The first error is probably due to the way I am calculating the angle 
between the camera and the light directions. Will see if I can make it more 
accurate

The second error is probably from reducing the angle for the second bow so 
that it would fit in the view during testing.

thanks for the feedback,

Mike


"Mike Williams" <nos### [at] econymdemoncouk> wrote in message 
news:HME### [at] econymdemoncouk...
> Wasn't it Mike Hough who wrote:
>>Put this together using Jaime's hf2iso.pov and a custom compile of pov in
>>which I altered the media code. Unfortunately the isosurface and media
>>didn't play well together, so I wound up killing the settings of the
>>isosurface in order to get it to render. Took 10 hours 30 minutes to 
>>render
>>this which is way too long.
>
> I notice two tiny errors.
>
> 1: Because of the way that bows are created, they always appear perfectly 
> perpendicular to the line of sight, so you never get a perspective effect 
> like that.
>
> 2: The gap between the two bows is way too narrow.
>
> On the up side, I see that you did include the Alexander's Band. Most 
> people who depict rainbows don't bother with that.
>
> -- 
> Mike Williams
> Gentleman of Leisure

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