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Op 07/02/2021 om 02:53 schreef Mike Horvath:
> On 10/13/2013 2:18 AM, posfan12 wrote:
>> Here's the scene file for my ringworld attempt. Any suggestions?
>> Especially on
>> how to make the atmosphere appear?
>>
>>
>> Mike
>>
>
> Some panoramas:
>
> http://isometricland.net/panorama/pannellum.htm?config=pano-ringworld-01.json
>
>
> http://isometricland.net/panorama/pannellum.htm?config=pano-ringworld-02.json
>
>
>
> Mike
Nicely done indeed. Media should not pose too much of a problem in this
context as you are outside of the atmosphere.
--
Thomas
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On 2/7/2021 2:41 AM, Thomas de Groot wrote:
> Nicely done indeed. Media should not pose too much of a problem in this
> context as you are outside of the atmosphere.
>
Well, I am on hour 13 of my current render. About 35% done.
Mike
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Op 07/02/2021 om 23:26 schreef Mike Horvath:
> On 2/7/2021 2:41 AM, Thomas de Groot wrote:
>> Nicely done indeed. Media should not pose too much of a problem in
>> this context as you are outside of the atmosphere.
>>
>
> Well, I am on hour 13 of my current render. About 35% done.
>
>
> Mike
I don't know. Just rendering your atmosphere, with a supporting ring
added, took me about 30 seconds. Probably other conditions prevail in
your scene (landscape? cloudscape? shadow squares? area_light sun?)
--
Thomas
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On 2/8/2021 2:35 AM, Thomas de Groot wrote:
> I don't know. Just rendering your atmosphere, with a supporting ring
> added, took me about 30 seconds. Probably other conditions prevail in
> your scene (landscape? cloudscape? shadow squares? area_light sun?)
>
Yes, the sun is a 6x6 (probably excessive) area light.
Without the atmosphere the scene takes about 2 hours to render.
Mike
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Op 08/02/2021 om 09:13 schreef Mike Horvath:
> On 2/8/2021 2:35 AM, Thomas de Groot wrote:
>> I don't know. Just rendering your atmosphere, with a supporting ring
>> added, took me about 30 seconds. Probably other conditions prevail in
>> your scene (landscape? cloudscape? shadow squares? area_light sun?)
>>
>
> Yes, the sun is a 6x6 (probably excessive) area light.
>
> Without the atmosphere the scene takes about 2 hours to render.
>
>
> Mike
I wonder if at that distance an area_light is really effective. A point
light (with parallel) would probably be much faster and without any
visual difference.
--
Thomas
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On 2/9/2021 2:36 AM, Thomas de Groot wrote:
> I wonder if at that distance an area_light is really effective. A point
> light (with parallel) would probably be much faster and without any
> visual difference.
>
The area light is necessary to create the fuzzy shadows. (Otherwise
shadows would have a sharp edge and the lighted regions would be larger
than the shadow regions IIRC.)
A 6x6 area light may be excessive though. Dunno.
Mike
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Mike Horvath <mik### [at] gmail com> wrote:
> The area light is necessary to create the fuzzy shadows. (Otherwise
> shadows would have a sharp edge and the lighted regions would be larger
> than the shadow regions IIRC.)
What if you gave the shadow squares a bit of transparency at the edges to allow
the formation of a penumbra on the ring? It's a cheap cheat, but it may go
WAAAY faster.
Also Martijn just posted this recently:
https://www.shadertoy.com/view/WsyBDz
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Op 10/02/2021 om 11:29 schreef Mike Horvath:
> On 2/9/2021 2:36 AM, Thomas de Groot wrote:
>> I wonder if at that distance an area_light is really effective. A
>> point light (with parallel) would probably be much faster and without
>> any visual difference.
>>
>
> The area light is necessary to create the fuzzy shadows. (Otherwise
> shadows would have a sharp edge and the lighted regions would be larger
> than the shadow regions IIRC.)
>
> A 6x6 area light may be excessive though. Dunno.
>
>
> Mike
Ah, yes. Forgot about the shadow squares indeed. I seem to remember now
that I had some trouble of the kind, back when I modelled the Ringworld
(ten years ago? I am not sure)
--
Thomas
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> On 2/9/2021 2:36 AM, Thomas de Groot wrote:
>> I wonder if at that distance an area_light is really effective. A
>> point light (with parallel) would probably be much faster and without
>> any visual difference.
>>
>
> The area light is necessary to create the fuzzy shadows. (Otherwise
> shadows would have a sharp edge and the lighted regions would be larger
> than the shadow regions IIRC.)
>
> A 6x6 area light may be excessive though. Dunno.
>
>
> Mike
If using adaptive, that 6x6 become 9x9.
As for using parallel... That would only work for a small part of the
ring. parallel can't be used when the light_source is surrounded by
shadow casting elements.
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On 10/13/2013 2:18 AM, posfan12 wrote:
> Here's the scene file for my ringworld attempt. Any suggestions? Especially on
> how to make the atmosphere appear?
>
>
> Mike
>
Latest code can be found here:
https://github.com/mjhorvath/Mike-Wikipedia-Illustrations/tree/master/Miscellaneous/ringworld
Mike
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