On 8/8/2018 5:35 PM, Stephen wrote:
> On 08/08/2018 22:02, Mike Horvath wrote:
>> On 8/8/2018 1:05 PM, Stephen wrote:
>>> On 08/08/2018 15:08, Mike Horvath wrote:
>>>> Okay, I uploaded my scene to here:
>>>>
>>>>
http://lib.povray.org/searchcollection/index2.php?objectName=Ringworld&version=2.0&contributorTag=SharkD

>>>>
>>>>
>>>> I also attached my latest render to this post. The shadow squares' 
>>>> widths now match what was apparently stated in the books. The 
>>>> shadowed regions on the ring look much better now.
>>>>
>>>> However, I had to double the height of the shadow squares in order 
>>>> to block out the sun. See the parameter 
>>>> `RWorld_Shadow_Square_Width`. I'm not sure why this was necessary, 
>>>> as the original height was equal to the sun's diameter, and should 
>>>> have fully blocked its light.
>>>>
>>>
>>> Do the two area_light vectors <Axis_1> and <Axis_2> extend beyond the 
>>> star's volume?
>>>
>>
>> 1. the axis lengths are equal to the sun's diameter

Oops! I screwed up here. See my other post. They're fixed now.



>> 2. the area light is circular and oriented
>> 3. the sun's diameter should be equal to the shadow squares' height 
>> according to Niven's website
> 
> Just a check list.
> I just noticed that the data I was looking at was from the game. Oops.
> 

Here's a scan from the game:

https://img.fireden.net/tg/image/1464/06/1464060167901.jpg

The shadow squares seem much smaller than they should be.



> 
>> 4. an array of point lights in the shape of a sphere does not suffer 
>> from the issues I'm experiencing
>>
> 
> How do you do that without them clustering at the poles?
> 
> 

I don't. They do cluster! I should investigate a "good enough" sphere 
packing formula.



>>
>>>> Oh well.
>>>>
>>>>
>>>
>>> I like the image especially the shadows cast by the shadow squares in 
>>> the solar wind. :)
>>>
>>
>> Thanks!
>>
>>
>>> Unfortunately I don't have CIE.inc or lightsys.inc installed. :(
>>>
>>>
>>
>> I use them in nearly everything. Not sure why. Probably just habit.
>>
>>
> Probably a good habit to have.
> 
> 
>

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