added MouseWorldPositionWindow for displaying world position under cursor in Scene View

Assets/Scripts/Editor/MouseWorldPositionWindow.cs

@@ -0,0 +1,132 @@
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEngine;
+
+public class MouseWorldPositionWindow : EditorWindow
+{
+    private enum PlaneMode { XY, XZ, YZ, CameraFacing }
+
+    private PlaneMode planeMode = PlaneMode.XZ;
+    private float planeOffset = 0f; // смещение плоскости по нормали (Z для XY, Y для XZ, X для YZ)
+    private bool lockToSceneView = true;
+    private int decimals = 3;
+
+    private Vector3 lastWorld;
+    private bool hasPoint;
+
+    [MenuItem("Tools/Mouse World Position")]
+    public static void Open()
+    {
+        GetWindow<MouseWorldPositionWindow>("Mouse World Pos");
+    }
+
+    private void OnEnable()
+    {
+        SceneView.duringSceneGui += OnSceneGUI;
+    }
+
+    private void OnDisable()
+    {
+        SceneView.duringSceneGui -= OnSceneGUI;
+    }
+
+    private void OnGUI()
+    {
+        EditorGUILayout.LabelField("Source", EditorStyles.boldLabel);
+        lockToSceneView = EditorGUILayout.ToggleLeft("Use last active Scene View", lockToSceneView);
+
+        EditorGUILayout.Space(6);
+        EditorGUILayout.LabelField("Projection", EditorStyles.boldLabel);
+
+        planeMode = (PlaneMode)EditorGUILayout.EnumPopup("Plane", planeMode);
+        if (planeMode != PlaneMode.CameraFacing)
+            planeOffset = EditorGUILayout.FloatField("Plane Offset", planeOffset);
+
+        decimals = EditorGUILayout.IntSlider("Decimals", decimals, 0, 6);
+
+        EditorGUILayout.Space(10);
+        EditorGUILayout.LabelField("Result", EditorStyles.boldLabel);
+
+        using (new EditorGUI.DisabledScope(true))
+        {
+            EditorGUILayout.Toggle("Has Point", hasPoint);
+            EditorGUILayout.Vector3Field("World", lastWorld);
+        }
+
+        using (new EditorGUI.DisabledScope(!hasPoint))
+        {
+            if (GUILayout.Button("Copy (x,y,z)"))
+            {
+                EditorGUIUtility.systemCopyBuffer = FormatVec(lastWorld, decimals);
+            }
+        }
+
+        EditorGUILayout.HelpBox(
+            "Move mouse in Scene View. The window shows world position under cursor.\n" +
+            "3D uses ray-plane intersection (choose plane). 2D обычно: XY @ Z=0.",
+            MessageType.Info);
+    }
+
+    private void OnSceneGUI(SceneView sv)
+    {
+        if (!lockToSceneView && sv != SceneView.lastActiveSceneView) return;
+
+        var e = Event.current;
+        if (e == null) return;
+
+        // Берём позицию мыши только когда курсор над SceneView
+        if (e.type != EventType.MouseMove && e.type != EventType.MouseDrag && e.type != EventType.Repaint)
+            return;
+
+        Ray ray = HandleUtility.GUIPointToWorldRay(e.mousePosition);
+
+        hasPoint = TryGetPoint(ray, sv.camera, out lastWorld);
+
+        // чтобы окно обновлялось живо
+        Repaint();
+    }
+
+    private bool TryGetPoint(Ray ray, Camera cam, out Vector3 world)
+    {
+        // Для CameraFacing: плоскость, перпендикулярная камере, проходящая через origin камеры + (forward * planeOffset)
+        Plane plane;
+
+        switch (planeMode)
+        {
+            case PlaneMode.XY:
+                plane = new Plane(Vector3.forward, new Vector3(0f, 0f, planeOffset)); // Z = offset
+                break;
+
+            case PlaneMode.XZ:
+                plane = new Plane(Vector3.up, new Vector3(0f, planeOffset, 0f)); // Y = offset
+                break;
+
+            case PlaneMode.YZ:
+                plane = new Plane(Vector3.right, new Vector3(planeOffset, 0f, 0f)); // X = offset
+                break;
+
+            case PlaneMode.CameraFacing:
+            default:
+                var normal = cam.transform.forward;
+                var point = cam.transform.position; // можно поменять на position + forward*dist если надо
+                plane = new Plane(normal, point);
+                break;
+        }
+
+        if (plane.Raycast(ray, out float enter))
+        {
+            world = ray.GetPoint(enter);
+            return true;
+        }
+
+        world = default;
+        return false;
+    }
+
+    private static string FormatVec(Vector3 v, int d)
+    {
+        string f = "F" + Mathf.Clamp(d, 0, 6);
+        return $"{v.x.ToString(f)}, {v.y.ToString(f)}, {v.z.ToString(f)}";
+    }
+}
+#endif

Assets/Scripts/Editor/MouseWorldPositionWindow.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: eedb77236baea004994341514803f9e7