NPC steering tweaks (#17911)

- Slightly less twitchy in melee.
- Resteer less.
- More aggressive in pursuing running away targets.

Content.Server/NPC/Components/NPCSteeringComponent.cs

@@ -48,7 +48,7 @@ public sealed class NPCSteeringComponent : Component
     [DataField("lastSteerDirection")]
     public Vector2 LastSteerDirection = Vector2.Zero;
 
-    public const int SteeringFrequency = 10;
+    public const int SteeringFrequency = 5;
 
     /// <summary>
     /// Last position we considered for being stuck.

Content.Server/NPC/Systems/NPCCombatSystem.Melee.cs

@@ -28,16 +28,30 @@ public sealed partial class NPCCombatSystem
         if (TryComp<MeleeWeaponComponent>(component.Weapon, out var weapon))
         {
             var cdRemaining = weapon.NextAttack - _timing.CurTime;
+            var attackCooldown = TimeSpan.FromSeconds(1f / _melee.GetAttackRate(component.Weapon, uid, weapon));
 
-            // If CD remaining then backup.
+            // Might as well get in range.
-            if (cdRemaining < TimeSpan.FromSeconds(1f / _melee.GetAttackRate(component.Weapon, uid, weapon)) * 0.5f)
+            if (cdRemaining < attackCooldown * 0.45f)
                 return;
 
             if (!_physics.TryGetNearestPoints(uid, component.Target, out var pointA, out var pointB))
                 return;
 
-            var idealDistance = weapon.Range * 1.5f;
             var obstacleDirection = pointB - args.WorldPosition;
+
+            // If they're moving away then pursue anyway.
+            // If just hit then always back up a bit.
+            if (cdRemaining < attackCooldown * 0.90f &&
+                TryComp<PhysicsComponent>(component.Target, out var targetPhysics) &&
+                Vector2.Dot(targetPhysics.LinearVelocity, obstacleDirection) > 0f)
+            {
+                return;
+            }
+
+            if (cdRemaining < TimeSpan.FromSeconds(1f / _melee.GetAttackRate(component.Weapon, uid, weapon)) * 0.45f)
+                return;
+
+            var idealDistance = weapon.Range * 4f;
             var obstacleDistance = obstacleDirection.Length();
 
             if (obstacleDistance > idealDistance || obstacleDistance == 0f)

Content.Server/NPC/Systems/NPCSteeringSystem.Context.cs

@@ -382,7 +382,7 @@ public sealed partial class NPCSteeringSystem
         TransformComponent xform,
         float[] danger)
     {
-        var objectRadius = 0.15f;
+        var objectRadius = 0.10f;
         var detectionRadius = MathF.Max(0.35f, agentRadius + objectRadius);
 
         foreach (var ent in _lookup.GetEntitiesInRange(uid, detectionRadius, LookupFlags.Static))