0e9b10c3ae
845f6c3aa (aetheria-gravity:ruling:no-drag-below-top-speed) removed hull drag below a hull's top speed. The crosser was staged at the Djinni's 50 m/s cap on the premise that drag slowed it to ~25 m/s at the bow line; it now holds 50 m/s and crosses at 2.57 s, 50 m/s relative, 1.1 rad/s, outside the tuned encounter (3.6 s, 25 m/s, 0.56 rad/s) that the Brief, the pass window and CrossingHoldsAcrossTheStartWindow all describe. CrossingConditions and CrossingHoldsAcrossTheStartWindow failed on that stale tuning, not on a defect.
The encounter is restaged to reproduce its tuning under the ruled physics: launched at 25 m/s from 90 m out (probed over speed x start; constant-speed passes are dx / v seconds, 45 m ahead). The pass lands at 3.63 s, 44.7 m, 24.9 m/s relative, 0.56 rad/s. The test's launch-speed assertions now pin the scenario's 25 m/s instead of "most of the cap"; the time, distance, relative-speed and angular-rate windows are unchanged. If drag below top speed returns, the crosser decays and the pass leaves the window.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
60 lines
4.3 KiB
C#
60 lines
4.3 KiB
C#
using static CultMath.math;
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using static ItemRotation;
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public sealed class Crossing : Scenario
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{
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public override string Name => "Crossing";
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public override string Id => "crossing";
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public override string Brief => "A Lightning Projector at the starboard gun and a Cell Blaster at the port gun, an unpiloted Djinni coasting across the bow " +
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"close ahead and an unpiloted one waiting at range. The crosser is launched to port at 25 m/s and only coasts: nothing steers it, " +
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"a hull coasts at its launch speed below its top speed, and it does not shoot back. Make the pass coasting: give no throttle until the Djinni has crossed the bow, then fly freely " +
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"(thrusting from the start carries you past it). Verify: as the Djinni crosses close, FastBlast lands some and projector " +
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"almost none; against the Djinni at range both land. Fly it again without the Fire Control Array: " +
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"with it the small gun lands more.";
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public override uint Seed => 112;
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public override bool Ambient => false;
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// Where the Djinni sit: the player is at Origin facing +z. Origin is 250 m or more from every body, where the zone's
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// pull is weakest (about 1.4 u/s^2; the sum of the wells never drops to nothing, and at the old origin the player sat on the star).
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// The crosser is unpiloted and placed moving at 25 m/s, well under the Djinni's 50 m/s top speed, so its pass is ballistic: a hull
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// coasts below its top speed (aetheria-gravity:ruling:no-drag-below-top-speed) and only the field bends it, so it reaches the
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// bow line at 25 m/s relative to the player, 3.6 s in, and nothing steers it. (Launched at the cap with drag slowing it to 25 m/s,
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// as this scenario was first tuned, it would now hold 50 m/s and cross in 2.6 s.)
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// CrosserAt is the centre of the start window in which the pass holds: shifting it by 10 m along either axis keeps the pass
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// inside the test's time and distance windows (CrossingHoldsAcrossTheStartWindow).
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// The waiting Djinni sits inside the Lightning Projector's arc at 80% of its Range.
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public static readonly CultMath.float2 Origin = float2(724, 124);
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public static readonly CultMath.float2 CrosserAt = Origin + float2(-90, 45), CrosserFacing = float2(1, 0), CrosserVelocity = float2(25, 0);
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// The fighter is staged at this quality, so its gear and the range below do not ride the item stream.
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public const float StagedQuality = .6f;
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// The Lightning Projector's Range in metres at the staged fit: 996.99 after the three seconds the test settles for
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// (EvSettle); it falls toward 864 m as the projector heats. The fit as it stood at 0f5def17 (unstaged, its draws on the
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// item stream) measured 1216.4.
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public const float ProjectorRange = 997f;
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public static readonly CultMath.float2 Waiting = Origin + float2(0, ProjectorRange * .8f);
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public override Galaxy Generate(GalaxyStage stage) => stage.Prelude(DemoTerminus.Cast);
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public override void Stage(ScenarioStage stage)
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{
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var fighter = stage.Fit("Longinus", StagedQuality,
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("Cockpit 2x2", int2(2, 6), None),
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("Large Drive", int2(1, 0), Reversed),
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("Large Drive", int2(3, 0), Reversed),
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("Rugged Drive", int2(2, 14), CounterClockwise),
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("Rugged Drive", int2(3, 14), Clockwise),
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("Compact Reactor", int2(2, 4), None),
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("GT 3K", int2(0, 5), None), // Guided Missile Launcher
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("GT 3K", int2(5, 5), None), // Guided Missile Launcher
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("DragOnBreath", int2(1, 8), None), // Lightning Projector
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("FastBlast+-", int2(4, 8), None), // Cell Blaster
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("Radiator", int2(2, 2), CounterClockwise),
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("Radiator", int2(3, 2), Clockwise),
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("not if i see you first", int2(3, 10), None), // Compact Sensor
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("Panopticon Prime", int2(1, 6), Clockwise)); // Fire Control Array
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stage.Player(fighter, Origin, facing: float2(0, 1));
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stage.Place(stage.Generated("Djinni"), CrosserAt, facing: CrosserFacing, stance: ScenarioStance.Hostile, velocity: CrosserVelocity);
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stage.Place(stage.Bare("Djinni"), Waiting);
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}
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}
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