diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index bc6f4c26..704eaebc 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -80,7 +80,7 @@ add_subdirectory(model)
 add_subdirectory(renderer)
 
 
-add_subdirectory(Example)
 add_subdirectory(PolyFit)
+add_subdirectory(polyfit)
 
 
diff --git a/code/basic/CMakeLists.txt b/code/basic/CMakeLists.txt
index faca5906..4a56ec76 100644
--- a/code/basic/CMakeLists.txt
+++ b/code/basic/CMakeLists.txt
@@ -50,7 +50,7 @@ set(basic_SOURCES
     )
 
 
-add_library(${PROJECT_NAME} SHARED ${basic_SOURCES} ${basic_HEADERS})
+add_library(${PROJECT_NAME} STATIC ${basic_SOURCES} ${basic_HEADERS})
 set_target_properties(${PROJECT_NAME} PROPERTIES
                       FOLDER "PolyFit")
 
diff --git a/code/math/CMakeLists.txt b/code/math/CMakeLists.txt
index 1f97adc6..5b59d7b5 100644
--- a/code/math/CMakeLists.txt
+++ b/code/math/CMakeLists.txt
@@ -36,7 +36,7 @@ set(math_SOURCES
         )
 
 
-add_library(${PROJECT_NAME} SHARED ${math_SOURCES} ${math_HEADERS})
+add_library(${PROJECT_NAME} STATIC ${math_SOURCES} ${math_HEADERS})
 set_target_properties(${PROJECT_NAME} PROPERTIES
         FOLDER "PolyFit")
 
diff --git a/code/method/CMakeLists.txt b/code/method/CMakeLists.txt
index 74c511aa..c48160cd 100644
--- a/code/method/CMakeLists.txt
+++ b/code/method/CMakeLists.txt
@@ -24,7 +24,7 @@ set(method_SOURCES
         )
 
 
-add_library(${PROJECT_NAME} SHARED ${method_SOURCES} ${method_HEADERS})
+add_library(${PROJECT_NAME} STATIC ${method_SOURCES} ${method_HEADERS})
 set_target_properties(${PROJECT_NAME} PROPERTIES
         FOLDER "PolyFit")
 
diff --git a/code/model/CMakeLists.txt b/code/model/CMakeLists.txt
index 37ea7773..937ea8fb 100644
--- a/code/model/CMakeLists.txt
+++ b/code/model/CMakeLists.txt
@@ -49,7 +49,7 @@ set(model_SOURCES
     kdtree/kdTree.cpp
     )
 
-add_library(${PROJECT_NAME} SHARED ${model_SOURCES} ${model_HEADERS})
+add_library(${PROJECT_NAME} STATIC ${model_SOURCES} ${model_HEADERS})
 set_target_properties(${PROJECT_NAME} PROPERTIES
                       FOLDER "PolyFit")
 
diff --git a/code/Example/CMakeLists.txt b/code/polyfit/CMakeLists.txt
similarity index 100%
rename from code/Example/CMakeLists.txt
rename to code/polyfit/CMakeLists.txt
diff --git a/code/Example/main.cpp b/code/polyfit/main.cpp
similarity index 79%
rename from code/Example/main.cpp
rename to code/polyfit/main.cpp
index 135a772e..eb540e80 100644
--- a/code/Example/main.cpp
+++ b/code/polyfit/main.cpp
@@ -19,6 +19,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 
 #include "../basic/logger.h"
+#include "../basic/file_utils.h"
 #include "../model/point_set.h"
 #include "../model/map.h"
 #include "../method/method_global.h"
@@ -33,10 +34,23 @@ int main(int argc, char **argv)
     // initialize the logger (this is not optional)
     Logger::initialize();
 
-    // input point cloud file name
-    const std::string input_file = (argc > 1) ? argv[1] : std::string(POLYFIT_CODE_DIR) + "/../data/toy_data.bvg";
-    // output mesh file name
-    const std::string output_file = (argc > 2) ? argv[2] : std::string(POLYFIT_CODE_DIR) + "/../data/toy_data-result.obj";
+    if (argc != 3) {
+        std::cerr << "Usage:" << std::endl
+                  << "\t./polyfit  <input_file.[vg] or [bvg]>  <output_file.obj>" << std::endl
+                  << "Example:" << std::endl
+                  << "\t./polyfit  sphere.bvg  sphere-result.obj" << std::endl;
+        return EXIT_FAILURE;
+    }
+    const std::string input_file = argv[1];
+    if (!FileUtils::is_file(input_file)) {
+        std::cerr << "file '" << input_file << "' does not exist. Please check and make sure the path is correct" << std::endl;
+        return EXIT_FAILURE;
+    }
+    const std::string output_file = argv[2];
+    if (FileUtils::extension(output_file) != "obj") {
+        std::cerr << "the output file is expected to have 'obj' as file extension" << std::endl;
+        return EXIT_FAILURE;
+    }
 
     // below are the default parameters (change these when necessary)
     Method::lambda_data_fitting = 0.43;
diff --git a/code/renderer/CMakeLists.txt b/code/renderer/CMakeLists.txt
index 1a89a83e..5371ffaa 100644
--- a/code/renderer/CMakeLists.txt
+++ b/code/renderer/CMakeLists.txt
@@ -19,7 +19,7 @@ set(renderer_SOURCES
     )
 
 
-add_library(${PROJECT_NAME} SHARED ${renderer_SOURCES} ${renderer_HEADERS})
+add_library(${PROJECT_NAME} STATIC ${renderer_SOURCES} ${renderer_HEADERS})
 set_target_properties(${PROJECT_NAME} PROPERTIES
                       FOLDER "PolyFit")