POV-Ray : Newsgroups : povray.binaries.animations : green gas cloud on checkered plane Server Time
3 Dec 2022 07:34:57 EST (-0500)
  green gas cloud on checkered plane (Message 20 to 29 of 29)  
<<< Previous 10 Messages Goto Initial 10 Messages
From: Jörg "Yadgar" Bleimann
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 02:57:00
Message: <5940de3c$1@news.povray.org>
Hi(gh)!

And also the Floyd-Steinberg dithered version...

YouTube only (as it is larger than 8 MB): 
https://www.youtube.com/watch?v=SH0C-3rh5Jk

Commodore 64 and Atari ST color mode versions may come later this year - 
I haven't yet implemented the corresponding features in YIP!

See you in Khyberspace!

Yadgar


Post a reply to this message

From: Thomas de Groot
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 03:31:08
Message: <5940e63c@news.povray.org>
On 14-6-2017 8:52, Thomas de Groot wrote:
> On 13-6-2017 19:03, Bald Eagle wrote:
>> Hmmm.
>> I think I _might_ know to what you're referring...
>> Are you sure it wasn't isocity by TEK?
>>
>>
http://news.povray.org/povray.binaries.images/thread/%3C47ec0047%40news.povray.org%3E/
>>
>>
>
> Oh no! This is a totally different approach. I had forgotten about Tek's
> city though. He never released it, did he?
>
> No, City7 /is/ Mike Williams' work.
>

An example.

[exceptionally here and not in p.b.i to keep discussions together]

-- 
Thomas


Post a reply to this message


Attachments:
Download 'mw_city7.png' (788 KB)

Preview of image 'mw_city7.png'
mw_city7.png


 

From: Kenneth
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 04:15:00
Message: <web.5940efda14c5bb48883fb31c0@news.povray.org>
Stephen <mca### [at] aolcom> wrote:


>
> Another thought that struck me would be to use Runes Particle System to
> make the cloud container. It can flow around obstacles.
>
Sounds interesting. I need to experiment with that; I probably already have it
somewhere...


Post a reply to this message

From: Stephen
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 05:32:59
Message: <594102cb$1@news.povray.org>
On 6/14/2017 9:12 AM, Kenneth wrote:
> Stephen <mca### [at] aolcom> wrote:
>
>
>>
>> Another thought that struck me would be to use Runes Particle System to
>> make the cloud container. It can flow around obstacles.
>>
> Sounds interesting. I need to experiment with that;

I can imagine that would be the case. :)
A while ago I made a bagatelle board with it. Maybe a bit of overkill 
for one particle. ;)

> I probably already have it
> somewhere...
>


It is still downloadable

http://runevision.com/3d/include/particles/

-- 

Regards
     Stephen


Post a reply to this message

From: Bald Eagle
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 08:00:00
Message: <web.5941245314c5bb48c437ac910@news.povray.org>
Huh,   I had never seen Mike's city scene.  That looks quite impressive.
Thanks for sharing :)



_Some_ of Tek's source is provided in the links:

It might give some hint as to how the iso city was made:

http://evilsuperbrain.com/gallery/misc/inc.php?file=gallery.php&bgID=-1&filter=cracklecity


Post a reply to this message

From: Kenneth
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 14:15:06
Message: <web.59417b4c14c5bb48883fb31c0@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:

>
> _Some_ of Tek's source is provided in the links:
>
> It might give some hint as to how the iso city was made:
>
>
http://evilsuperbrain.com/gallery/misc/inc.php?file=gallery.php&bgID=-1&filter=cracklecity

Wow, impressive-- especially this render...

http://evilsuperbrain.com/gallery/misc/index.php?image=cracklecity-up

Thanks for the link. (Using a crackle pattern to generate building shapes is
something I would never have thought of. The resulting architecture is quite
realistic-looking.) I remember seeing Tek's examples long ago, but I never
followed up on the hows-and-whys.


