cornell Box used in testing computer
| rendering, here is the address of original's "home page."
|
|    http://www.graphics.cornell.edu/online/box/
|
| It provides details on the history, use, and construction of the
| Cornell Box. I should say "boxes" because there have been several
| variations created over the years. My favorite section is the
| "comparisons" page, where they compare a "laboratory-grade" photo of a
| physical box, with an advanced computer rendering of the same box.

Looking it over I can see how the most lit portions are the most off, while the
shadowy
areas are more accurate in the "room" part.  The two boxes in the room have very
different base edges, almost opposites.  Real room shows them to have spacing or
something where they meet the floor, rendering doesn't have any such gap.  Then
there's
the strange illumination at the near, bottom corner of the closest box as well as a
brightening far back top of it.  Also what appears to be a highlight showing up in the
real mirrored box on its top middle to right.
Much of it all seems a discrepancy of closed spaces and wide open spaces, counting
shadow/light boundaries as well.  Which to me feeble mentality means a simple linear
fix
or similar could be possible.  Or do I mean logarithmic?  Exponential? I have no idea,
but it's always fun to think about.

Bob

Post a reply to this message

Glen Berry <7no### [at] ezwvcom> wrote...
> For anyone interested in the Cornell Box used in testing computer
> rendering, here is the address of original's "home page."
>
>    http://www.graphics.cornell.edu/online/box/
>

Could someone please convert this to POV so we can test?  I realize that it
will be difficult to convert, because the colors will have to be converted
from the wavelength table to RGB triplets (with a significant loss of data).
Anyway, if anyone would do the conversion, I'd love to run some tests with
using MegaPov and Mr. Marty's indirect lighting models.

-Nathan

Post a reply to this message

Nathan Kopp wrote:
> 
> Glen Berry <7no### [at] ezwvcom> wrote...
> > For anyone interested in the Cornell Box used in testing computer
> > rendering, here is the address of original's "home page."
> >
> >    http://www.graphics.cornell.edu/online/box/
> >
> 
> Could someone please convert this to POV so we can test?  I realize that it
> will be difficult to convert, because the colors will have to be converted
> from the wavelength table to RGB triplets (with a significant loss of data).
> Anyway, if anyone would do the conversion, I'd love to run some tests with
> using MegaPov and Mr. Marty's indirect lighting models.

I can try to do that. I wrote a spectral space ray-tracing program a few
months ago. It can convert Spectral to RGB, so I guess I can compute the
RGB triplets necessary to run some tests.
I keep you in touch...

Stephane Marty
- - - - - - - -
Computer Graphics Software
http://perso.wanadoo.fr/albedo

Post a reply to this message

Nathan Kopp wrote:

> Anyway, if anyone would do the conversion, I'd love to run some tests with
> using MegaPov and Mr. Marty's indirect lighting models.

Nathan (and anybody else), if you're interested, I can leave a MegaPoV
0.5 release patched with my function on my site so you can easily
download it for the tests.

Stephane Marty
- - - - - - - -
Computer Graphics Software
http://perso.wanadoo.fr/albedo

Post a reply to this message

Stephane Marty wrote:

> I can try to do that. I wrote a spectral space ray-tracing program a few
> months ago.

Is it/src available for download/get somehow

TIA
Pabs

Post a reply to this message

Pabs wrote:
> 
> Stephane Marty wrote:
> 
> > I can try to do that. I wrote a spectral space ray-tracing program a few
> > months ago.
> 
> Is it/src available for download/get somehow

No it isn't. That was a specific application written for a commercial
demo.
If I have time one day, I will modify it to become a freeware
ray-tracer.

Stephane Marty
- - - - - - - -
Computer Graphics Software
http://perso.wanadoo.fr/albedo

Post a reply to this message