Celestia Forums

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.

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...

Excellent, John!

Fridger

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

F.

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...

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...

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


F.

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...

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...

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:



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

F.

argelesmer wrote:another 'square' nebula.

Square_neb.jpg

Credits, please!

Fridger

CelestialMatters is again up!

Fridger

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...

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...

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...

Nice!

F.

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...

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...

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...

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...