Well, after seeing some of the posts I thought I'd give 3.5's radiosity a
stab. I started with Rick(Kitty)'s settings for his "Outdoing Brazil" post
and went from there. There's one, dim light source (rgb 0.06) in the scene
and a few items with high diffuse/ambient settings (diffuse 0.8 ambient
0.8). Render time was 6h 30m 52s at 640*480.

Global settings were:

global_settings {
  adc_bailout 0.003922
  ambient_light <1.0,1.0,1.0>
  assumed_gamma 1.9
  hf_gray_16 off
  irid_wavelength <0.247059,0.176471,0.137255>
  max_intersections 64
  max_trace_level 20
  number_of_waves 10
  radiosity {
    brightness       13.804
    count            1100
    distance_maximum 0.0
    error_bound      0.0157
    gray_threshold   0.2119
    low_error_factor 0.0009
    minimum_reuse    0.1875
    nearest_count    3
    recursion_limit  1
  }
}

Any comments or advice, especially on help reducing the artifaacts, would be
appreciated.

Witherin

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Attachments:
Download 'rad_pyramid.jpg' (32 KB)

Preview of image 'rad_pyramid.jpg'

Hey David,

  Hi again!
 
> Any comments or advice, especially on help reducing the artifaacts, would be
> appreciated.

  I think you need a lower pretrace_end, perhaps .01. Also, do you have
a ceil?

--
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org/

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Hi David,

It looks like you may have hit the sampling quirk which I reported on
p.b-t - it shows up most with low error_bound values because the
radiosity samples are sharp and not averaged across the surfaces.
Hopefully a fix will come out in a not-too-distant beta.

Bye for now,
	Mike Andrews.

David Heys wrote:
> 
> Well, after seeing some of the posts I thought I'd give 3.5's radiosity a
> stab. I started with Rick(Kitty)'s settings for his "Outdoing Brazil" post
> and went from there. There's one, dim light source (rgb 0.06) in the scene
> and a few items with high diffuse/ambient settings (diffuse 0.8 ambient
> 0.8). Render time was 6h 30m 52s at 640*480.
> 
> Global settings were:
> 
> global_settings {
>   adc_bailout 0.003922
>   ambient_light <1.0,1.0,1.0>
>   assumed_gamma 1.9
>   hf_gray_16 off
>   irid_wavelength <0.247059,0.176471,0.137255>
>   max_intersections 64
>   max_trace_level 20
>   number_of_waves 10
>   radiosity {
>     brightness       13.804
>     count            1100
>     distance_maximum 0.0
>     error_bound      0.0157
>     gray_threshold   0.2119
>     low_error_factor 0.0009
>     minimum_reuse    0.1875
>     nearest_count    3
>     recursion_limit  1
>   }
> }
> 
> Any comments or advice, especially on help reducing the artifaacts, would be
> appreciated.
> 
> Witherin
> 
>  [Image]

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"David Heys" <sou### [at] gcinet> wrote in message
news:3bc723a9@news.povray.org...
> Well, after seeing some of the posts I thought I'd give 3.5's radiosity a
> stab. I started with Rick(Kitty)'s settings for his "Outdoing Brazil" post
> and went from there. There's one, dim light source (rgb 0.06) in the scene
> and a few items with high diffuse/ambient settings (diffuse 0.8 ambient
> 0.8). Render time was 6h 30m 52s at 640*480.
...
> Any comments or advice, especially on help reducing the artifaacts, would be
> appreciated.
>
> Witherin
>

Don't know how to help you with the radiosity (I'm just starting out myself),
but I like the image somehow.  The pyramid structure intrigues me.  I'm not sure
what it's supposed to be (if anything) but I like it.

Michael

--
camera{location<8,20>look_at<6,0,4>}light_source{<8,8>rgb 1}difference{union{
#macro M(D,J)#local R=asc(substr(D,J,1))-32;<div(R,10)*2,mod(R,10)>#end#macro
E(D,B,R)prism{-D,4+D,R#local C=1;#while(C<R+1)M(B,C)#local C=C+1;#end}#end E(
0," (2:FPKAD80* U_dZU"18)sphere{2,2}#macro T(N)cylinder{<9,-N,3><9,4+N,3>3-N}
#end T(0)}T(2)E(1"45LNXUK4"8)pigment{rgb x+y/2}}//(c)2001 MDJohnson(Redbeard)

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