"Rune" <new### [at] runevisioncom> wrote in message 
news:46e736ea$1@news.povray.org...
> Zeger Knaepen wrote:
>>    pigment {
>>        camera_view{[mask-scene camera settings]}
>>        pigment_map {
>>            [0 rgbt 1]
>>            [1 camera_view{[original camera settings]}
>>        }
>>    }
>
> This does not create the correct gradient. I'll demonstrate with a simpler 
> gradient:

I know, but you don't need the gradient: it's either completely 
transpansparent or it's completely opaque.  The colour of the pixel is 
defined by the first scene.

maybe I should have written it like this, to avoid confusion:

pigment {
    pigment_pattern {camera_view[mask-scene camera settings]} //forgot the 
pigment_pattern :)
    pigment_map {
        [.5 rgbt 1]
        [.5 camera_view{[original camera settings]}
    }
}

If you also want partial transparency, then it's a bit more complicated, and 
I believe you'll need to use functions.

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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