POV-Ray : Newsgroups : povray.binaries.images : Motecarlo path tracing with MegaPov 1.2.1 : Re: Motecarlo path tracing with MegaPov 1.2.1 Server Time
2 Aug 2024 12:22:55 EDT (-0400)
  Re: Motecarlo path tracing with MegaPov 1.2.1  
From: Jan Dvorak
Date: 24 Feb 2008 13:45:57
Message: <47c1bb65@news.povray.org>
Alain napsal(a):
> Jan Dvorak nous apporta ses lumieres en ce 2008/02/24 06:34:
>> Severi Salminen napsal(a):
> 
>>> And I love the results so far: it is so easy to make more realistic
>>> looking images with a path tracer than with "conventional" ray tracer
>>> IMO. Even the last sphere image I posted looks so natural to me. I
>>> wonder how easy it would be to reproduce it with POV.
>> using high radiosity settings with no conventional light source will 
>> do the same. I'm thinking of:
>> radiosity{
>>   error_bound 0        //to prevent any reuse
>>   count 1              //to prevent getting damn slow
>>   pretrace_start 1     //
>>   pretrace_end 1       //these won't be used either.
>>   minimun_reuse 0      //necessary
>>   normal on           //this won't hurt the performance
>>   #declare s=seed(Parse_String(date("%Y%y%j%H%M%S")))
>>   #declare d=VRand_On_Sphere(s);
>>   #if(d.y<0)
>>     d=-d;
>>   #end
>>   samples{1,d}
>>   randomize on         //a (lame) attempt to randomize the sample space.
>>                        //adapt adc_bailout and max_recursion as you like
>> }
>> The problem is that the light ray always reaches the surface at the 
>> same angle (different from ray to ray). This might (and will) produce 
>> artifacts (honestly, I'm interested in these artifacts), it might even 
>> go all wrong (the first bunce will be OK).
>>
> Sory, but there is no samples nor randomize in the radiosity settings.
> samples is a media quality setting.
> There is no "randomize" keyword.
> 
this is a megapov feature

-- 
the ultimate time-killer:
+a0.0 +am2 +r9

Johnny D


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