On 03/11/2016 09:33 AM, Clodo wrote:
> Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
>>     Hmmm... I don't know what I'm doing wrong, but even with a simple
>> test scene all I get is a black image. I'm using the latest alpha, and
>> it doesn't gives any error, but the ray count on the output is zero. Any
>> ideas?
>
>
> - I downloaded the official POV-Ray.
> - I downloaded this build (64 bit) and replace only the .exe in the POV-Ray
> official
> https://github.com/POV-Ray/povray/releases/tag/v3.7.1-alpha.8509766%2Bav119
> - Open, create jaime.pov with exactly your code above, render:
> http://www.clodo.it/host/images/a1c9425560bdcc869a362d71bfb6b11b339e3512.png
> (480000 rays count).
>
> Maybe you have a different Alpha build?
>

I am on Ubuntu 14.04 - as is Jamie normally - and using 
3.7.1-alpha.8514084.unofficial.

I am starting to wonder if this is another windows/unix difference. I 
think Christoph said something like a direction of 0 renders nothing. If 
I change Jamie's directional functions only to :

                    direction {
             function { sin(select(x,(x+0.5)*2,(x*2)) * 2 * pi - pi) * 
cos(pi / 2 - (1-(y+0.5))*pi) }
             function { sin(pi / 2 - (1-(y+0.5))*pi) }
         //  function { cos(select(x,(x+0.5)*2,(x*2)) * 2 * pi - pi) * 
cos(pi / 2 - (1-(y+0.5))*pi) }
             function { 1 }
           }

I do see a result though not the correct one. Guess I'll see if I can 
step back to 8509766 first.

Bill P.

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