add an option for exporting the scene meshes even if they are identical with the others

Source/Tools/AssetImporter/AssetImporter.cpp

@@ -115,6 +115,7 @@ bool emissiveAO_ = false;
 bool noOverwriteMaterial_ = false;
 bool noOverwriteTexture_ = false;
 bool noOverwriteNewerTexture_ = false;
+bool noExportTwice4IdenticalMeshes = true;
 Vector<String> nonSkinningBoneIncludes_;
 Vector<String> nonSkinningBoneExcludes_;
 
@@ -233,6 +234,7 @@ void Run(const Vector<String>& arguments)
             "-cm         Check and do not overwrite if material exists\n"
             "-ct         Check and do not overwrite if texture exists\n"
             "-ctn        Check and do not overwrite if texture has newer timestamp\n"
+            "-full       Export all meshes even if they are identical with each other (scene mode only)\n"
         );
     }
     
@@ -359,6 +361,8 @@ void Run(const Vector<String>& arguments)
                 noOverwriteTexture_ = true;
             else if (argument == "ctn")
                 noOverwriteNewerTexture_ = true;
+            else if (argument == "full")
+                noExportTwice4IdenticalMeshes = false;
         }
     }
     
@@ -1185,6 +1189,7 @@ void CollectSceneModels(OutScene& scene, aiNode* node)
         
         // Check if a model with identical mesh indices already exists. If yes, do not export twice
         bool unique = true;
+        if (noExportTwice4IdenticalMeshes)
         for (unsigned i = 0; i < scene.models_.Size(); ++i)
         {
             if (scene.models_[i].meshIndices_ == model.meshIndices_)