试着做下光影玩法

2025-10-13 11:10:52 +08:00
parent 45793ba957
commit 0fd74a1a45
14 changed files with 1331 additions and 109 deletions
--- a/Assets/Scripts/Test/Light/ShadowColliderGenerator.cs
+++ b/Assets/Scripts/Test/Light/ShadowColliderGenerator.cs
@@ -0,0 +1,124 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+public class ShadowColliderGenerator : MonoBehaviour
+{
+    public Camera shadowCamera;      // ר<><D7A8><EFBFBD><EFBFBD>Ⱦ<EFBFBD><C8BE>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    public RenderTexture shadowRT;   // <20><>Ⱦ<EFBFBD><C8BE><EFBFBD><EFBFBD>
+    public LayerMask shadowCasterLayer; // Ͷ<><CDB6><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    public float colliderPrecision = 0.1f; // <20><>ײ<EFBFBD>徫<EFBFBD><E5BEAB>
+
+    private Texture2D processedTexture;
+    private PolygonCollider2D polygonCollider;
+
+    void Start()
+    {
+        // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>Ⱦ<EFBFBD><C8BE><EFBFBD><EFBFBD>
+        shadowRT = new RenderTexture(512, 512, 24);
+        shadowCamera.targetTexture = shadowRT;
+
+        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><C3B5><EFBFBD><EFBFBD><EFBFBD>
+        processedTexture = new Texture2D(512, 512, TextureFormat.RGB24, false);
+
+        polygonCollider = GetComponent<PolygonCollider2D>();
+        if (polygonCollider == null)
+            polygonCollider = gameObject.AddComponent<PolygonCollider2D>();
+    }
+
+    void Update()
+    {
+        GenerateShadowCollider();
+    }
+
+    void GenerateShadowCollider()
+    {
+        // 1. <20><>Ⱦ<EFBFBD><C8BE>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        shadowCamera.Render();
+
+        // 2. <20><>GPU<50><55>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>CPU
+        RenderTexture.active = shadowRT;
+        processedTexture.ReadPixels(new Rect(0, 0, shadowRT.width, shadowRT.height), 0, 0);
+        processedTexture.Apply();
+        RenderTexture.active = null;
+
+        // 3. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0>Ե
+        List<Vector2> edgePoints = DetectEdges(processedTexture);
+
+        // 4. ת<><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>겢<EFBFBD><EAB2A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ײ<EFBFBD><D7B2>
+        if (edgePoints.Count > 2)
+        {
+            List<Vector2> worldPoints = ConvertToWorldCoordinates(edgePoints);
+            polygonCollider.SetPath(0, worldPoints);
+        }
+    }
+
+    List<Vector2> DetectEdges(Texture2D texture)
+    {
+        List<Vector2> edges = new List<Vector2>();
+        Color[] pixels = texture.GetPixels();
+
+        int width = texture.width;
+        int height = texture.height;
+
+        // <20>򵥵ı<F2B5A5B5>Ե<EFBFBD><D4B5><EFBFBD><EFBFBD><EFBFBD>㷨
+        for (int y = 1; y < height - 1; y += (int)(1f / colliderPrecision))
+        {
+            for (int x = 1; x < width - 1; x += (int)(1f / colliderPrecision))
+            {
+                int index = y * width + x;
+
+                // <20><><EFBFBD>鵱ǰ<E9B5B1><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD><CEA7><EFBFBD>صĲ<D8B5><C4B2><EFBFBD>
+                if (IsEdgePixel(pixels, index, width))
+                {
+                    edges.Add(new Vector2(x, y));
+                }
+            }
+        }
+
+        return edges;
+    }
+
+    bool IsEdgePixel(Color[] pixels, int index, int width)
+    {
+        Color current = pixels[index];
+        float currentBrightness = current.r + current.g + current.b;
+
+        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        float[] neighborBrightness = new float[4]
+        {
+            pixels[index - 1].r + pixels[index - 1].g + pixels[index - 1].b,    // <20><>
+            pixels[index + 1].r + pixels[index + 1].g + pixels[index + 1].b,    // <20><>
+            pixels[index - width].r + pixels[index - width].g + pixels[index - width].b, // <20><>
+            pixels[index + width].r + pixels[index + width].g + pixels[index + width].b  // <20><>
+        };
+
+        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ھӲ<DABE><D3B2><EFBFBD><EFBFBD>ϴ<EFBFBD><CFB4><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>Ǳ<EFBFBD>Ե
+        float threshold = 0.3f;
+        for (int i = 0; i < 4; i++)
+        {
+            if (Mathf.Abs(currentBrightness - neighborBrightness[i]) > threshold)
+                return true;
+        }
+
+        return false;
+    }
+
+    List<Vector2> ConvertToWorldCoordinates(List<Vector2> texturePoints)
+    {
+        List<Vector2> worldPoints = new List<Vector2>();
+        Bounds wallBounds = GetComponent<Collider2D>().bounds;
+
+        foreach (Vector2 point in texturePoints)
+        {
+            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊǽ<CEAA><C7BD><EFBFBD>ֲ<EFBFBD><D6B2><EFBFBD><EFBFBD><EFBFBD>
+            Vector2 localPoint = new Vector2(
+                point.x / shadowRT.width * wallBounds.size.x - wallBounds.size.x * 0.5f,
+                point.y / shadowRT.height * wallBounds.size.y - wallBounds.size.y * 0.5f
+            );
+
+            worldPoints.Add(localPoint);
+        }
+
+        return worldPoints;
+    }
+}