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The result we have so far looks much too bright. Just reducing the rainbow's color helps but it's much better to increase the translucency of the rainbow because it is more realistic if the background is visible through the rainbow.
We can use the transmittance channel of the colors in the color map to specify a minimum translucency, just like we did with the fog. To get realistic results we have to use very large transmittance values as you can see in the following example (rainbow2.pov).
rainbow {
angle 42.5
width 5
distance 1.0e7
direction <-0.2, -0.2, 1>
jitter 0.01
color_map {
[0.000 color r_violet1 transmit 0.98]
[0.100 color r_violet2 transmit 0.96]
[0.214 color r_indigo transmit 0.94]
[0.328 color r_blue transmit 0.92]
[0.442 color r_cyan transmit 0.90]
[0.556 color r_green transmit 0.92]
[0.670 color r_yellow transmit 0.94]
[0.784 color r_orange transmit 0.96]
[0.900 color r_red1 transmit 0.98]
}
}
The transmittance values increase at the outer bands of the rainbow to make it softly blend into the background.
A much more realistic rainbow.
The resulting image looks much more realistic than our first rainbow.
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