diff --git a/shaders/texture_loading/glsl/texture.frag b/shaders/texture_loading/glsl/texture.frag
index 6943e81..4b643fd 100644
--- a/shaders/texture_loading/glsl/texture.frag
+++ b/shaders/texture_loading/glsl/texture.frag
@@ -1,6 +1,7 @@
 #version 450
 
 layout (binding = 1) uniform sampler2D samplerColor;
+layout (binding = 2) uniform sampler2D samplerColor_ex;
 
 layout (location = 0) in vec2 inUV;
 layout (location = 1) in vec3 inNormal;
@@ -11,16 +12,27 @@ layout (location = 0) out vec4 outFragColor;
 void main() 
 {
 	vec4 color = texture(samplerColor, inUV);
+	vec4 color_ex = texture(samplerColor_ex, inUV);
 
 	vec3 N = normalize(inNormal);
 
 	vec4 textureColor = color;
-	if (textureColor.a < 0.1) {
+
+	//if (textureColor.a < 0.1) 
+	//{
         //textureColor = vec4(0.2, 0.2, 0.2, 0.5); 
-		discard;
-    }
+	//	discard;
+    //}
+
+	// 计算与 (0,0,1) 的点乘
+    float ndot = dot(N, vec3(0.0, 0.0, -1.0));
+
+	// 保证结果 >= 0
+    ndot = max(ndot, 0.0);
 	
-	outFragColor = textureColor;
+	vec4 blendedColor = mix(color_ex, color, ndot);
+
+	outFragColor = blendedColor;
 
 //	outFragColor = vec4(1, 0, 0, 1);
 }
\ No newline at end of file
diff --git a/shaders/texture_loading/glsl/texture.frag.spv b/shaders/texture_loading/glsl/texture.frag.spv
index dfcd420..6bbc39d 100644
Binary files a/shaders/texture_loading/glsl/texture.frag.spv and b/shaders/texture_loading/glsl/texture.frag.spv differ