Added Behavior Graph asset for AI simulations

AI/Assets/Scripts/UnityBehaviors/FindByRaycastAction.cs

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+using System;
+using DefaultNamespace;
+using Unity.Behavior;
+using UnityEngine;
+using Action = Unity.Behavior.Action;
+using Unity.Properties;
+
+[Serializable, GeneratePropertyBag]
+[NodeDescription(name: "Find by Raycast", story: "Find [Target] by raycast from [Agent]", category: "Action/Find", id: "cde581f97d96148705ed557e6d9ef0c0")]
+public partial class FindByRaycastAction : Action
+{
+    [SerializeReference] public BlackboardVariable<GameObject> Target;
+    [SerializeReference] public BlackboardVariable<GameObject> Agent;
+    [SerializeReference] public BlackboardVariable<float> MaxDistance = new(10.0f);
+
+    protected override Status OnStart()
+    {
+        // initialize the node
+        
+        // check variables first
+        if (Agent.Value == null) return Status.Failure;
+        
+        return Status.Running;
+    }
+
+    protected override Status OnUpdate()
+    {
+        // will be called every frame while the node is running
+        Target.Value = null;
+        
+        RaycastHit hit;
+        if (!Physics.Raycast(Agent.Value.transform.position, Agent.Value.transform.forward, out hit, MaxDistance)) return Status.Failure;
+        
+        PlayerController playerController = hit.collider.GetComponent<PlayerController>();
+        if (!playerController) return Status.Failure;
+        
+        Target.Value = playerController.gameObject;
+        return Status.Success;
+    }
+
+    protected override void OnEnd()
+    {
+        // deinitialize the node
+    }
+}
+

AI/Assets/Scripts/UnityBehaviors/FindByRaycastAction.cs.meta

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+fileFormatVersion: 2
+guid: 050a9dc7e793c41e8b67a8485bdc6755

AI/Assets/Scripts/UnityBehaviors/GameObjectNullCondition.cs

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+using System;
+using Unity.Behavior;
+using UnityEngine;
+
+[Serializable, Unity.Properties.GeneratePropertyBag]
+[Condition(name: "GameObject Null", story: "[Target] [is] null", category: "Conditions", id: "6bc7c2e1cf9d2d4a14b5c3ac1b47da1d")]
+public partial class GameObjectNullCondition : Condition
+{
+    [SerializeReference] public BlackboardVariable<GameObject> Target;
+    [Comparison(comparisonType: ComparisonType.Boolean)]
+    [SerializeReference] public BlackboardVariable<ConditionOperator> Is;
+
+    public override bool IsTrue()
+    {
+        if (Target.Value == null && Is.Value == ConditionOperator.Equal) return true;
+        if (Target.Value != null && Is.Value == ConditionOperator.NotEqual) return true;
+        return false;
+    }
+
+    public override void OnStart()
+    {
+    }
+
+    public override void OnEnd()
+    {
+    }
+}

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

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 2de8640b1b5a34a6aa6e88a233a1f2dc