clipka <ano### [at] anonymousorg> wrote:
>    pigment {
>      gradient y
>      color_map {
>        perceptual
>        [0.0 rgb 0]
>        [0.5 rgb 1]
>        [1.0 rgb 0.5]
>      }
>    }

> (The example also showcases the problem with the poly_wave workaround 
> you mention, which only works for gradients running from [0.0 rgb 0] to 
> [1.0 Some_Color].)

  Now that you mention that, it's actually quite a problem. The
'poly_wave 2.2' indeed only works if you have one single color
transition from 0.0 to 1.0 in your color map (or pigment/texture map),
but doesn't work if there is more than one, as in your example. The
poly_wave function would have to be applied to every individual
transition, rather than the entire map, and this is just not possible.

  As far as I can tell, there is no way in pov3.7 to replicate a pov3.6
color map (in terms of perceptual brightness) other than using the
'assumed_gamma 2.2' backwards compatibility trick, which then affects
*all* colors, not just the color map.

-- 
                                                          - Warp

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