diff --git a/wifi/estimate/ray3/OBJPool.h b/wifi/estimate/ray3/OBJPool.h
index c8eea61..d76edaf 100644
--- a/wifi/estimate/ray3/OBJPool.h
+++ b/wifi/estimate/ray3/OBJPool.h
@@ -9,8 +9,9 @@
 #include "Obstacle3.h"
 
 // LINUX ONLY
-#include <dirent.h>
-#include <stdio.h>
+//#include <dirent.h>
+//#include <stdio.h>
+#include <experimental/filesystem>
 
 
 namespace Ray3D {
@@ -42,19 +43,26 @@ namespace Ray3D {
 			initDone = true;
 
 			// LINUX ONLY!
-			DIR* d = opendir(folder.c_str());
-			if (!d) {throw Exception("OBJPool: folder not found: " + folder);}
+			//DIR* d = opendir(folder.c_str());
+			//if (!d) {throw Exception("OBJPool: folder not found: " + folder);}
+			std::experimental::filesystem::path d(folder);
+			if (!std::experimental::filesystem::exists(d)) {
+				throw Exception("OBJPool: folder not found: " + folder);
+			}
 
-			struct dirent *dir;
-			while ((dir = readdir(d)) != NULL) {
-				const std::string absFile = folder + "/" + dir->d_name;
+			//struct dirent *dir;
+			//while ((dir = readdir(d)) != NULL) {
+			for (std::experimental::filesystem::directory_entry entry : std::experimental::filesystem::directory_iterator(d)) {
+				//const std::string absFile = folder + "/" + dir->d_name;
+				const std::string absFile = entry.path().native();
 				if (endsWith(absFile, ".obj")) {
-					std::string name = std::string(dir->d_name);
+					//std::string name = std::string(dir->d_name);
+					std::string name = entry.path().filename();
 					name = name.substr(0, name.length() - 4);	// without extension
 					load(absFile, name);
 				}
 			}
-			closedir(d);
+			//closedir(d);
 
 		}
 
diff --git a/wifi/estimate/ray3/OBJReader.h b/wifi/estimate/ray3/OBJReader.h
index c5b7316..a08a804 100644
--- a/wifi/estimate/ray3/OBJReader.h
+++ b/wifi/estimate/ray3/OBJReader.h
@@ -160,7 +160,7 @@ private:
 		}
 
 		// sanity check
-		if (numVertices != 3) {throw "this face is not a triangle!";}
+//		if (numVertices != 3) {throw "this face is not a triangle!";}
 
 	}