Posts by t00fri

by t00fri
17.03.2013, 13:53
Forum: Add-on development
Topic: Sprites model of Orion-like nebulae (WORK IN PROGRESS)
Replies: 27
Views: 7540

Re: Sprites model of Orion-like nebulae (WORK IN PROGRESS)

Cham wrote: We have the same rendering problem in the standard galactic blobs (gray sprites) as seen at close range or using the zoom feature of Celestia.

Correct. I am experimenting since a long time to improve on this issue.

F.
by t00fri
17.03.2013, 11:17
Forum: Add-on development
Topic: Sprites model of Orion-like nebulae (WORK IN PROGRESS)
Replies: 27
Views: 7540

Re: Sprites model of Orion-like nebulae (WORK IN PROGRESS)

Sorry guys, the Ibiblio server is still down, meaning that neither the Motherlode nor CelestialMatters is accessible! No idea what is going on there. Unfortunately, we cannot influence this. In the meantime... Here is a simple blend (pixel addition) of Cham's Neb5.jpg above with my celestia.Sci rend...
by t00fri
16.03.2013, 17:23
Forum: Add-on development
Topic: Uploading addons to the MotherLode
Replies: 27
Views: 13185

Re: Uploading addons to the MotherLode

Excellent, John!

Fridger
by t00fri
11.03.2013, 02:03
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

That sounds like the best procedure, certainly in this more exploratory stage.

F.
by t00fri
11.03.2013, 01:52
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

or just to carry on a bit towards a more Crab-like coloration etc... About the colors, what palette do you suggest to me for the Crab ? I can't trust the various pictures on the internet ; they are all false or exagerated colors. I need three RGB colors : center (approximately blue), middle (approx...
by t00fri
11.03.2013, 01:42
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

The background fog may be tricky in Celestia : Since there are several large sprites, they will add and make rendering confused. I did tried before, for my planetary nebulae. The effect isn't very satisfying. Even if the sprites are smaller (and more numerous), the fog effect will not be very convi...
by t00fri
11.03.2013, 01:27
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

or just to carry on a bit towards a more Crab-like coloration etc...
[click on image by all means!]
crab.jpg


F.
by t00fri
11.03.2013, 01:00
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

Here is a 5min exercise with GIMP of what I have in mind: ⋅ I used your above strings and moved the black background to alpha, which makes your randomWalk image transparent. This looks about like so (after rescaling to the size of my Perlin noise image above: strings.png Sorry this box doe...
by t00fri
11.03.2013, 00:42
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

Fridger, no, I didn't blurred the random walk yet. This is a project for the following months. For the moment, I need to concentrate on the supernova remnants (Crab-like nebulae). I still have an issue with sprites density at the tree-like intersections, which gives an un-natural rendering in Celes...
by t00fri
11.03.2013, 00:11
Forum: Add-on development
Topic: Planetary Nebula models (sprites)
Replies: 58
Views: 15388

Re: Planetary Nebula models (sprites)

Cham,

did you try blending your random walk strings with Perlin noise backgrounds? I use the very flexible 2D Perlin noise for irregular galaxy rendering etc. Here is a small example:

perlin.jpg


You can easily generate Perlin noise within your Mathematica box as well.

F.
by t00fri
26.02.2013, 18:00
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 574
Views: 106940

Re: Pictures from Celestia

argelesmer wrote:another 'square' nebula.
Square_neb.jpg

Credits, please!

Fridger
by t00fri
22.02.2013, 11:27
Forum: Celestia Users
Topic: CelestialMatters News
Replies: 131
Views: 90555

Re: CelestialMatters News

CelestialMatters is again up!

Fridger
by t00fri
22.02.2013, 09:42
Forum: Celestia Users
Topic: CelestialMatters News
Replies: 131
Views: 90555

Re: CelestialMatters News

Is CM down abruptly? :roll: No idea what is going on at Ibiblio.org!?? I am going to wait for another day and then I'll write them a mail to inquire. So far I did receive NOTHING. In the past down times at CelestialMatters aka Ibiblio.org were pleasingly rare... The Motherlode that is also hosted b...
by t00fri
16.02.2013, 22:17
Forum: Scripting
Topic: z-dist.celx
Replies: 5
Views: 5384

Re: z-dist.celx

First of all thanks for the quick response! All these distance(z) formulae are approximations only, with accuracy depending on the application under consideration. The equation you used in the "z-dist.celx" script is not an approximation, but it is an exact result for a matter dominated u...
by t00fri
16.02.2013, 19:44
Forum: Scripting
Topic: z-dist.celx
Replies: 5
Views: 5384

Re: z-dist.celx

All these distance(z) formulae are approximations only, with accuracy depending on the application under consideration. First of all you should realize that we are facing here a framework embedded in General Relativity. That implies that one has to carefully contemplate what distance means within GR...
by t00fri
11.02.2013, 17:18
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 574
Views: 106940

Re: Pictures from Celestia

Nice!

F.
by t00fri
10.02.2013, 12:44
Forum: Textures
Topic: Miranda Bump Map
Replies: 45
Views: 14525

Re: Miranda Bump Map

Saturn ?? see "stereo moons " http://stereomoons.blogspot.com OF COURSE the Saturn system with direct measurements of moon topography from the work of Dr. Paul Schenk, who is also a member of CM: http://forum.celestialmatters.org/viewtopic.php?t=391 His topographic maps of the icy Saturni...
by t00fri
04.02.2013, 14:46
Forum: Ideas & News
Topic: Drawing a better star
Replies: 82
Views: 89152

Re: Drawing a better star

Several years ago when ChrisL sent me the first version of his shader star patch, I noted already the above square artefacts in my Win 7/64 bit machine and told him about them. The bright shader stars consist of a core and a glare part, both rendered within a standard square region. If for some reas...
by t00fri
25.01.2013, 10:08
Forum: Bugs
Topic: Building Celestia SVN in Fedora 17
Replies: 14
Views: 9196

Re: Building Celestia SVN in Fedora 17

John, you don't need qtcreator to build trunk/celestia or (celestia.Sci) without autotools. As pioneered by me in DEV, celestia.pro now also includes a make install target and deals with distro-dependent name ambiguities via pkgconfig! F. PS: Let me know if you don't manage to figure it out. PPS: qt...
by t00fri
25.01.2013, 08:31
Forum: Bugs
Topic: Building Celestia SVN in Fedora 17
Replies: 14
Views: 9196

Re: Building Celestia SVN in Fedora 17

John, not sure what to make of your bug report. Which branch? Trunk? Here Makefile.am is not needed to build celestia (Qt). Just a valid Qt installation and celestia.pro. The Makefile is generated via the familiar qmake call. In celestia.Sci I have even deleted all auto-tools... In openSuSE 12.1 and...

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