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fix(app+core): Phase B.3 — streaming follows player, AC jump physics

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Three fixes for user-reported movement bugs:

1. Character disappears far from spawn: streaming observer now computed
   from _playerController.Position when player mode is active, instead
   of _lastLivePlayerLandblockId which only updates from server echoes
   (never for autonomous moves). The 5x5 streaming window now follows
   the player as they walk.

2. Jump physics from ACE: JumpImpulse=5.0 and GravityAccel=9.8
   matching AC's formula: velocity_z = sqrt(height * 19.6) where
   height = BurdenMod * (JumpSkill / (JumpSkill + 1300) * 22.2 + 0.05)
   For a new char (skill=100, burden=50%): height≈1.31, vz≈5.07.

3. Gravity reduced from 20 to 9.8 (AC's F_GRAVITY constant).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-12 21:06:42 +02:00
parent 192e066182
commit 6f05c298cf
2 changed files with 21 additions and 4 deletions
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10
src/AcDream.App/Input/PlayerMovementController.cs
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@ -64,8 +64,14 @@ public sealed class PlayerMovementController
public float VerticalVelocity { get; private set; }
public bool IsAirborne { get; private set; }
public float JumpImpulse { get; set; } = 3.5f; // placeholder; retail scales by Jump skill
public float GravityAccel { get; set; } = 20f;
/// <summary>
/// Jump velocity Z. AC formula: sqrt(height * 19.6) where
/// height = BurdenMod * (JumpSkill / (JumpSkill + 1300) * 22.2 + 0.05) * power.
/// For a typical new char (skill=100, burden=50%, power=1.0) ≈ 5.07.
/// </summary>
public float JumpImpulse { get; set; } = 5.0f;
/// <summary>AC's gravity constant (F_GRAVITY = 9.8 m/s²).</summary>
public float GravityAccel { get; set; } = 9.8f;
public float AirControlFactor { get; set; } = 0.2f;
/// <summary>