Post a reply to this message

From: Kenneth
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 14:45:00
Message: <web.5941832d14c5bb48883fb31c0@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:

>
> Note the 'extinction' value of 0. Although scattering media's extinction
> is good
> for producing self-shadowing, it presently can't take a color vector, just a
> float value. As-is, it creates a *complementary* color in the media (nearly
> PURPLE in this case.) That's realistic, of course-- a colored cloud *should*
> filter out lighting of that color-- ...

Hmm, *is* that complementary-color self-shadowing 'realistic' or not? There are
two ways of looking at it: If the green cloud FILTERS the incoming
full-frequency light source, then it's not realistic-- the shadows within the
media should be GREEN, just like the cloud. But if the green cloud ABSORBS the
green color from the incoming light, then a complementary color IS correct. So--
to state the obvious-- 'extinction' in scattering media is actually ABSORPTION
media in disguise. The only problem that arises is, extinction can't be made a
different color (or NO color); it takes its cue from the scattering media's main
color.

There are actually two different ways to construct a colored media with varying
density. A simple example...

(1)
media{
    scattering{1, rgb 10*<.5,1,.5> extinction 2.0} // color is here
         density{
                spherical
                color_map{
                        [.12 rgb 0]
                        [.37 rgb 1]
                         }
                }
       }

Or..
(2)
media{
    scattering{1, 10 extinction 2.0}
         density{
                spherical
                color_map{
                        [.12 rgb 0]
                        [.37 rgb <.5,1,.5>] // color is here
                         }
                }
       }

I haven't actually tested one vs. the other, using the latest beta release. But
I would assume that they produce identical results.


Post a reply to this message

From: Kenneth
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 14:55:00
Message: <web.5941864b14c5bb48883fb31c0@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
> ...the buildings here remind me of the City7 macros by Mike
> Williams. I wonder where those originated from. I looked but could not
> find their origin any more; not from Mike's site at least. I have them
> in my own system but others might be interested.
>

I haven't been able to find them either :-(  I'm definitely interested; if you
can manage to upload them here or elsewhere, I would be most appreciative :-)
This is one of those cool macros that I *should* have archived at the time, but
didn't.


Post a reply to this message

From: Kenneth
Subject: Re: green gas cloud on checkered plane
Date: 14 Jun 2017 23:35:00
Message: <web.5942004e14c5bb48883fb31c0@news.povray.org>
=?UTF-8?Q?J=c3=b6rg_=22Yadgar=22_Bleimann?= <yaz### [at] gmxde> wrote:
> Hi(gh)!
>

>
> Here it is: Atari ST monochrome mode (640 by 400 pixels...)
>

I think I like this one best. It reminds me of the look of 'live video' monitors
aboard spaceships, in science-fiction/horror movies. Whenever there's a real
NEED to see what's going on, in detail, the video camera suddenly seems to have
less-than-ideal quality-- especially when the monster is about to strike! (I'm
thinking Ridley Scott's ALIEN.)


Post a reply to this message

From: Thomas de Groot
Subject: Re: green gas cloud on checkered plane
Date: 15 Jun 2017 02:52:29
Message: <59422ead$1@news.povray.org>
On 14-6-2017 20:54, Kenneth wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> ...the buildings here remind me of the City7 macros by Mike
>> Williams. I wonder where those originated from. I looked but could not
>> find their origin any more; not from Mike's site at least. I have them
>> in my own system but others might be interested.
>>
>
> I haven't been able to find them either :-(  I'm definitely interested; if you
> can manage to upload them here or elsewhere, I would be most appreciative :-)
> This is one of those cool macros that I *should* have archived at the time, but
> didn't.
>

I shall put a zip file in p.b.scene-files. I am sure Mile will agree :-)

-- 
Thomas


Post a reply to this message

<<< Previous 10 Messages Goto Initial 10 Messages

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.