Hello,

i am a new POVRay-User with ab Question.
I Rendering this Picture and i see little "Black-Points/Pixel", max_trace_level
is up to 256. In other Picture are the Shadows not smooth but consist of
points...
Anyone ideas?

Picture with Black-Points:

http://s1.directupload.net/file/d/2684/5426qjr5_png.htm

AA ist +a0.1

Thanks

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Le 21/10/2011 14:06, cartun nous fit lire :
> Hello,
> 
> i am a new POVRay-User with ab Question.
> I Rendering this Picture and i see little "Black-Points/Pixel", max_trace_level
> is up to 256. In other Picture are the Shadows not smooth but consist of
> points...
> Anyone ideas?
> 
> Picture with Black-Points:
> 
> http://s1.directupload.net/file/d/2684/5426qjr5_png.htm
> 
> AA ist +a0.1
> 

which version of povray ? 3.6 or less, or 3.7RC3 ?

Also, focal blur seems in use...

If you want soft shadow, you need some area light of relevant dimension,
and that's slowing down the rendering.

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Hello,

tanks for your Message.
My Version is:  Version 3.6.1 (Debian  (x86_64-linux-gnu-g+
+ 4.4.5 @ x86_64-pc-linux-gnu))

And yes, i used the area_light:
[code]
#include "textures.inc"
#include "metals.inc"
#include "colors.inc"
#global_settings{max_trace_level 256}
camera{
 location<4,3,-12>
 look_at<0,0,0>
 //focal_point<0,0,0>
 //aperture 0.9
 //blur_samples 100
 //confidence 1
 //variance 1/128
}

light_source{
 <0,0,0> White
 area_light
 <0,0,0> <3,0,3>
 5,5
 adaptive 0
 jitter
 translate<-10,11,-4>

}
[/code]

The Shadows from the boxes.. :

http://s1.directupload.net/file/d/2684/b6n884qk_png.htm

Thanks for Ideas!

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Am 21.10.2011 16:40, schrieb cartun:

> My Version is:  Version 3.6.1 (Debian  (x86_64-linux-gnu-g+
> + 4.4.5 @ x86_64-pc-linux-gnu))

You can't use both focal blur and anti-aliasing at the same time with 
version 3.6.1; with focal blur activated, that version of POV-Ray will 
automatically ignore any anti-aliasing settings, and rely solely on 
focal blur to do that job.

I suggest using the latest 3.7.0 release candidate; it has some 
improvements to focal blur (including, but not limited to, the ability 
to use anti-aliasing at the same time), which might already help with 
your spotty artifacts.

> The Shadows from the boxes.. :
>
> http://s1.directupload.net/file/d/2684/b6n884qk_png.htm

The "cut-outs" at the near corner of the shadows indicate that "adaptive 
0" isn't enough, and you should use "adaptive 1" instead.

As for the graininess: You can probably improve that by using a higher 
resolution of the area light, e.g. "9,9" instead of "5,5"; using even 
more aggressive anti-aliasing might help as well.


I also notice that your area light is not square; is that intentional, 
or did you mean to use "area_light <0,0,3> <3,0,0>"?

(You might also want to try "circular orient", unless you're 
specifically aiming for a square light source.)

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Hello,

thank you for all the Informations!
A Light-Area with 9,9 make it better, thank you very mutch!

I am happy.. i love POVRay :)

bye bye and greets from Germany!

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