"Alain" <ele### [at] netscapenet> wrote in message 
news:4a0a0d71$1@news.povray.org...
> Chris B nous illumina en ce 2009-05-12 16:44 -->
>>> "Marvin" <mto### [at] grfhr> wrote in message
>>>> Could you please give an example of a texture with grayscale gradient
>>
>> .. but thinking about it, you're probably better off using an 'onion'
>
> Even beter, use the spherical pattern.
> Have a value of 1 at the origin, that you translate to the camera 
> location, and a value of zero at 1 unit radius, scaled to the depth of 
> your scene.
> If you scale the onion pattern to small, it goes back to 1 where you want 
> black.

OTOH that makes it easier to spot any mistake if you accidentally scale the 
pattern too small ;)
You could of course use the onion pattern as a test to make sure the deepest 
depth is where you want it and use the spherical pattern for the final 
render (best of both worlds).

Regards,
Chris B.

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