Celestia Forums

I must admit that a beer in pint has nothing to do with a beer in half a litre.
Simply does'nt taste the same

I am thinking of adding some random perturbations in the coloring and transparency to add some "life" to the tail. Color covering a range of tints from white to purple-blue and local changes of transparency simulating some variations in density. The effect should be very subtle though, no overkill. ...

Same trip to M31, looks good here too:



Yep, I have seen that a lot of parameters can be tweaked.
It seems there is some redundant code in there, am I wrong?

Hehe! You wrote "FT1.2"...
Does that mean ... hummm? Soooon?

New rendering with light blue-greyish tint with more transparency: http://jmmi.club.fr/celestia/c-2001.png For those interested in playing with the code, in render.ccp: lines 5785 { 5786 float shade = abs(viewDir * v.normal * v.brightness); 5787 glColor4f(0.2f, 0.2f, 0.3f, shade/1.5); 5788 glVertex(...

Yep, another light blue ionic tail, if possible at a small angle with the dust tail.
Should not be as proeminent as the existing one though.
Have to look at the code again

Well, I am a bit rusted on the math side but your great work demonstrates again that Celestia is not simply a toy but something really serious built on a real, rational, scientific approach.
Kudoos

Sure, with nothing in the background:

RGB values are 0.3 0.3 0.3 to get a light greyish tint.

Here it is!
Always wanted to get rid of the horrible blue color:

Made some changes in the rendering source code.

Thanks for liking it :D It took some time (a few hours) to figure out how bmp2pts analyses the input picture, what is really critical in the picture, what kind of algorithms it uses and then to understand what the Celestia engine is making out of the template file. Interesting. I am on a crash C++ c...

Hi all! I have made some changes in both Celestia source code and bmp2pts and re-compiled the whole stuff (Linux). I have added a new galaxy type "MW" for the Milky Way so that only the MW shows up with my new template (and not all SBcs as before). In bmp2pts, I have tweaked the brightness calculati...

This low fps figure clearly shows that you have no hardware rendering. With 3d acceleration enabled, you should get a figure in the thousands fps. Now, I am an nvidia guy so I can't help more, sorry. One thing I am sure of, though. The driver is not installed as it should be and your system is falli...

Hi andylong,
Your driver is not properly installed, or at least the 3d acceleration part.
Apparently, you have got stale Mesa libs in the way.
How does glxgears run, and how many fps are you getting?

Anyone willing to try the following? It's a simple resize of Powell's 'best guess' for the milky way. It'd probably either come out like the NASA one or just be a more-or-less blank disc, I know. But I'd be interested to see if there is a difference. http://philrsss.anu.edu.au/~carl/milkyway.png [/...

Hello t00fri, done! I am now looking at the source code of Bmp2pts. Many parameters can be adjusted right there in the internal data and formulas, like blob's brightness, effect of randomness, etc.. I am playing around also with threshold, and other stuff. As compilation takes only a fraction of a s...

OK, new try. Here is M100 again, thanks to tell me if it is bright enough now for your displays. Click the link below to see the screenshot. http://jmmi.club.fr/celestia/m100_4.png The template is there: http://jmmi.club.fr/celestia/SBc.pts Parameters: - threshold 0.5 - randomness 0.02 - 9780 points...

OK guys.
I will do some more tweaks tomorrow, normalize and re-work the thing.
I have to go back to social life right now

Really weird, indeed
It is very bright here, almost too much, exactly like the screenshot.

OK, new try:
http://jmmi.club.fr/celestia/m100_2.png

New template:
http://jmmi.club.fr/celestia/SBc.pts

Don't understand. It's pretty bright here

Cham wrote:Very NICE !

Boux, can you make this template available ?

But is this really a type SBc galaxy ?

Hi, thanks, you can grab the template from here (right click and save):
http://jmmi.club.fr/celestia/SBc.pts