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Stellarium / stellarium

Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and macOS. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
https://stellarium.org
GNU General Public License v2.0
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Surveys: diagonal stripe at specific scale #1514

Open axd1967 opened 3 years ago

axd1967 commented 3 years ago

Expected Behaviour

Actual Behaviour

Describe or maybe attach a screenshot?

Zoom in: observe the diagonal stripe through M42 image

Zoom out: Diagonal gone

Steps to reproduce

  1. make sure no survey is active
  2. select M42
  3. zoom to FOV around 1 deg (CTL-ALT-9)
  4. in Surveys, select "AKARI FIS color WideL"
  5. observe diagonal stripe (see sshot above)
  6. zoom out to FOV 10 deg (CTL-ALT-6)
  7. observe the stripe is filled normally
  8. as from now, zooming in (eg CTL-ALT-9) no longer shows this artifact

System

Logfile

If possible, attach the logfile log.txt from your user data directory. Look into the Guide for its location. log.txt

axd1967 commented 3 years ago

Independent of the chosen Survey - happens with other surveys too sur

alex-w commented 3 years ago

Alex, did you compare visualization of HiPS with Aladin for example?

axd1967 commented 3 years ago

I tried a few surveys with the online version (probably not good enough, I should try the desktop app):

image

image

image

It looks like maybe there is a small bug in Stellarium on handling the sides of what probably are tiles. The "stripes" are aligned to an internal coordinate system.

When I switch between az/eq mode, the display follows:

image

(look for the faint green az/eq indication in the center of the shot)

image

image

guillaumechereau commented 3 years ago

The black and red lines seem to be from the original survey, but there is also clearly a rendering bug, probable in the mesh generation of the HiPS during rendering. I cannot reproduce it on my machine though. It might be something that happens while the survey is still loading, or maybe only with some specific screen resolution / density.

guillaumechereau commented 3 years ago

@axd1967: are you using the default Stereographic projection ?

axd1967 commented 3 years ago

The black lines are not an issue, those are clearly data artifacts. But the transparent band draws the attention, even if the workaround is to zoom out, then in.

I am using stereo, yes; but it also happens in perspective.

If you feel for proposing a patch, I can compile it and post the logs/results.