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From: Rick Measham
Subject: Halfway done, and I think POVRay has a bug ...
Date: 24 Jun 2005 09:12:27
Message: <42bc06bb@news.povray.org>
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OK, so this render is taking forever and now it's halfway done, there's
a bug!
I'm sure I'm not the first to note this, but I've applied a focal blur.
Thus the buildings in the background are slightly out of focus and the
orb in the foreground is *in* focus. However, the buildings reflected in
it are further away from the camera (actually closer as the crow flies,
but further as the ray flies). But nonetheless, in the reflection,
they're *in* focus because the orb is in focus!
Is there any way to fix that??
(BTW: I built a macro to create the skyscrapers and put it on random
settings to get all the buildings. Happy to part with the source if
anyone wants it..)
ALSO, I couldn't build the orb out of blobs and have it look right, and
I have no idea how to make an isosurface such as this. Maybe I need a
mesh, but once again I have no idea. The smaller photo contains the
object I'm trying to draw... if anyone can offer suggestions I'd be, as
always, grateful.
Cheers and Thanks!
Rick Measham
P.S. I can't remember where I got the picture from! Gak! If anyone
recognises it, please yell out!
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Attachments:
Download 'halfway.png' (477 KB)
Download 'big_silver_ball_sm.jpg' (45 KB)
Preview of image 'halfway.png'
Preview of image 'big_silver_ball_sm.jpg'
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From: Christoph Hormann
Subject: Re: Halfway done, and I think POVRay has a bug ...
Date: 24 Jun 2005 09:50:03
Message: <d9h2r6$7j3$1@chho.imagico.de>
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Rick Measham wrote:
> I'm sure I'm not the first to note this, but I've applied a focal blur.
> Thus the buildings in the background are slightly out of focus and the
> orb in the foreground is *in* focus. However, the buildings reflected in
> it are further away from the camera (actually closer as the crow flies,
> but further as the ray flies). But nonetheless, in the reflection,
> they're *in* focus because the orb is in focus!
It's completely correct from both the raytracing and the physical
standpoint. If you'd magnify the view of the reflection so the building
are of comparable size to those in direct view you'd see the blur.
The blur on the building extends less than 1/10 of the height of a
'window' - and the windows in the reflection are only a few pixel high...
If you expect stronger blur in the reflection that usually is reflection
blur and not focal blur.
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 03 May. 2005 _____./\/^>_*_<^\/\.______
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"Rick Measham" <rickm*at%isite.net.au> wrote in message
news:42bc06bb@news.povray.org...
> OK, so this render is taking forever and now it's halfway done, there's
> a bug!
>
> I'm sure I'm not the first to note this, but I've applied a focal blur.
> Thus the buildings in the background are slightly out of focus and the
> orb in the foreground is *in* focus. However, the buildings reflected in
> it are further away from the camera (actually closer as the crow flies,
> but further as the ray flies). But nonetheless, in the reflection,
> they're *in* focus because the orb is in focus!
>
> Is there any way to fix that??
As a test, try putting a plane mirror in place of the orb.
The scaling issues for focal blur should be easier to determine. Either you
will see appropriate blurring (as expected) or not. The wideangle lensing
effect is possibly giving you pseudofocus.
DLM
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From: Rick Measham
Subject: Re: Halfway done, and I think POVRay has a bug ...
Date: 24 Jun 2005 10:04:09
Message: <42bc12d9@news.povray.org>
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Christoph Hormann wrote:
> It's completely correct from both the raytracing and the physical
> standpoint. If you'd magnify the view of the reflection so the building
> are of comparable size to those in direct view you'd see the blur.
Glad I didn't hit the stop button then!
I'm just a bit paranoid as I'm heading north of 24 hours at the moment.
One reason I think for the long render is all the reflections of
reflections of reflections in the building windows .. I'm exploring
options there in P.G.
Thanks and Cheers!
Rick Measham
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On Sat, 25 Jun 2005 00:04:13 +1000, Rick Measham wrote:
> I'm just a bit paranoid as I'm heading north of 24 hours at the moment.
24 hours is nothing. I'm still running the trace of blueblob (the one
that Slime posted) at a ray depth of 9, only about 1,400 hours running so
far.
About 300 lines more to go at 1400x1050. The image so far looks
*excellent*, but I want to compare it to a depth 3 image to see if the
difference is noticible.
Jim
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From: Anton Sherwood
Subject: Re: Halfway done, and I think POVRay has a bug ...
Date: 25 Jun 2005 02:08:24
Message: <42bcf4d8$1@news.povray.org>
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Rick Measham wrote:
> ALSO, I couldn't build the orb out of blobs and have it look right, and
> I have no idea how to make an isosurface such as this. Maybe I need a
> mesh, but once again I have no idea. The smaller photo contains the
> object I'm trying to draw... if anyone can offer suggestions I'd be, as
> always, grateful.
To get the obvious out of the way, have you tried a blob of a sphere
(possibly stretched) and a negative cylinder?
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From: Thomas de Groot
Subject: Re: Halfway done, and I think POVRay has a bug ...
Date: 25 Jun 2005 03:22:22
Message: <42bd062e$1@news.povray.org>
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"Rick Measham" <rickm*at%isite.net.au> schreef in bericht
news:42bc06bb@news.povray.org...
>
> (BTW: I built a macro to create the skyscrapers and put it on random
> settings to get all the buildings. Happy to part with the source if
> anyone wants it..)
>
Always interesting! I am a little bit of a compulsive macro collector, a bit
like Uncle Ken :-)
You never know,sometimes you can use it!!
So, please, yes, thank you indeed!!
> ALSO, I couldn't build the orb out of blobs and have it look right, and
> I have no idea how to make an isosurface such as this. Maybe I need a
> mesh, but once again I have no idea. The smaller photo contains the
> object I'm trying to draw... if anyone can offer suggestions I'd be, as
> always, grateful.
>
I suppose a mesh would be the easiest way to construct such an object. in
Wings3D or Silo it would take a couple of minutes.
Thomas
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Nice picture, Rick.
> P.S. I can't remember where I got the picture from! Gak! If anyone
> recognises it, please yell out!
Well, it's not the exact same picture, but this looks like the place:
http://flickr.com/photos/dcmeatloaf/12310291/
I hope this helps.
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From: Rick Measham
Subject: Arrrgh! (was: Re: Halfway done, and I think POVRay has a bug ...)
Date: 26 Jun 2005 00:10:39
Message: <42be2abf@news.povray.org>
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Jim Henderson wrote:
> 24 hours is nothing. I'm still running the trace of blueblob (the one
> that Slime posted) at a ray depth of 9, only about 1,400 hours running so
> far.
Total Scene Processing Times
Parse Time: 0 hours 0 minutes 7 seconds (7 seconds)
Photon Time: 0 hours 0 minutes 0 seconds (0 seconds)
Render Time: 58 hours 39 minutes 49 seconds (211189 seconds)
Total Time: 58 hours 39 minutes 56 seconds (211196 seconds)
rickm@laptop:~/sandbox/Skyscraper$ display skyscraper.png
display: Corrupt image `skyscraper.png'.
Luckily I know what happened, and I was going to re-render it anyway :)
Cheers!
Rick Measham
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Ouch - I hope something like that doesn't happen to my render (so far, so
good)
Jim
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