YS FLIGHT SIMULATOR Untested Version for Debugging Purpose


You can download test-version YSFLIGHT and Scenery Editor.  Since these files are test version, these haven't gone through pre-release test which I run before releasing an official version.  If you would like to use a stable official version, please download YSFLIGHT from here.

By the way, I really truly absolutely didn't run pre-release test at all for this test version at this time.  Usually I pick a few test items and try them before rolling out a test version, but this time I haven't.  All I did was I took off and made one traffic pattern with F-18E.  I suppose you will see a lot of bugs in this test version.  I appreciate your report so that I can fix them.

When you report me a problem, please describe the situation as much detailed as possible.  Please include at least in what operating system you are running the program, and in Windows which executable you are using, and if the problem is specific to a particular airplane or scenery, please include them.  If a problem is associated with a specific add-on, please let me know where I can download it from as well.

Thank you for your help!

for Windows

[YSFLIGHT] (2017/05/17)

[Scenery Editor] (2015/02/02)

for Intel Mac OSX

[YSFLIGHT] (2017/05/17) (Including YSFLIGHT for Linux)

[Scenery Editor] (2015/02/02)

for Linux 32-bit & 64-bit (Tested on Ubuntu 14 on Parallels Desktop)

[Scenery Editor] (2015/02/02)

Concept Mission

[AomoriWars.yfs] (2014/10/29)

Sound DLL Sample Source Files

[Sound DLL Source] (2012/02/19)

Voice DLL Source File Skeleton

[Voice DLL Skeleton Source] (2012/02/25)


[Practice IFR Appoach in YSFLIGHT (Draft)]




  • Config: Draw runway lights during the day "only if the visibility is less than XX miles"
  • Draws flare and black smoke with particles.
  • Draws clouds with particles in YSFLIGHT on OpenGL 1.x and Direct X9
  • Vary point size for aircraft lights depend on the window size (it was fixed 3 pixels.)
  • I forgot copying sound DLLs for Linux.  Now it is in.
  • Sorry, I haven't been able to address all the bug reporst.  I'll try to get them done in the next update.


  • Sorry, Shadow-Map was off in the package I uploaded yesterday.  It takes too much time for pre-releaste test.  So, I have been trying to automate some of them.  In the process, I accidentally disabled the shadow map.  The new package re-enables the shadow map.


  • Console Server for macOS
  • Maps are now drawn with depth-test turned on.  I think elevated maps are drawn correctly.


  • Multi-Language Input.  Except Linux.
  • Calculate transformation matrices in CPU in double precision.  This substantially reduces the shaking effect when the view point is far away from the origin without much performance penalty.  By the way, in early days, a major misunderstanding was that the matrix calculation was taking much of the computation in graphics.  It was wrong.  Z-Buffering was the major headache around 1990 to 2000.
  • YSFLIGHT on OpenGL 2.x uses shadow-mapping to draw shadow.  Now aircrafts and ground objects cast shadow nicely.  By the way, in the process of implementing, I have tried Cascaded Shadow Map, which turned out to be utterly useless.  Most of, probably more than 99%, of the recent graphics techniques cannot be used in the scene which covers 20 miles square.  I ended up coming up with my ad-hoc shadow-volume calculation, which I think worked out well.
  •  Start-Position search box in the new-flight dialog.

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