As for this red supergiant, seems a calm one, but you got the concept of the surface convections prtetty good, IMO. (A Betelgeuse type would just be too freaky for most, because of the supersized convection cells it's known to have, being one of the few exosolar stars whose surface is actually observed. Someone earlier had done one, but I think he lost his data.
I couldn't agree more about the supersized convection cells. I was somewhat at a loss to grasp the possibility of such large convection-type cells. I've seen numerous refined pictures and photos of Betelgeuse in differing stages of (for lack of a better description) convectional distortion.
It seem that most of the Astronomical community is jumping on the bandwagon with a few differing opinions on the actual number of cells believed to exist. Some are saying that these large individual cells themselves may possess many smaller sub-cells. This phenomenon of the number of convection cells and their size (specifically with respect to Betelgeuse) was predicted/ postulated by Martin Schwartzschild in a publication as far back as 1975.
Additionally, (and I'd have to recheck my references), I believe that I read several publications that alluded to certain conditions where Red Giants/ Supergiants evolve into Blue Giants/ Supergiants.
As far as creating a likened texture, the difficulties (for me anyway) seem to greatly outway the idea of even trying. As far as I know, Celestia will only render a circular ball-type star. Not one with irregular or non-proportional angles. I will certainly consider posting my version of the Blue Supergiant along with some other theoretical concepts I've been working on. Thanks for the response!
I renamed the original mstar.jpg to mstar2.jpg and put your Super Giant renamed to mstar.jpg in the med res folder and now the M star "reverted" to the G star texture.
Also,still not related,the same happened to the G stars.I put the 4k gstar.jpg in med res and renamed the original to gstar2.jpg,but the Sun still have the 2k gstar.jpg.
I tried it in the Celestia 1.3.2.
Gee, that's odd. What type of graphics card and OS are you running? These textures are pretty hefty files that may not load with older cards or integrated graphics.