完成双贴图效果，修改闪退的bug，换成赴宴的贴图

app/src/main/assets/shaders/texture.frag

@@ -6,27 +6,28 @@ layout (binding = 2) uniform sampler2D samplerColor_ex;
 layout (location = 0) in vec2 inUV;
 layout (location = 1) in vec3 inNormal;
 
+
 layout (location = 0) out vec4 outFragColor;
 
 void main() 
 {
-    vec4 color = texture(samplerColor, inUV);
-    vec4 color_ex = texture(samplerColor_ex, inUV);
+	vec4 color = texture(samplerColor, inUV);
+	vec4 color_ex = texture(samplerColor_ex, inUV);
 
-    vec3 N = normalize(inNormal);
+	vec3 N = normalize(inNormal);
 
     // 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
+	// 保证结果 >= 0
     ndot = max(ndot, 0.0);
     
     // 重新映射ndot值，让中间2/3部分进行融合
     // 当ndot在[0.166, 0.833]范围内时进行混合，两端保持不变
     float blendFactor;
-    if (ndot < 0.166) {
+    if (ndot < 0.266) {
         blendFactor = 0.0; // 完全使用color_ex
-    } else if (ndot > 0.833) {
+    } else if (ndot > 0.733) {
         blendFactor = 1.0; // 完全使用color
     } else {
         // 在中间2/3部分进行平滑过渡
@@ -41,5 +42,7 @@ void main()
     
     vec4 blendedColor = mix(color_ex, color, blendFactor);
 
-    outFragColor = blendedColor;
+	outFragColor = blendedColor;
+
+//	outFragColor = vec4(1, 0, 0, 1);
 }