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Assets/ThirdParty/Tools/DrawShadowMask/Editor/DrawShadowMaskEditor.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.TextCore;
+using UnityEngine.UIElements;
+
+[CustomEditor(typeof(DrawShadowMask))]
+public class DrawShadowMaskEditor : Editor
+{
+    DrawShadowMask inst;
+    Ray ray;
+    RaycastHit hit;
+    float brushSize;
+    Vector2 centerPosRecord;
+
+    private void OnEnable()
+    {
+        inst = (DrawShadowMask)target;
+    }
+
+    public override void OnInspectorGUI()
+    {
+        base.OnInspectorGUI();
+
+        //
+        GUILayout.Space(100);
+        GUILayout.BeginHorizontal();
+        if (GUILayout.Button("Clear", GUILayout.Height(50)))
+        {
+            Clear();
+        }
+        if (GUILayout.Button("Fill", GUILayout.Height(50)))
+        {
+            Fill();
+        }
+        GUILayout.EndHorizontal();
+    }
+
+    void Clear()
+    {
+        for (int y = 0; y <= inst.shadowMaskTex.height; ++y)
+        {
+            for (int x = 0; x <= inst.shadowMaskTex.width; ++x)
+            {
+                inst.shadowMaskTex.SetPixel(x, y, Color.black);
+            }
+        }
+
+        inst.shadowMaskTex.Apply();
+    }
+
+    void Fill()
+    {
+        for (int y = 0; y <= inst.shadowMaskTex.height; ++y)
+        {
+            for (int x = 0; x <= inst.shadowMaskTex.width; ++x)
+            {
+                inst.shadowMaskTex.SetPixel(x, y, Color.white);
+            }
+        }
+
+        inst.shadowMaskTex.Apply();
+    }
+
+
+
+    private void OnSceneGUI()
+    {
+        if(!inst.shadowMaskTex && !inst.mat)
+        {
+            return;
+        }
+
+        if(Selection.activeObject == inst.gameObject)
+        {
+            HandleUtility.AddDefaultControl(GUIUtility.GetControlID(FocusType.Passive));
+
+            //
+            ray = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
+            if (Physics.Raycast(ray, out hit, 2000, 1 << LayerMask.NameToLayer("DrawHelp")))
+            {
+                if (Event.current.type == EventType.MouseDown && Event.current.button == 0)
+                {
+                    inst.isDrawing = true;
+                }
+
+                brushSize = inst.brushSize;
+
+                if (inst.isDrawing)
+                {
+                    Handles.color = Color.green;
+
+                    //
+                    Vector2Int centerPos = new Vector2Int((int)(hit.textureCoord.x * inst.shadowMaskTex.width), (int)(hit.textureCoord.y * inst.shadowMaskTex.height));
+                    if(centerPosRecord != centerPos)
+                    {
+                        centerPosRecord = centerPos;
+
+                        //
+                        Handles.color = Color.green;
+                        Handles.Label(hit.point, centerPos.ToString());
+
+                        for (int y = -(int)brushSize; y <= (int)brushSize; ++y)
+                        {
+                            for (int x = -(int)brushSize; x <= (int)brushSize; ++x)
+                            {
+                                Vector2Int rang = new Vector2Int(x, y) + centerPos;
+                                if (rang.x > 0 && rang.x < inst.shadowMaskTex.width || rang.y > 0 && rang.y < inst.shadowMaskTex.height)
+                                {
+                                    Color col = inst.shadowMaskTex.GetPixel(rang.x, rang.y);
+                                    float dis = 1 - 1 / Vector2.Distance(centerPos, rang);
+                                    inst.shadowMaskTex.SetPixel(rang.x, rang.y, Color.Lerp(inst.color, col, dis * (1 - inst.color.a)));
+                                }
+                            }
+                        }
+
+                        inst.shadowMaskTex.Apply();
+                    }
+                }
+
+                if (Event.current.type == EventType.MouseUp && Event.current.button == 0)
+                {
+                    inst.isDrawing = false;
+
+                    Handles.color = Color.red;
+                }
+
+                Handles.DrawWireDisc(hit.point, Vector3.up, brushSize * 0.1f);
+                SceneView.RepaintAll();
+            }
+        }
+    }
+}

Assets/ThirdParty/Tools/DrawShadowMask/Editor/DrawShadowMaskEditor.cs.meta

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