add LookAtTargetSwitcher

Scripts/LookAt/LookAtTargetSwitcher.cs

@@ -0,0 +1,78 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+
+namespace VRM
+{
+    public class LookAtTargetSwitcher : MonoBehaviour
+    {
+        [SerializeField]
+        List<Transform> m_targets = new List<Transform>();
+
+        [SerializeField, Range(0, 90.0f)]
+        float m_thresholdDegrees = 60.0f;
+
+        [SerializeField]
+        VRMLookAtHead m_lookAtHead;
+
+        [SerializeField]
+        Blinker m_blinker;
+
+        private void Reset()
+        {
+            m_lookAtHead = GameObject.FindObjectOfType<VRMLookAtHead>();
+            m_blinker = GameObject.FindObjectOfType<Blinker>();
+        }
+
+        float CalcScore(Transform target)
+        {
+            return Vector3.Dot(m_lookAtHead.Head.WorldForward, target.position - m_lookAtHead.Head.Transform.position);
+        }
+
+        Transform ChooseTarget()
+        {
+            Transform target = null;
+            float maxScore = 0;
+            var min = System.Math.Cos(m_thresholdDegrees * Mathf.Deg2Rad);
+            foreach (var x in m_targets)
+            {
+                var score = CalcScore(x);
+                if (score > min && score > maxScore)
+                {
+                    maxScore = score;
+                    target = x;
+                }
+            }
+            return target;
+        }
+
+        Transform m_lastTarget;
+
+        private void Update()
+        {
+            if (m_targets == null || m_targets.Count == 0) return;
+
+            var target = ChooseTarget();
+            if (target != m_lastTarget)
+            {
+                // blink
+                //Debug.Log("request");
+                m_lastTarget = target;
+                m_blinker.Request = true;
+            }
+
+            Vector3 targetPosition;
+            if (target == null)
+            {
+                // forward
+                targetPosition = m_lookAtHead.Head.Transform.position + m_lookAtHead.Head.WorldForward * 20.0f;
+            }
+            else
+            {
+                targetPosition = target.position;
+            }
+            // half move
+            transform.position += (targetPosition - transform.position) * 0.5f;
+        }
+    }
+}