Hi(gh)!

Following a thread on Jupiter images on p.o-t, I started to model some 
basic gas giant textures based on this (non-POV-Ray) tutorial:
https://www.seedofandromeda.com/blogs/49-procedural-gas-giant-rendering-with-gpu-noise
with color suggestions gleaned from here: 
http://visions2200.com/Articles/ExtrasolarSpeculations.html (the chapter 
"Color, Albedo and Temperature), I made a "cold Jovian" gas giant as 
attached below...

...but how do I get realistic storm systems? The ones at "Seed of 
Andromeda" do not look very convincing, they would have to drag in 
clouds in a spiralling rather than a straight way (like with the 
black_hole warp of POV-Ray). Is there some trick to achieve a "spiral warp"?

See you in Khyberspace!

Yadgar

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Attachments:
Download 'cold_jovian_gas_giant.png' (534 KB)

Preview of image 'cold_jovian_gas_giant.png'

On 14-7-2018 0:35, Jörg "Yadgar" Bleimann wrote:
> ...but how do I get realistic storm systems? The ones at "Seed of 
> Andromeda" do not look very convincing, they would have to drag in 
> clouds in a spiralling rather than a straight way (like with the 
> black_hole warp of POV-Ray). Is there some trick to achieve a "spiral 
> warp"?
> 

Just thinking aloud, not verified (yet) is it possible to add 'rotate 
<....>' to a black hole warp within the warp block?

-- 
Thomas

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Hi(gh)!

On 14.07.2018 08:46, Thomas de Groot wrote:

> Just thinking aloud, not verified (yet) is it possible to add 'rotate 
> <....>' to a black hole warp within the warp block?

Probably not, I tried scaling (to get more elongated warps), but got an 
error message! And, rotating would change only the orientation of the 
warp, not its internal structure...

See you in Khyberspace!

Yadgar

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On 14-7-2018 11:34, Jörg "Yadgar" Bleimann wrote:
> Hi(gh)!
> 
> On 14.07.2018 08:46, Thomas de Groot wrote:
> 
>> Just thinking aloud, not verified (yet) is it possible to add 'rotate 
>> <....>' to a black hole warp within the warp block?
> 
> Probably not, I tried scaling (to get more elongated warps), but got an 
> error message! And, rotating would change only the orientation of the 
> warp, not its internal structure...
> 

yes... You are right; I was thinking along another line though which 
involved an imaginary rotation/deformation of the pattern. No there of 
course.

This is a problem. One would need something like the cylindrical warp 
applied to the individual black holes... oh hell! I don't know how to 
solve this... :-(

-- 
Thomas

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I don't have anything to suggest in terms of adapting or implementing this, but
I was just looking around and found this.

http://news.povray.org/povray.binaries.images/message/%3C4cd5e4f2%40news.povray.org%3E/#%3C4cd5e4f2%40news.povray.org%3
E

Not sure if that's of any use at all....

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On 14-7-2018 21:10, Bald Eagle wrote:
> I don't have anything to suggest in terms of adapting or implementing this, but
> I was just looking around and found this.
> 
>
http://news.povray.org/povray.binaries.images/message/%3C4cd5e4f2%40news.povray.org%3E/#%3C4cd5e4f2%40news.povray.org%3
> E
> 
> Not sure if that's of any use at all....
> 
> 
> 

The problem is: how would you apply this to a black hole warp? I 
mentioned the cylindrical warp, but with spiral1 or spiral2 the problem 
would be the same. I have no idea at the moment.

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:

> The problem is: how would you apply this to a black hole warp? I
> mentioned the cylindrical warp, but with spiral1 or spiral2 the problem
> would be the same. I have no idea at the moment.

Right.   Just throwing ideas out to spark some brainstorming.
I'm assuming that at some point, someone will go "AHA!"

See "Black Hole" and "Tornado"
http://www.bugman123.com/Renderings/index.html

and let us not forget:
http://www.f-lohmueller.de/pov_tut/backgrnd/p_wat4.htm

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On 15-7-2018 23:45, Bald Eagle wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>> The problem is: how would you apply this to a black hole warp? I
>> mentioned the cylindrical warp, but with spiral1 or spiral2 the problem
>> would be the same. I have no idea at the moment.
> 
> Right.   Just throwing ideas out to spark some brainstorming.
> I'm assuming that at some point, someone will go "AHA!"
> 
> See "Black Hole" and "Tornado"
> http://www.bugman123.com/Renderings/index.html
> 
> and let us not forget:
> http://www.f-lohmueller.de/pov_tut/backgrnd/p_wat4.htm
> 

Yes, there are some pretty good whirlpool examples around in POV 
space... :-)

It is always what there is not that we want most urgently! ;-)

-- 
Thomas

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Hi(gh)!

On 15.07.2018 23:45, Bald Eagle wrote:

> Right.   Just throwing ideas out to spark some brainstorming.
> I'm assuming that at some point, someone will go "AHA!"
> 
> See "Black Hole" and "Tornado"
> http://www.bugman123.com/Renderings/index.html
> 
> and let us not forget:
> http://www.f-lohmueller.de/pov_tut/backgrnd/p_wat4.htm
> 
...but I need (for the time being - later on I would model real cloud 
layers with media) a kind of pattern modifier, not a 3D object!

See you in Khyberspace!

Yadgar

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One idea would be to use POV-Ray's BOXED pattern-- with a pigment_map composed
of *multiple* (averaged?) SPIRAL patterns inside it, each with some appropriate
colors and warp{turbulence...}-- as a way to apply separate 'decals' to various
places on the already-textured planet surface. (The 'outside' of the BOXED
pattern(s) could fade to transparency, so as not to look like the storms are
simply stuck on.) The idea is certainly not as 'realistic' as true fluid
dynamics, but it might work.

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