diff --git a/network_process/src/process.cpp b/network_process/src/process.cpp
index f43d3e9..d530805 100644
--- a/network_process/src/process.cpp
+++ b/network_process/src/process.cpp
@@ -21,8 +21,8 @@ void export_halfpatch_obj(
         mtl << "newmtl patch_" << patch_idx << (is_forward ? "_in" : "_out") << "\n";
         // 随机或规律分配颜色
         float r = float(patch_idx % 7) / 7.0f;
-        float g = is_forward ? 0.8f : 0.2f;
-        float b = 1.0f - r;
+        float g = float(patch_idx % 3) / 3.0f;
+        float b = float(patch_idx % 5) / 5.0f;
         mtl << "Kd " << r << " " << g << " " << b << "\n";
     }
     mtl.close();