fix lossing resolution with memoried attribute of reference

AttributeCombiner.cpp

@@ -40,6 +40,7 @@
 
 #include <AttributeCombiner.h>
 #include <AttributeCombinerClass.h>
+#include <iomanip>
 
 
 /*----- PROTECTED REGION END -----*/	//	AttributeCombiner.cpp
@@ -1452,7 +1453,7 @@ void AttributeCombiner::add_dynamic_commands()
             item->refSize = length;
             
             stringstream ss;
-            ss << std::fixed;
+            ss << std::setprecision(17);
             for(int i = 0 ; i < length ; i++){
                 ss << item->refData[i] << ",";
             }