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 CAD / Ray-Tracing / 1973
1972  |  1974
Subject: 
Re: trans black holes
Newsgroups: 
lugnet.cad.ray
Date: 
Thu, 4 Sep 2003 01:18:41 GMT
Viewed: 
1666 times
  
In lugnet.cad.ray, Gregory J. Overkamp wrote:
   One thing i found helps to eliminate these artifacts is to increase the max trace level. Assuming you are using the most recent version of j de haan’s radiosity files, this is quite easy. Its the fifth option in the series. Try 5 like it recommends, but you can go up to 20 or even higher until this disappears. Hope that helps a little...

Increasing the value of max_trace_level did the trick for me. Setting it back to 5 (the usual default) reduced but did not eliminate the artifacts for me. Setting it to 20 (as in the Raves library IIRC) or 25 (in Jeroen de Haan’s v1 radiosity files) was sufficient, if not necessarily efficient.

On the subject (from the Zenith post) of the trans-black recipe, I’ve found the RGB values in lugnetcolors.inc for NW02t: <0.333333333333333, 0.309259259259259, 0.266666666666667> to be too dark. Converting the ‘trans-brown’ RGB values in the color table recently posted to Peeron.com to decimals, I got: <0.74901961, 0.71764706, 0.69411765’> which is pretty close to the <0.725,0.7,0.7> in the Raves library.

For an example using this (with filter=0.9, transmit=0.1, and the other NW02t settings as in lugnetcolors.inc), rendered with the 2Bounce radiosity option and max_trace_level=25, see the canopy on: http://personalpages.chorus.net/abozzo/x5test.jpg.

--Tom



Message has 1 Reply:
  Re: trans black holes
 
"Tom Bozzo" <abozzo*nospam@midplains.net> wrote in message news:HKo0z5.204y@lugnet.com... (...) max (...) haan's (...) series. Try (...) it back (...) me. (...) v1 (...) The max_trace_level is in the 2.3 version. About the artifacts (or black (...) (21 years ago, 4-Sep-03, to lugnet.cad.ray)

Message is in Reply To:
  Re: trans black holes
 
(...) One thing i found helps to eliminate these artifacts is to increase the max trace level. Assuming you are using the most recent version of j de haan's radiosity files, this is quite easy. Its the fifth option in the series. Try 5 like it (...) (21 years ago, 3-Sep-03, to lugnet.cad.ray)

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