上材质，有个新gameelement在basic主题包里记得改

Assets/ThemeBundles/Basic/Materials/PseudoShadow.shader

@@ -10,7 +10,7 @@ Shader "Custom/ImprovedPseudoShadow" {
         _ShadowSmoothness ("Shadow Smoothness", Range(0,1)) = 0.1
 
         [Header(Lighting Mode)]
-        [Toggle(USE_WORLD_LIGHT)] _UseWorldLight ("Use Fixed World Light?", Float) = 0
+        _UseWorldLight ("Use Fixed World Light?", Range(0,1)) = 0
         _FakeLightDir ("Fake Light Dir (XYZ)", Vector) = (0.5, 1, 0.5, 0) // 模拟从右上方来的光
     }
 
@@ -24,9 +24,6 @@ Shader "Custom/ImprovedPseudoShadow" {
             #pragma fragment frag
             // 开启 GPU Instancing 支持
             #pragma multi_compile_instancing
-            // 开启着色器变体以支持两种光照模式
-            #pragma shader_feature USE_WORLD_LIGHT
-            
             #include "UnityCG.cginc"
 
             struct appdata {
@@ -53,6 +50,7 @@ Shader "Custom/ImprovedPseudoShadow" {
                 UNITY_DEFINE_INSTANCED_PROP(float4, _FakeLightDir)
                 UNITY_DEFINE_INSTANCED_PROP(float, _ShadowThreshold)
                 UNITY_DEFINE_INSTANCED_PROP(float, _ShadowSmoothness)
+                UNITY_DEFINE_INSTANCED_PROP(float, _UseWorldLight)
             UNITY_INSTANCING_BUFFER_END(Props)
 
             v2f vert (appdata v) {
@@ -66,23 +64,14 @@ Shader "Custom/ImprovedPseudoShadow" {
                 float3 normalWorld = UnityObjectToWorldNormal(v.normal);
                 float3 lightDir;
 
-                #ifdef USE_WORLD_LIGHT
-                    // 改进1：使用固定的世界空间伪光照方向
-                    lightDir = normalize(UNITY_ACCESS_INSTANCED_PROP(Props, _FakeLightDir).xyz);
-                #else
-                    // 原版逻辑：使用视线方向 (Headlamp)
-                    // 注意：为了获得类似漫反射的效果，这里通常不需要取反，
-                    // 但如果要模拟“边缘光”则算法不同。这里沿用原文档的思路：面朝相机越亮。
-                    lightDir = normalize(WorldSpaceViewDir(v.vertex));
-                #endif
+                float useWorldLight = UNITY_ACCESS_INSTANCED_PROP(Props, _UseWorldLight);
+                float3 fakeDir = normalize(UNITY_ACCESS_INSTANCED_PROP(Props, _FakeLightDir).xyz);
+                float3 viewDir = normalize(WorldSpaceViewDir(v.vertex));
+                // 用lerp实现分支
+                lightDir = normalize(lerp(viewDir, fakeDir, useWorldLight));
 
-                // 点积计算 (-1 到 1)
                 float dotProduct = dot(normalWorld, lightDir);
-                
-                // 将点积结果保存，在片元阶段处理颜色，或者直接在这里计算
-                // 保持 Vertex Lighting 的高性能
                 o.lightFactor = dotProduct;
-
                 return o;
             }