shuttle impacts port (#37422)

* initial

* adjust densities and thruster hp

* Fix evil hack

* Last stuff

* review, cleanup

* admin RW

* minor cleanup

---------

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/CCVar/CCVars.Shuttle.cs

@@ -194,4 +194,92 @@ public sealed partial class CCVars
     /// </summary>
     public static readonly CVarDef<float> GridImpulseMultiplier =
         CVarDef.Create("shuttle.grid_impulse_multiplier", 0.01f, CVar.SERVERONLY);
+
+    #region impacts
+
+    /// <summary>
+    /// Whether shuttle impacts should do anything beyond produce a sound.
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<bool> ImpactEnabled =
+        CVarDef.Create("shuttle.impact.enabled", true, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Minimum impact inertia to trigger special shuttle impact behaviors when impacting slower than MinimumImpactVelocity.
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> MinimumImpactInertia =
+        CVarDef.Create("shuttle.impact.minimum_inertia", 5f * 50f, CVar.SERVERONLY); // 100tile grid (cargo shuttle) going at 5 m/s
+
+    /// <summary>
+    /// Minimum velocity difference between 2 bodies for a shuttle impact to be guaranteed to trigger any special behaviors like damage.
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> MinimumImpactVelocity =
+        CVarDef.Create("shuttle.impact.minimum_velocity", 15f, CVar.SERVERONLY); // needed so that random space debris can be rammed
+
+    /// <summary>
+    /// Multiplier of Kinetic energy required to dismantle a single tile in relation to its mass
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> TileBreakEnergyMultiplier =
+        CVarDef.Create("shuttle.impact.tile_break_energy", 3000f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Multiplier of damage done to entities on colliding areas
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactDamageMultiplier =
+        CVarDef.Create("shuttle.impact.damage_multiplier", 0.00005f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Multiplier of additional structural damage to do
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactStructuralDamage =
+        CVarDef.Create("shuttle.impact.structural_damage", 5f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Kinetic energy required to spawn sparks
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> SparkEnergy =
+        CVarDef.Create("shuttle.impact.spark_energy", 2000000f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Area to consider for impact calculations
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactRadius =
+        CVarDef.Create("shuttle.impact.radius", 4f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Affects slowdown on impact
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactSlowdown =
+        CVarDef.Create("shuttle.impact.slowdown", 0.8f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// Minimum velocity change from impact for special throw effects (e.g. stuns, beakers breaking) to occur
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactMinThrowVelocity =
+        CVarDef.Create("shuttle.impact.min_throw_velocity", 1f, CVar.SERVERONLY); // due to how it works this is about 16 m/s for cargo shuttle
+
+    /// <summary>
+    /// Affects how much damage reduction to give to grids with higher mass
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactMassBias =
+        CVarDef.Create("shuttle.impact.mass_bias", 0.65f, CVar.SERVERONLY);
+
+    /// <summary>
+    /// How much should total grid inertia affect our collision damage
+    /// </summary>
+    [CVarControl(AdminFlags.VarEdit)]
+    public static readonly CVarDef<float> ImpactInertiaScaling =
+        CVarDef.Create("shuttle.impact.inertia_scaling", 0.5f, CVar.SERVERONLY);
+
+    #endregion
 }

Content.Shared/Maps/ContentTileDefinition.cs

@@ -47,6 +47,12 @@ namespace Content.Shared.Maps
         [DataField]
         public PrototypeFlags<ToolQualityPrototype> DeconstructTools { get; set; } = new();
 
+        /// <summary>
+        /// Effective mass of this tile for grid impacts.
+        /// </summary>
+        [DataField]
+        public float Mass = 800f;
+
         /// <remarks>
         /// Legacy AF but nice to have.
         /// </remarks>