 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
I tried o get familiar with photons and dispersion under povray. I found
this file on the net:
http://povray.sitewww.ch/?p=177
(For copyright reasons I will just post the link, not the file itself)
Now: under 3.7 I get a grey background, under 3.6 everything is fine. What
am I doing wrong? Have there been changes to the behaviour of photons? Or is
something broken in 3.7?
Are there any disperion examples availabe that work with 3.7?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
TC schrieb:
> Now: under 3.7 I get a grey background, under 3.6 everything is fine. What
> am I doing wrong? Have there been changes to the behaviour of photons? Or is
> something broken in 3.7?
Apparently there is a /lot/ of stuff wrong in 3.7 regarding this scene.
So far I found the following issues:
* Cylindrical light sources and photons don't appear to mix well in
POV-Ray 3.7.
* POV-Ray 3.7's current dispersion implementation is bogus in the
multiple respects:
- At the first interface taking account dispersion, POV-Ray 3.7 does
split up the RGB ray into multiple "spectral" ones, but fails to apply
dispersion at this initial interface.
- When transmitting from one object that has dispersion directly into
another one that doesn't, POV-Ray 3.7 fails to take into account the
dispersion effects that should occur at this interface.
- At all other subsequent interfaces, POV-Ray erroneously applies the
same correctional factor to the IOR that should have been applied at the
very first dispersion interface.
I'll file a bug report to bugs.povray.org, and try to clean up that mess.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
clipka schrieb:
> * POV-Ray 3.7's current dispersion implementation is bogus in the
> multiple respects:
>
> - At the first interface taking account dispersion, POV-Ray 3.7 does
> split up the RGB ray into multiple "spectral" ones, but fails to apply
> dispersion at this initial interface.
This has actually turned out a misinterpretation of the source code on
my behalf. The other issues, however, still need fixing.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"TC" <do-not-reply@i-do get-enough-spam-already-2498.com> wrote:
> I tried o get familiar with photons and dispersion under povray. I found
> this file on the net:
>
> http://povray.sitewww.ch/?p=177
>
> (For copyright reasons I will just post the link, not the file itself)
>
> Now: under 3.7 I get a grey background, under 3.6 everything is fine. What
> am I doing wrong? Have there been changes to the behaviour of photons? Or is
> something broken in 3.7?
>
> Are there any disperion examples availabe that work with 3.7?
sure, Gaf just posted his water glass scene in p.b.i.
http://news.povray.org/povray.binaries.images/thread/%3Cweb.4adcba99fcd38e4fd84acf040%40news.povray.org%3E/?mtop=14
It uses caustics and cromatic dispersion in 3.7 beta 34.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Thank you for the reminder - I had seen the picture but did not notice the
source.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
I tried to render the file with point lightsource (I see dispersion though I
am pretty sure I should see a strip, not circles - 3.6 renders a strip).
With parallel light source the render fails after 5 minutes under 3.7.
Parallel light source stops with a "Slab building error" under 3.6 - it
gobbles up 2.5 GB of memory. (I am getting old - my first VIC had just 5kB
of memory - video and main-storage together).
I hope this helps.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
