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Impose minimum altitude for mid-mission spawns.

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We had this for the old style in-flight spawns, but not for mid-mission
spawns. Aircraft that were spawning soon after takeoff could potentially
be close to (or under) the ground, causing them to "crash" at game
start. The altitude is different here than for the old style in-flight
spawns to try to get closer to the intended spawn location.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1941
This commit is contained in:
Dan Albert 2022-01-24 17:36:15 -08:00
parent 2499276b2a
commit e80851b0a1
1 changed files with 17 additions and 1 deletions
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18
game/missiongenerator/aircraft/flightgroupspawner.py
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@ -15,13 +15,22 @@ from game.ato import Flight
from game.ato.flightstate import InFlight
from game.ato.starttype import StartType
from game.theater import Airfield, ControlPoint, Fob, NavalControlPoint, OffMapSpawn
from game.utils import meters
from game.utils import feet, meters
from gen.flights.traveltime import GroundSpeed
from gen.naming import namegen
WARM_START_HELI_ALT = meters(500)
WARM_START_ALTITUDE = meters(3000)
# In-flight spawns are MSL for the first waypoint (this can maybe be changed to AGL, but
# AGL waypoints have different piloting behavior, so we need to check whether that's
# safe to do first), so spawn them high enough that they're unlikely to be near (or
# under) the ground, or any nearby obstacles. The highest airfield in DCS is Kerman in
# PG at 5700ft. This could still be too low if there are tall obstacles near the
# airfield, but the lowest we can push this the better to avoid spawning helicopters
# well above the altitude for WP1.
MINIMUM_MID_MISSION_SPAWN_ALTITUDE = feet(6000)
RTB_ALTITUDE = meters(800)
RTB_DISTANCE = 5000
HELI_ALT = 500
@ -131,6 +140,13 @@ class FlightGroupSpawner:
pos = self.flight.state.estimate_position()
pos += Point(random.randint(100, 1000), random.randint(100, 1000))
alt, alt_type = self.flight.state.estimate_altitude()
# We don't know where the ground is, so just make sure that any aircraft
# spawning at an MSL altitude is spawned at some minimum altitude.
# https://github.com/dcs-liberation/dcs_liberation/issues/1941
if alt_type == "BARO" and alt < MINIMUM_MID_MISSION_SPAWN_ALTITUDE:
alt = MINIMUM_MID_MISSION_SPAWN_ALTITUDE
group = self.mission.flight_group(
country=self.country,
name=name,