On 07/08/2018 10:02, Thomas de Groot wrote:
> On 7-8-2018 10:20, Stephen wrote:
>> On 07/08/2018 07:42, Thomas de Groot wrote:
>>> On 7-8-2018 8:22, Stephen wrote:
>>>> On 06/08/2018 22:34, Mike Horvath wrote:
>>>>> On 8/6/2018 5:15 PM, Mike Horvath wrote:
>>>>>> An old scene, but I've been sprucing it up in preparation toward 
>>>>>> uploading it to the Object Collection. I can't remember if it's to 
>>>>>> proper scale however. Also I'm thinking there may be a little too 
>>>>>> much cloud cover.
>>>>>>
>>>>>>
>>>>>> Mike
>>>>>
>>>>>
>>>>> Also, due to the sun being an area light, the unlit regions are 
>>>>> much too small.
>>>>>
>>>>>
>>>>
>>>> I got similar results when I tried it. I suspect Larry Niven got his 
>>>> maths wrong. I had to move the shadow plates closer to the Ringworld 
>>>> to get the day/night cycle equal.
>>>>
>>>>
>> He is not the only one who got his maths wrong. Of course I meant 
>> closer to the star.
>>
>>>
>>> That, or scale down the area_light's effective surface. At this 
>>> planetary scale the area effect would be hardly noticeable imo.
>>>
>>
>> A point light gives the same result.
>>
> 
> Right. I would suggest then to test with a point light, following 
> Stephen's maths, then try some area_light until it fits.
> 

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)





-- 

Regards
     Stephen

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