add unity behavior package & examples

add behavior tree implementation

AI/Assets/Scripts/UnityBehaviorTree/FindPlayerControllerByRaycastAction.cs

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+using System;
+using DefaultNamespace;
+using DefaultNamespace.FSM;
+using Unity.Behavior;
+using UnityEngine;
+using Action = Unity.Behavior.Action;
+using Unity.Properties;
+
+[Serializable, GeneratePropertyBag]
+[NodeDescription(name: "Find Player Controller By Raycast", story: "Find [Target] by Raycast from [Agent]", category: "Action/Find", id: "e2b3bc47cdb71b5678009c1d431fc68b")]
+public partial class FindPlayerControllerByRaycastAction : Action
+{
+    [SerializeReference] public BlackboardVariable<GameObject> Target;
+    [SerializeReference] public BlackboardVariable<GameObject> Agent;
+    [SerializeReference] public BlackboardVariable<float> MaxDistance = new(100);
+
+    protected override Status OnStart()
+    {
+        // setup node
+        // Target.Value = null;
+        
+        // check initial values
+        if (Agent.Value == null) return Status.Failure;
+        
+        return Status.Running;
+    }
+
+    protected override Status OnUpdate()
+    {
+        if (Physics.Raycast(Agent.Value.transform.position, Agent.Value.transform.forward, out RaycastHit hit,
+                MaxDistance))
+        {
+            if (hit.transform.GetComponent<PlayerController>() != null)
+            {
+                Target.Value = hit.transform.gameObject;
+                return Status.Success;
+            }
+        }
+        
+        Target.Value = null;
+        return Status.Failure;
+    }
+
+    protected override void OnEnd()
+    {
+    }
+}
+

AI/Assets/Scripts/UnityBehaviorTree/FindPlayerControllerByRaycastAction.cs.meta

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+fileFormatVersion: 2
+guid: 6a08b2b3e631346b2b155982df199f9a

AI/Assets/Scripts/UnityBehaviorTree/GameObjectNullCondition.cs

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+using System;
+using Unity.Behavior;
+using UnityEngine;
+
+[Serializable, Unity.Properties.GeneratePropertyBag]
+[Condition(name: "GameObject is Null", story: "[Object] is [IsNull] null", category: "Variable Conditions", id: "9be617c0444353affee2f412e94ae715")]
+public partial class GameObjectNullCondition : Condition
+{
+    [SerializeReference] public BlackboardVariable<GameObject> Object;
+    [SerializeReference] public BlackboardVariable<bool> IsNull;
+
+    public override bool IsTrue()
+    {
+        return (Object.Value == null && IsNull) || (Object.Value != null && !IsNull);
+    }
+
+    public override void OnStart()
+    {
+    }
+
+    public override void OnEnd()
+    {
+    }
+}

AI/Assets/Scripts/UnityBehaviorTree/GameObjectNullCondition.cs.meta

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+fileFormatVersion: 2
+guid: 534847d817af848138303989d8adde9b