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FlyInHeightASL broken - AI still copies ground elevation
Reviewed, NormalPublic


When using FlyInHeightASL the AI pilots will still copy the ground elevation,
even when using values like [600,600,600], they are still trying to avoid terrain, as if they were following terrain.


Operating System
Windows 7
Steps To Reproduce

Place plane mid air,
this FlyInHeight [600,600,600] in init field,
watch how it still follows the terrain.

Event Timeline

Still broken.

Case in point: a script I'm working on that spawns in and AI-piloted armed Blackfish VTOL with a loiter waypoint...

According to the BI Wiki entry given values for both flyInHeight and flyInHeightASL it should travel at max(flyInHeight, flyInHeightASL). Thus with...

_plane flyInHeight 100;
_plane flyInHeightASL [1000, 1000, 1000];

...over rough terrain like Tanoa's main island I'm expecting level flight at 1000 m ASL so long as the terrain elevation doesn't exceed 900 m ASL. What actually happens however is the Blackfish follows terrain at approx. 100m altitude, ignoring the flyInHeightASL command completely.

Wulf added a subscriber: Wulf.Apr 24 2018, 12:41 PM

@dmorchard if you remove _plane flyInHeight 100; it will work.

Hi @Wulf!

Respectfully, it doesn't. I've tested my script without the flyInHeight line and it still completely ignores the flyInHeightASL command. The result of...

_plane flyInHeightASL [1000, 1000, 1000]; terrain-following flight at around 100 m altitude, which I believe is the default flying height.

I want to point out that the loiter waypoint is also involved so what I'm experiencing is comparable to what FrostyKush reported here.

Wulf added a comment.Apr 24 2018, 5:43 PM

Hmm. Could you please upload your mission here so that we might have a look at it?

Thank you.

Gladly! But before I do that, the script I'm working on is currently in the form of a mod. Is it alright if I upload separate PBOs for the mission and the mod along with repro steps, or would you rather I try to integrate my script into the mission?

Understandably, you guys probably don't want to get into the practice of troubleshooting peoples' mods for them, right? ;)


I've incorporated the script from my mod into the mission...

...and also uploaded the SQF for your convenience...

Repro steps:

  1. In debug console... execVM "blackfishCAS.sqf";
  2. Watch the Blackfish settle into a loiter with 500m radius, skimming the water and dodging the hills at ~100m rather than ignoring terrain at a constant 1000m ASL.

Thanks for looking into this for us!

Wulf changed the task status from New to Reviewed.Apr 27 2018, 10:12 AM

After some testing. Seems that the loiter waypoint is causing this issue, we will have a look at it.