[Radiance-general] Alpha channel/object matte

[Kirk Thibault]

It was frustratingly hilarious trying to reverse engineer the "if" 
statement in the pcomb manual example that draws the dot.  I tried 
several times to put a conditional statement in the "if 
"like,'if(ri(1)<0.05,0,1)' and kept getting errors associated with a 
')' expected.  Finally I realized that the condition was an expression 
implicitly compared to 0.  Then i realized that there was a built-in 
functional language and that this was not standard Unix syntax.  Then I 
realized there were whole reference sections devoted to the functional 
language in the book and on the website.  The knowledge base just keeps 
expanding... too bad my little brain can't oftentimes keep up.  
Thankfully this forum is here and I hope I am not testing people's 
patience with my inane questions.  Thanks folks.

kirk

On Nov 19, 2004, at 12:41 PM, Greg Ward wrote:

> The functional language in Radiance probably falls into the 
> "write-only" category, because it's so difficult to comprehend what's 
> been written.  I probably spend more time trying to figure out what I 
> did later than I spent doing things in the first place with it.  Oh, 
> well.  At least it was easy to code....
>
> -Greg
>
>> From: Kirk Thibault <kthibault at biomechanicsinc.com>
>> Date: November 19, 2004 9:35:52 AM PST
>>
>> Cool - I was having issues dealing with transparent objects as I was 
>> working through my own crude solutions - will try this one too.  Once 
>> again - Radiance has its own freakin functional language - nice!  
>> What a ton I have to learn!
>>
>> kirk
>
>
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