Minecraft-Console-Client/MinecraftClient/Physics/PhysicsConsts.cs
BruceChen 3efe63c54d feat: add pose system, slime block bounce, and crawling to physics engine
Implement the three Phase 0 prerequisites for the pathfinding rewrite:

- Pose system (vanilla Player.updatePlayerPose): dynamic AABB height based
  on current pose -- Standing (1.8), Sneaking (1.5), Swimming/Crawling (0.6).
  Automatically downgrades pose when headroom is insufficient (Standing ->
  Sneaking -> Swimming), matching vanilla 1.14+ forced-crawl behavior.

- Slime block bounce (vanilla SlimeBlock.bounceUp / stepOn): reverses
  downward velocity on landing, with sneaking suppression via
  isSuppressingBounce(). Also applies the horizontal slowdown effect
  from SlimeBlock.stepOn when walking on slime with low vertical velocity.

- Per-pose dimension constants in PhysicsConsts with eye heights for each
  pose, sourced from vanilla Avatar.POSES (26.1 decompiled).

- Debug logging for pose transitions, slime bounces, and periodic physics
  state dumps routed through McClient's ILogger.

Tested on a real 1.21.11 server: crawling triggers correctly under 1-block
ceilings, sneaking under 1.5-block ceilings, slime bounce produces correct
decaying oscillation, and pose recovery works when obstacles are removed.

Made-with: Cursor
2026-04-12 18:43:32 +00:00

96 lines
3.8 KiB
C#

using System;
namespace MinecraftClient.Physics
{
/// <summary>
/// All physics constants matching vanilla Minecraft 1.21.11.
/// Values sourced from Entity.java, LivingEntity.java, Player.java, LocalPlayer.java.
/// </summary>
public static class PhysicsConsts
{
// --- Player dimensions per pose (vanilla Avatar.POSES, 26.1) ---
public const double PlayerWidth = 0.6;
public const double PlayerStandingHeight = 1.8;
public const double PlayerStandingEyeHeight = 1.62;
public const double PlayerCrouchingHeight = 1.5;
public const double PlayerCrouchingEyeHeight = 1.27;
public const double PlayerSwimmingHeight = 0.6;
public const double PlayerSwimmingEyeHeight = 0.4;
[Obsolete("Use PlayerStandingHeight instead")]
public const double PlayerHeight = PlayerStandingHeight;
[Obsolete("Use PlayerStandingEyeHeight instead")]
public const double PlayerEyeHeight = PlayerStandingEyeHeight;
// --- Gravity ---
public const double DefaultGravity = 0.08;
public const double SlowFallingCap = 0.01;
// --- Step height ---
public const float StepHeight = 0.6f;
// --- Friction / drag ---
public const float FrictionMultiplier = 0.91f;
public const float DragY = 0.98f;
public const float InputFriction = 0.98f;
public const float GroundAccelerationFactor = 0.21600002f; // 0.216 / (f^3)
public const float AirAcceleration = 0.02f;
// --- Default block friction ---
public const float DefaultBlockFriction = 0.6f;
public const float IceFriction = 0.98f;
public const float PackedIceFriction = 0.98f;
public const float BlueIceFriction = 0.989f;
public const float SlimeBlockFriction = 0.8f;
// --- Speed factors ---
public const float DefaultSpeedFactor = 1.0f;
public const float SoulSandSpeedFactor = 0.4f;
public const float HoneySpeedFactor = 0.4f;
// --- Water ---
public const float WaterSlowDown = 0.8f;
public const float WaterSprintSlowDown = 0.9f;
public const float DolphinsGraceSlowDown = 0.96f;
public const float WaterBaseSpeed = 0.02f;
public const float WaterYDamping = 0.8f;
public const float WaterFloatImpulse = 0.04f;
// --- Lava ---
public const float LavaSpeed = 0.02f;
public const double LavaHorizontalDamping = 0.5;
public const double LavaVerticalDamping = 0.8;
// --- Jump ---
public const float BaseJumpPower = 0.42f;
public const double SprintJumpHorizontalBoost = 0.2;
// --- Climb ---
public const float ClimbMaxSpeed = 0.15f;
public const double ClimbWallBump = 0.2;
// --- Velocity zeroing thresholds (from LivingEntity.aiStep) ---
public const double PlayerHorizontalVelocityThresholdSqr = 9.0E-6; // < 0.003 length
public const double NonPlayerVelocityThreshold = 0.003;
public const double VerticalVelocityThreshold = 0.003;
// --- Collision epsilon ---
public const double CollisionEpsilon = 1.0E-7;
// --- Position packet sending (from LocalPlayer.sendPosition) ---
public const double PositionSendThresholdSqr = 4.0E-8; // (2e-4)^2
public const int PositionReminderInterval = 20;
// --- Flying detection ---
public const double FloatingYThreshold = -0.03125;
// --- Elytra ---
public const double ElytraXZDrag = 0.99;
public const double ElytraYDrag = 0.98;
// --- Creative/spectator fly ---
public const float DefaultFlySpeed = 0.05f;
public const double FlyVerticalDamping = 0.6;
public const double FlyVerticalBoostScale = 3.0;
}
}