Open alex-w opened 5 years ago
Our built-in Pan has an orbital inclination of almost 1/2 degree, probably more than the correct value, but I don't know where the data are coming from.
The graphics issue seems to be a problem with projections. Using Perspective Projection it looks good (at least after adding a mimimum z_near in Planet::draw3dModel()), with others near triangles break apart. It does not help to tessellate the rings into a finer mesh.
Original report by Pierluigi Panunzi: https://bugs.launchpad.net/stellarium/+bug/1559657
Hi! I'm working with Saturn and it's famous rings... I have created a data packet for its satellite PAN, whose orbit lies inside Enke's Division. Collecting data from wikipedia, I organized the relevant data for Pan :
practically organizing data as other satellites with "ell_orbit" coord_func value: I started from Jupiter's Adrastea and modified values accordingly. Please note the null values for "orbit_Inclination" and "rot_obliquity". Now insert these data in ssystem.ini file and follow my instructions! You can witness a really awesome sight!
choose Pan as Location (F6) and set coordinates to +40°00'00", +100°00'00", in order to see a magnificent view of Saturn
with the mouse move horizontally a little in order to see rings edge-on
choose a FOV of about 80°, just to see a smaller Saturn... Awesome view!!!
press 3 times the L key, in order to increase the speed of time: you can see the magnificent show of Saturn crossed by the rings' shadows, but you can see also that there's something strange and wrong with the rings, that "flash" cyclically at that rate...
If you return to the normal speed of time (K) then you can see that rings are not always edge-on as you can expect: please remember that both inclinations are put to streight 0.0
What is wrong with my Pan's setup? Or is there any kind of issue in the "ell_orbit" algorithm?
If you try the same, starting now from Enceladus (for which we have "coord_func=enceladus_special") you can see that rings remain always edge-on without any wobbling. then if you further zoom towards Saturn (I suggest you, in full screen view!) you can see also Pan wandering along the edge-on rings, as you would expect. Mimas instead has an orbital inclination of only 1.57°, but that's enough to see it detached from the rings' line. (as in the attached screenshot)
Thanks for your attention! Pierluigi Panunzi
My log.txt file is this. BTW what about the series of messages "libpng warning: iCCP: known incorrect sRGB profile"? I have never seen them...