On 07/08/2018 11:29, Stephen wrote:
> No, don't follow my maths.
> 
> Using the data from this site. I did a quick model.
> http://www.alcyone.com/max/reference/scifi/ringworld.html
> I adjusted the Shadow square ring radius until the day/night cycle 
> looked equal.(multiplied the radius by 0.587587699)

A close up of the terminator on the Ringworld.
The area light does make a difference.
Using
  light_source {  // Light_Source2
   < 0.000000, 0.000000, 0.000000 >, colour rgb <1.000,1.000,1.000>*1.500
   area_light <3.400000,0.000000,0.000000>, 
<0.000000,3.400000,0.000000>, 23, 23

   circular
   orient
   adaptive 5

-- 

Regards
     Stephen

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