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/RaycastShadowCollider.cs
+++ b/Assets/Scripts/Test/Light/RaycastShadowCollider.cs
@@ -0,0 +1,82 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+public class RaycastShadowCollider : MonoBehaviour
+{
+    public Light spotLight;          // <20>۹<EFBFBD><DBB9><EFBFBD>
+    public GameObject shadowCaster;  // Ͷ<><CDB6><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    public int rayCount = 36;        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    public float maxShadowDistance = 10f;
+
+    private PolygonCollider2D shadowCollider;
+
+    void Start()
+    {
+        shadowCollider = GetComponent<PolygonCollider2D>();
+        if (shadowCollider == null)
+            shadowCollider = gameObject.AddComponent<PolygonCollider2D>();
+    }
+
+    void Update()
+    {
+        UpdateShadowCollider();
+    }
+
+    void UpdateShadowCollider()
+    {
+        List<Vector2> shadowPoints = new List<Vector2>();
+
+        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߽<EFBFBD><DFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƹⷽ<C6B9><E2B7BD>Ͷ<EFBFBD><CDB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        Bounds bounds = shadowCaster.GetComponent<Renderer>().bounds;
+        Vector3[] boundPoints = GetBoundPoints(bounds);
+
+        foreach (Vector3 point in boundPoints)
+        {
+            Vector3 toLight = (spotLight.transform.position - point).normalized;
+            Ray ray = new Ray(point, toLight);
+            RaycastHit hit;
+
+            if (Physics.Raycast(ray, out hit, maxShadowDistance))
+            {
+                if (hit.collider.gameObject == gameObject) // <20><><EFBFBD><EFBFBD>ǽ<EFBFBD><C7BD>
+                {
+                    // ת<><D7AA><EFBFBD><EFBFBD>ǽ<EFBFBD><C7BD><EFBFBD>ľֲ<C4BE><D6B2><EFBFBD><EFBFBD><EFBFBD>ϵ
+                    Vector3 localHit = transform.InverseTransformPoint(hit.point);
+                    shadowPoints.Add(new Vector2(localHit.x, localHit.y));
+                }
+            }
+        }
+
+        // <20>Ե<EFBFBD><D4B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>γ<EFBFBD>͹<EFBFBD><CDB9>
+        if (shadowPoints.Count > 2)
+        {
+            List<Vector2> convexHull = ComputeConvexHull(shadowPoints);
+            shadowCollider.SetPath(0, convexHull);
+        }
+    }
+
+    Vector3[] GetBoundPoints(Bounds bounds)
+    {
+        return new Vector3[]
+        {
+            bounds.min,
+            bounds.max,
+            new Vector3(bounds.min.x, bounds.min.y, bounds.max.z),
+            new Vector3(bounds.min.x, bounds.max.y, bounds.min.z),
+            new Vector3(bounds.max.x, bounds.min.y, bounds.min.z),
+            new Vector3(bounds.min.x, bounds.max.y, bounds.max.z),
+            new Vector3(bounds.max.x, bounds.min.y, bounds.max.z),
+            new Vector3(bounds.max.x, bounds.max.y, bounds.min.z)
+        };
+    }
+
+    // ͹<><CDB9><EFBFBD>㷨<EFBFBD><E3B7A8>Graham Scan<61><6E>
+    List<Vector2> ComputeConvexHull(List<Vector2> points)
+    {
+        if (points.Count < 3) return points;
+
+        // ʵ<><CAB5>͹<EFBFBD><CDB9><EFBFBD>㷨...
+        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9>Unity<74><79>Collider2D.CreatePrimitive<76><65><EFBFBD>ߵ<EFBFBD><DFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        return points; // <20>򻯷<EFBFBD><F2BBAFB7><EFBFBD>
+    }
+}