On 10/14/2013 3:56 AM, Thomas de Groot wrote:
> First problem solved.
>
> 1) comment out the atmosphere.
>
> 2) In your cloud texture, replace the finish either by:
>
>    finish {ambient1 diffuse 1}    // no radiosity
>
> or:
>
>    finish {emission 1 diffuse 1}    // radiosity
>
> 3) In your cloud texture, replace the scale by:
>
>    scale ring_width/2000
>
> Now the clouds become visible above the camera. The scale is important
> for this view. The Ringworld is so incredibly huge that what looks right
> from space is only a grey expanse seen from ground level. Cloud patterns
> like on Earth would look tiny on the Ringworld.
>
> 4) The problem is your atmosphere which generates the artefact in the
> foreground of the image. This seems probably to be an epsilon effect but
> I am not so sure about that as without atmosphere the scene renders
> properly. I would like the opinion of experts on this.
>
> In any case replace the scattering by:
>
>    scattering {4, <0.1, 0.3, 1.0> * 1000000/ring_radius}
>
> This will make the atmosphere visible.
>
> See the attached image for the state of the art.
>
>
> Thomas

Thanks so much! I will try out these settings next time I do a close-up 
shot.


Mike
-- 
http://isometricland.net

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