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> Hi(gh)!
>
> On 13.11.2018 20:27, jr wrote:
>
>
> For Mars, the atmosphere is much too thick!
>
> See you in Khyberspace!
>
> Yadgar
Not Mars, nor Titan. Just a logical step further from the original test
file by Shuffle in povray.general. It is crude and would need more work
(some latitudinal banding for instance) but that is not the point presently.
I would like to note that I use isotropic scattering (type 1) for both
atmosphere and clouds. In the original code Shuffle used the
Henyey-Greenstein scattering model with a slight excentricity. I think
this use is only relevant when the camera is /inside/ the fog/cloud,
especially the excentricity. Outside, scattering type 1 (isotropic is
just as good and possibly faster. Think of being inside a fog bank and
seeing the Sun poke through, or being on a mountain side and look at a
fog bank from above.
In any case, the scene files is available in povray.general.
--
Thomas
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On 13-11-2018 20:25, Kenneth wrote:
> Thomas de Groot <tho### [at] degroot org> wrote:
>
>>
>> My second test. With cloud layer.
>>
>
> Both images are really nice. Great work.
>
>
Thanks! Possibly not entirely useful for the particular use of Shuffle
but certainly a basis for further investigation. The use within an
animation would be a challenge. However, that is discussed in
povray.general ;-)
--
Thomas
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Am 14.11.2018 um 08:46 schrieb Thomas de Groot:
> especially the excentricity. Outside, scattering type 1 (isotropic is
> just as good and possibly faster. Think of being inside a fog bank and
I don't think scattering type has much effect on speed; it doesn't
really change the algorithm, just a weighting function.
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On 14-11-2018 9:19, clipka wrote:
> Am 14.11.2018 um 08:46 schrieb Thomas de Groot:
>
>> especially the excentricity. Outside, scattering type 1 (isotropic is
>> just as good and possibly faster. Think of being inside a fog bank and
>
> I don't think scattering type has much effect on speed; it doesn't
> really change the algorithm, just a weighting function.
OK. I was not sure and thought it would make some difference, but I
never tested that of course. :-)
--
Thomas
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