Added VRMFirstPersonEditor #66

Scripts/FirstPerson/Editor/VRMFirstPersonEditor.cs

@@ -0,0 +1,28 @@
+using UnityEditor;
+
+
+namespace VRM
+{
+    [CustomEditor(typeof(VRMFirstPerson))]
+    class VRMFirstPersonEditor : Editor
+    {
+        void OnSceneGUI()
+        {
+            var component = target as VRMFirstPerson;
+
+            var head = component.FirstPersonBone;
+            if (head == null)
+            {
+                return;
+            }
+
+
+            var worldOffset = head.localToWorldMatrix.MultiplyPoint(component.FirstPersonOffset);
+            worldOffset = Handles.PositionHandle(worldOffset, head.rotation);
+
+            Handles.Label(worldOffset, "FirstPersonOffset");
+
+            component.FirstPersonOffset = head.worldToLocalMatrix.MultiplyPoint(worldOffset);
+        }
+    }
+}