[Radiance-general] Multiple spherical glow sources?

[Jack de Valpine]

Hi Mark,

One additional thought that occurred to me this weekend. To simplify 
processing your star map through mksource (if this is the way you go), 
it might make sense to downsample (significantly) the super large hdr 
image and then sample it back up to some manageable size. This should 
smear out the values. Feeding this to mksource might then be easier.

-Jack

Andrew McNeil wrote:
> Hi,
>
> Lars - why not use the relevant pixels from the first run in the final
> image?
>
> Model 1 - low res radiance map
> Model 2 - uniform white sky
> Model 3 - high res star map
>
> rpict -ab 5 mod1.oct > pic1.hdr //high quality rendering
> rpict -ab 0 mod2.oct > mask.hdr //image mask - black and white pixels
> rpict -ab 0 mod3.oct > pic3.hdr //direct only rendering, starry sky
>
> Use the mask to replace sky pixels with pixels of the starry sky:
>
> pcomb -e 'Ro=if(Ri(2),Ri(3),Ri(1) etc...'  \
>        pic1.hdr mask.hdr pic3.hdr > final.hdr
>
>
> This was my initial thought when I saw Mark's query, but I thought an all
> encompassing model (ala Jack's mksource suggestion) would probably fit
> better.  I'm not sure how practical three images and pcomb is with M. Stock
> sized pre-filtered renderings.  But given the complexity of the subsequent
> responses, maybe a dumber solution is more practical?
>
> Andy  
>
>
>
> On 9/15/09 7:11 PM, "Lars O. Grobe" <grobe at gmx.net> wrote:
>
>   
>> Hi again...
>>     
>>> I am not sure whether it is possible to force radiance to reuse an
>>> ambient file without doing further refinement on it (...)
>>>       
>> Thinking about this again... the fool-proof way would be to use the
>> simplified map for a first rendering run, derive ambient values from it
>> and use these as -av values with -ab 0 and the high-res map in later
>> runs. This should give you very fast and noise-free results...
>>
>> Cheers, Lars.
>>
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>
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-- 
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction

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