When I set the user defined camera / projection to 
direction {
  function { 0 }
  function { 0 }
  function { 0 }
}
it 'traces to nowhere' and renders black, which makes sense. But now I ran 
into one where it doesn't.
I'm creating a tile rendering camera for displaying images with 
leaflet.js. Tiles are 256x256, but the aspect ratio of the image/ camera 
settings may be different, thus creating black borders.
Is it possible and does it make sense to have POV-Ray to render a 
transparant pixel instead of black when an output file format is used that 
supports transparancy?

ingo

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