Hello,
  Still messing around with the simulated translucency, trying out making a
lampshade.  Here's a scene I put around it.  Ironically I found that at this
scale the shades smaller details aren't really visible.  Regardless, as a WIP I
thought I'd share.

-The Mildly Infamous Blue Herring

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Attachments:
Download 'lamp_and_mirror_1.png' (402 KB)

Preview of image 'lamp_and_mirror_1.png'

"Blue Herring" <bhe### [at] tinfoilcatcom> wrote:
> Hello,
>   Still messing around with the simulated translucency, trying out making a
> lampshade.  Here's a scene I put around it.  Ironically I found that at this
> scale the shades smaller details aren't really visible.  Regardless, as a WIP I
> thought I'd share.
>
> -The Mildly Infamous Blue Herring

Looks good.  What method are you using?

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I think the shade is looking good. I am however, troubled by the focal blur 
(?) which made me wonder if something was wrong with my eyes. I have trouble 
to see the scene, with the exception of the lamp.

Thomas

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Thomas de Groot schrieb:
> I think the shade is looking good. I am however, troubled by the focal blur 
> (?) which made me wonder if something was wrong with my eyes. I have trouble 
> to see the scene, with the exception of the lamp.
> 
> Thomas 
> 
> 
No trouble at all here. Must be something with your eyes.

;-)

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"Hans Fink" <mas### [at] pecosnospamde> schreef in bericht 
news:47d53780$1@news.povray.org...
>>
> No trouble at all here. Must be something with your eyes.
>
> ;-)

Yes, I forgot my POV-glasses..... :-)

Thomas

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"Kirk Andrews" <kir### [at] tektonartcom> wrote:
> Looks good.  What method are you using?

Thanks.  It uses double illuminate and an area light + radiosity, with patterns
of varying ambient finish on the shade.  Nothing too different than my prior
lights really.

-The Mildly Infamous Blue Herring

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> I think the shade is looking good. I am however, troubled by the focal blur
> (?) which made me wonder if something was wrong with my eyes. I have trouble
> to see the scene, with the exception of the lamp.

Thanks.  Perhaps I was too aggressive with the blur, I don't use it all that
often.  Or possibly its the scale of the scene, its at 1cm = 1 pov unit.  It
uses the standard POV-Ray focal blur:

#declare Focus = <-30, 120, 170>;

camera {
  location <-50, 150, -50>
  up y
  right x * image_width/image_height
  look_at Focus
  #if(Use_Focal_Blur)
    aperture 9
    blur_samples 400
    focal_point Focus
    confidence 0.91
    variance 1/2000
  #end
}

Part of the reason for the rather high settings was that I was trying to get rid
of that graininess on the mirror border, which it largely failed to do.

-The Mildly Infamous Blue Herring

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"Blue Herring" <bhe### [at] tinfoilcatcom> schreef in bericht 
news:web.47d584cd76857e91ce5ce3790@news.povray.org...
>
> Part of the reason for the rather high settings was that I was trying to 
> get rid
> of that graininess on the mirror border, which it largely failed to do.
>

Maybe that would disappear with (higher) radiosity settings? Instead of 
focal blur.

Thomas

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> Maybe that would disappear with (higher) radiosity settings? Instead of
> focal blur.

Hmm, not sure, I thought I had fairly high settings, but perhaps I'm off
somewhere.  I'm using the two-pass method with the settings:

pretrace_start 0.32
pretrace_end   0.02
count 400
nearest_count 5
error_bound 1
recursion_limit 3
low_error_factor 0.5
gray_threshold 0
minimum_reuse 0.015
brightness 1
adc_bailout 0.01/0.4
normal off
media off

-The Mildly Infamous Blue Herring

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Blue Herring nous apporta ses lumieres en ce 2008/03/14 14:26:
> "Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
>> Maybe that would disappear with (higher) radiosity settings? Instead of
>> focal blur.
> 
> Hmm, not sure, I thought I had fairly high settings, but perhaps I'm off
> somewhere.  I'm using the two-pass method with the settings:
> 
> pretrace_start 0.32
Changing the pretrace_start usualy have little to no effect. Keep the default of 
0.08.
Changing by some small value may, in some cases, get rid of some artefacts near 
corners.
> pretrace_end   0.02
Default value.
Try reducint this to 0.01, 0.005 or 0.0025
> count 400
Maybe a larger value here? Try 600 or 800.
> nearest_count 5
That's the default value.
You can go up to 20. Low effect on render time, can greatly improve end result.
> error_bound 1
> recursion_limit 3
Default value.
> low_error_factor 0.5
Meybe try a somewhat smaller value. Will take more time on the final pretrace step.
> gray_threshold 0
Default value.
> minimum_reuse 0.015
Default value.
You may need a value larger OR smaler. Don't go over 0.02. Don't go to small, as 
smaller values will increase the render time.
> brightness 1
Default value.
> adc_bailout 0.01/0.4
That's 0.025, probably to large. Try adc_bailout 0.01/3 or 0.01/4.
> normal off
Default value.
> media off
Default value.
> 
> -The Mildly Infamous Blue Herring
> 
Every time you use a default value, you can skip that option.

-- 
Alain
-------------------------------------------------
Keep your boss’s boss off your boss’s back.

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