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fix(*): jitter kickoff resets to break deterministic same-model mirror matches

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GameMode.reset_ball()/reset_ships() teleported to exact, identical spawn
transforms every kickoff. Combined with deterministic bot inference
(action_noise = 0 by default), two ships running the same policy from a
mirror-symmetric state produced mirrored, non-diverging play instead of a
real contest — most visible when both sides use the same exported model.

Adds a small position/yaw jitter (well under anything a player would
notice as "not a real kickoff") so kickoff-style resets stop being
bit-for-bit identical.
This commit is contained in:
Josh Creek
2026-07-22 18:01:21 +01:00
parent fca6a46200
commit 0e42182cce
1 changed files with 23 additions and 2 deletions
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Game/scripts/game_mode.gd
+23 -2
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@@ -85,15 +85,36 @@ func spawn_camera_rig(target: Ship) -> ShipCameraRig:
return rig
# Tiny per-reset randomization, well below anything a player would notice as
# "not a real kickoff" — just enough that two ships running the identical
# deterministic AI policy (action_noise = 0) don't start every kickoff from a
# bit-for-bit mirror-symmetric state. A perfectly symmetric state feeds both
# controllers identical (canonicalized) observations, so they emit mirrored
# actions and can lock into a repetitive, non-scoring stalemate — much more
# visible bot-vs-bot (same model both sides) than bot-vs-human, since a human
# never satisfies "identical policy" in the first place. See training_mode.gd's
# _end_eval_episode, which randomizes eval episode states for the same reason.
const KICKOFF_POSITION_JITTER := 0.3
const KICKOFF_YAW_JITTER := deg_to_rad(15.0)
func reset_ball() -> void:
if is_instance_valid(ball):
_reset_body(ball, arena.get_ball_spawn())
_reset_body(ball, _jittered(arena.get_ball_spawn(), KICKOFF_POSITION_JITTER, 0.0))
func reset_ships() -> void:
for ship in ships:
if is_instance_valid(ship):
_reset_body(ship, _ship_spawn_transforms[ship])
_reset_body(ship, _jittered(_ship_spawn_transforms[ship], KICKOFF_POSITION_JITTER, KICKOFF_YAW_JITTER))
func _jittered(to: Transform3D, position_jitter: float, yaw_jitter: float) -> Transform3D:
var offset := Vector3(randf_range(-position_jitter, position_jitter), 0.0, randf_range(-position_jitter, position_jitter))
var basis := to.basis
if yaw_jitter > 0.0:
basis = basis.rotated(Vector3.UP, randf_range(-yaw_jitter, yaw_jitter))
return Transform3D(basis, to.origin + offset)
func _reset_body(body: RigidBody3D, to: Transform3D) -> void: