It is currently Tue, 23-10-18, 3:13 GMT

All times are UTC




Post new topic Reply to topic  [ 96 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 7  Next
Author Message
 Post subject:
PostPosted: Sun, 28-10-07, 20:37 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
BobHegwood wrote:
Note to Dr. Schrempp...

I read your reference papers, but I'm afraid that most of this is way
beyond my educational background. Still, I did appreciate the references,
As always, thanks from Bob


Bob,

thanks for letting me know where "you stand". Did you have a try at these amazing cloud simulations? That's worthwhile even if trigonometry and all that might not be you glass of beer ;-)

Cheers,
Fridger

PS: Sorry for the bad CM turnaround today. The Ibiblio server is said to have had considerable DNS resolution problems. Now everything seems fine again.

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Sun, 28-10-07, 23:48 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
Celestia's "Mie" Sunset on Mars...

Image

And once more for direct comparison, the real view as recorded recently (April 15, 2015) by NASA's Curiosity Mars rover.
Attachment:
blueSunsetMars.jpg
blueSunsetMars.jpg [ 19.23 KiB | Viewed 1991 times ]

http://www.jpl.nasa.gov/spaceimages/det ... d=PIA19401

Bye Fridger

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 29-10-07, 0:15 GMT 
Offline
Site Admin
User avatar

Joined: Thu, 30-08-07, 22:52 GMT
Posts: 2726
Location: France, South, not far from Montpellier
t00fri wrote:
Celestia's "Mie" Sunset on Mars...

Image

Bye Fridger


:shock:

Seems pretty nice... Any view from a distance to match the photo you post previously?

BTW, with this color matching topic with Selden's pict, I wonder now if we see the same thing... :x


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 29-10-07, 4:35 GMT 
Offline
User avatar

Joined: Sat, 13-10-07, 18:18 GMT
Posts: 373
ElChristou wrote:
:shock:

Seems pretty nice... Any view from a distance to match the photo you post previously?

BTW, with this color matching topic with Selden's pict, I wonder now if we see the same thing... :x


Nice view there doctor, but - just to enlighten me - could you please tell
me what render path you're using? Also, you're on XP correct? The
reason I'm asking is because it's becoming painfully clear to me that
NOTHING on my version of Celestia is performing as it should. More
specifically, see my User Message on that OTHER board concerning
render paths and the new version of Celestia. I REALLY think that I need
to downgrade to XP. Can you help me make a decision by telling me
what you're using?

Thanks, Brain-Dead

_________________
Brain-Dead Geezer Bob
Windows 8.1 Home Premium
AMD A8-5500 APU with Radeon HD Graphics
8.00 GB RAM, 64-bit Operating System
HP Hardware


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 29-10-07, 9:00 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
BobHegwood wrote:
ElChristou wrote:
:shock:

Seems pretty nice... Any view from a distance to match the photo you post previously?

BTW, with this color matching topic with Selden's pict, I wonder now if we see the same thing... :x


Nice view there doctor, but - just to enlighten me - could you please tell
me what render path you're using? Also, you're on XP correct? The
reason I'm asking is because it's becoming painfully clear to me that
NOTHING on my version of Celestia is performing as it should. More
specifically, see my User Message on that OTHER board concerning
render paths and the new version of Celestia. I REALLY think that I need
to downgrade to XP. Can you help me make a decision by telling me
what you're using?

Thanks, Brain-Dead


Bob,

my desktop is on Linux and my notebook is on Win XP, both are usually running on my desk. Mostly, I am using Linux if not stated differently.

Bye Fridger

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 29-10-07, 9:02 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
ElChristou wrote:

:shock:

Seems pretty nice... Any view from a distance to match the photo you post previously?

BTW, with this color matching topic with Selden's pict, I wonder now if we see the same thing... :x


Sure, it looks very much like the photo. The much harder task is to get the yellow-orange daylight sky with the same set of parameters.

I will display my results, when content.

