I figured it was about time to learn how to USE Povray rather than just
tinker with it :)
To that end I've been experimenting with camera settings, and I noticed a
problem. If you look at the two scenes below, the only difference between
them is the aperture setting on the camera ( 0.0 vs. 0.4 ), yet the image
with focal blur is 'washed out'. Both are using Radiosity ( standard setting
5 ) and an area light, and both have anti-aliasing set to 0.3 - although the
focal blur feature seems to disable this when the aperture is >0. Is there a
way to prevent this washout without turning all the lights down? I apologize
if I'm just missing some simple setting that's in the documentation, but I
can't find it ATM :) I'm impressed both with the level of realism that focal
blur and radiosity add to an image, and the hit my rendering time takes :)

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Attachments:
Download 'camtest1.jpg' (12 KB) Download 'camtest2.jpg' (16 KB)

Preview of image 'camtest1.jpg'

Preview of image 'camtest2.jpg'

Yep, focal blur causes "wash out" alright, been brought up before. Not
sure if POV 3.1e has this fixed or not.


Charles Krause wrote:
> 
> I figured it was about time to learn how to USE Povray rather than just
> tinker with it :)
> To that end I've been experimenting with camera settings, and I noticed a
> problem. If you look at the two scenes below, the only difference between
> them is the aperture setting on the camera ( 0.0 vs. 0.4 ), yet the image
> with focal blur is 'washed out'. Both are using Radiosity ( standard setting
> 5 ) and an area light, and both have anti-aliasing set to 0.3 - although the
> focal blur feature seems to disable this when the aperture is >0. Is there a
> way to prevent this washout without turning all the lights down? I apologize
> if I'm just missing some simple setting that's in the documentation, but I
> can't find it ATM :) I'm impressed both with the level of realism that focal
> blur and radiosity add to an image, and the hit my rendering time takes :)
> 
>  [Image]
> 
>  [Image]

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Bob Hughes wrote in message <370C4D42.BD2E090B@aol.com>...
>Yep, focal blur causes "wash out" alright, been brought up before. Not
>sure if POV 3.1e has this fixed or not.
>
>


sounds to me like pov-ray cameras need a setting for exposure - and perhaps
one of those timer doo-hickeys so you can run around to the front and
raytrace yourself.

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<<sounds to me like pov-ray cameras need a setting for exposure - and
perhaps
one of those timer doo-hickeys so you can run around to the front and
raytrace yourself.>>


lol


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>doo-hickeys

oh yes, we should all have one of them, maybe even 2.

Rick

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HMMM... the focal blur really works well here, but I wonder if you can
compensate for the wash out by lowering the assumed gamma of global diffuse and
brilliances of all the textures... just a thought tho I'm not sure if they'll
work

Josh English
eng### [at] spiritonecom

Charles Krause wrote:

> I figured it was about time to learn how to USE Povray rather than just
> tinker with it :)
> To that end I've been experimenting with camera settings, and I noticed a
> problem. If you look at the two scenes below, the only difference between
> them is the aperture setting on the camera ( 0.0 vs. 0.4 ), yet the image
> with focal blur is 'washed out'. Both are using Radiosity ( standard setting
> 5 ) and an area light, and both have anti-aliasing set to 0.3 - although the
> focal blur feature seems to disable this when the aperture is >0. Is there a
> way to prevent this washout without turning all the lights down? I apologize
> if I'm just missing some simple setting that's in the documentation, but I
> can't find it ATM :) I'm impressed both with the level of realism that focal
> blur and radiosity add to an image, and the hit my rendering time takes :)
>
>  [Image]
>
>  [Image]

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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
 
<p>Tom Melly wrote:
<blockquote TYPE=CITE>Bob Hughes wrote in message <370C4D42.BD2E090B@aol.com>...
<br>>Yep, focal blur causes "wash out" alright, been brought up before.
Not
<br>>sure if POV 3.1e has this fixed or not.
<br>>
<br>>
<p>sounds to me like pov-ray cameras need a setting for exposure - and
perhaps
<br>one of those timer doo-hickeys so you can run around to the front and
<br>raytrace yourself.</blockquote>
That sounds too scary...
<br> 
<br> 
<p>--
<br>Bryan Valencia
<br>Software Services
<br><A HREF="http://www.209software.com">http://www.209software.com</A>
<br><A HREF="mailto:bry### [at] 209softwarecom">mailto:bry### [at] 209softwarecom</A>
<br> </html>

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Josh English wrote in message <370D0BD7.AD319F32@spiritone.com>...
>HMMM... the focal blur really works well here, but I wonder if you can
>compensate for the wash out by lowering the assumed gamma of global diffuse
and
>brilliances of all the textures... just a thought tho I'm not sure if
they'll
>work
>


A good suggestion :) It works too - I put in...

#declare pov = <-6,6,0>;
#declare pof = <2.5,0.5,0>;
#declare arp = 0.2;

global_settings
{
  #if (arp)
        assumed_gamma 1.5
  #else
        assumed_gamma 1.0
  #end
}


camera
{
  location  pov
  focal_point pof
  #if (arp)
        aperture  arp
        blur_samples 20
  #end
  direction 1.5*z
  right     4/3*x
  look_at   pof

}

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No, what they REALLY need is film... then I don't have to pay a small
fortune to get them done in a image setter ;-)

--
Lance.


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