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Assets/ThirdParty/Tools/DrawShadowMask/DrawShadowMask.cs

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+using System.Collections;
+using System.Collections.Generic;
+using Unity.Burst.CompilerServices;
+using UnityEngine;
+
+public class DrawShadowMask : MonoBehaviour
+{
+    public Texture2D shadowMaskTex;
+    public Material mat;
+    [Range(0, 1000)]
+    public float brushSize;
+    public bool isDrawing;
+    public Color color;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        Vector2Int centerPos = new Vector2Int((int)(0.5f * shadowMaskTex.width), (int)(0.5f * shadowMaskTex.height));
+
+        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;
+                Debug.Log(rang);
+
+                if (rang.x > 0 && rang.x < shadowMaskTex.width || rang.y > 0 && rang.y < shadowMaskTex.height)
+                {
+                    shadowMaskTex.SetPixel(rang.x, rang.y, Color.red);
+                    
+                }
+            }
+        }
+       
+        shadowMaskTex.Apply();
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+}