Bye Fridger

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 18:57 GMT 
Offline
User avatar

Joined: Thu, 25-10-07, 15:20 GMT
Posts: 992
Location: NE PA, USA
I noticed a new folder and files in celestia/src/tools. It has a program called scattersim.cpp and various cfg files. I'm not sure how to use this though.
cartrite


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 21:22 GMT 
Offline
User avatar

Joined: Wed, 05-09-07, 0:09 GMT
Posts: 57
Location: Seattle, WA, USA
cartrite wrote:
I noticed a new folder and files in celestia/src/tools. It has a program called scattersim.cpp and various cfg files. I'm not sure how to use this though.
cartrite


Scattersim is a tool for experimenting with techniques for simulating atmospheric scattering. It uses a simple (and slow) ray tracer to render atmospheres using equations based on Nishita's. Atmospheres are simulated with three populations of particles: Rayleigh scattering, Mie scattering, and absorbing. The scale heights and scattering coefficients can be set separately for each set of particles in a cfg file. There are several of these cfg files in the directory along with the scattersim tool. You can build scattersim on Windows with the command line:

nmake /f scattersim.mak CFG=Release

And run it:

scattersim earth.cfg

It produces a PNG file with four separate camera views of a planet with the atmospheric described in the cfg file. I hope to use scattersim to produce lookup tables for realistic, high-quality atmosphere rendering in Celestia. Here's a sample of what to expect, produced by scattersim from titan.cfg.

Image

--Chris


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 21:43 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
Yes, indeed,

this program is fun and very instructive!

F.


PS: Chris is lacking an avatar. This will be punished in CM by the request of 17 candy bars, 1 Laotian Pizza , 3 German beers and 4 Norwegian Brandys ;-)

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 22:26 GMT 
Offline
User avatar

Joined: Wed, 05-09-07, 0:09 GMT
Posts: 57
Location: Seattle, WA, USA
t00fri wrote:
Yes, indeed,

this program is fun and very instructive!

F.


PS: Chris is lacking an avatar. This will be punished in CM by the request of 17 candy bars, 1 Laotian Pizza , 3 German beers and 4 Norwegian Brandys ;-)


In that spirit, I've changed my avatar to a glass of absinthe. When mixed with water, it's a great demonstration of wavelength dependent scattering. White light shining from behind the glass appears reddish, while there's a bluish-white cast when the light is on the same side of the glass as the viewer.

--Chris


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 22:30 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
Progress, to which we will have to get used to ;-)

But anyway...accepted.

F.

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 22:31 GMT 
Offline
Site Admin
User avatar

Joined: Thu, 30-08-07, 22:52 GMT
Posts: 2726
Location: France, South, not far from Montpellier
chris wrote:
t00fri wrote:
Yes, indeed,

this program is fun and very instructive!

F.


PS: Chris is lacking an avatar. This will be punished in CM by the request of 17 candy bars, 1 Laotian Pizza , 3 German beers and 4 Norwegian Brandys ;-)


In that spirit, I've changed my avatar to a glass of absinthe. When mixed with water, it's a great demonstration of wavelength dependent scattering. White light shining from behind the glass appears reddish, while there's a bluish-white cast when the light is on the same side of the glass as the viewer.

--Chris


No, no sorry Chris, that's not scattering, that's the effect of absinthe! :lol:


Last edited by ElChristou on Tue, 13-11-07, 22:44 GMT, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 22:44 GMT 
Offline
Site Admin
User avatar

Joined: Thu, 30-08-07, 22:52 GMT
Posts: 2726
Location: France, South, not far from Montpellier
chris wrote:
...You can build scattersim on Windows with the command line:

nmake /f scattersim.mak CFG=Release


DW, any chance to have this on osX?


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 22:56 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4583
Location: Hamburg, Germany
ElChristou wrote:
chris wrote:
...You can build scattersim on Windows with the command line:

nmake /f scattersim.mak CFG=Release


DW, any chance to have this on osX?


But of course. You just need to be able to compile and have the libpng ready.

...and sorry you must ask DW to write you a neat little Makefile ;-)

F.


Top
 Profile  
 
 Post subject:
PostPosted: Tue, 13-11-07, 23:04 GMT 
Offline
Site Admin
User avatar

Joined: Thu, 30-08-07, 22:52 GMT
Posts: 2726
Location: France, South, not far from Montpellier
t00fri wrote:
But of course. You just need to be able to compile and have the libpng ready.

...and sorry you must ask DW to write you a neat little Makefile ;-)

F.


Well, that's precisely the kind of stuff were DW is still indispensable for us osX end users... :|

Chris, quick question, your code above need OGL2 to render the scene? (or it's a pure raytrace?)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 96 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 7  Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group