diff --git a/build/msbuild/MPM-Geomechanics.vcxproj b/build/msbuild/MPM-Geomechanics.vcxproj
index 297ba28..e23dea9 100644
--- a/build/msbuild/MPM-Geomechanics.vcxproj
+++ b/build/msbuild/MPM-Geomechanics.vcxproj
@@ -105,7 +105,7 @@
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <AdditionalIncludeDirectories>$(SolutionDir)../../inc</AdditionalIncludeDirectories>
     </ClCompile>
@@ -120,7 +120,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions); _CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <AdditionalIncludeDirectories>$(SolutionDir)../../inc</AdditionalIncludeDirectories>
       <OpenMPSupport>true</OpenMPSupport>
@@ -164,6 +164,7 @@
     <ClCompile Include="..\..\src\SolverExplicitTwoPhaseUSL.cpp" />
     <ClCompile Include="..\..\src\SolverExplicitUSL.cpp" />
     <ClCompile Include="..\..\src\States.cpp" />
+    <ClCompile Include="..\..\src\STLReader.cpp" />
     <ClCompile Include="..\..\src\Update.cpp" />
     <ClCompile Include="..\..\src\Warning.cpp" />
     <ClCompile Include="..\..\tests\deformation-gradient\testDeformationGradient.cpp">
@@ -178,6 +179,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
+    <ClCompile Include="..\..\tests\stl-mesh-reader\stl-mesh-reader-test.cpp">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\inc\Body\Body.h" />
@@ -201,6 +206,7 @@
     <ClInclude Include="..\..\inc\Mesh\Mesh.h" />
     <ClInclude Include="..\..\inc\Mesh\Node.h" />
     <ClInclude Include="..\..\inc\Mesh\NodeMixture.h" />
+    <ClInclude Include="..\..\inc\Mesh\STLReader.h" />
     <ClInclude Include="..\..\inc\Model.h" />
     <ClInclude Include="..\..\inc\MPM.h" />
     <ClInclude Include="..\..\inc\Output.h" />
diff --git a/build/msbuild/MPM-Geomechanics.vcxproj.filters b/build/msbuild/MPM-Geomechanics.vcxproj.filters
index 1f54844..c879136 100644
--- a/build/msbuild/MPM-Geomechanics.vcxproj.filters
+++ b/build/msbuild/MPM-Geomechanics.vcxproj.filters
@@ -40,6 +40,10 @@
       <Filter>tests</Filter>
     </ClCompile>
     <ClCompile Include="..\..\src\BodySphere.cpp" />
+    <ClCompile Include="..\..\src\STLReader.cpp" />
+    <ClCompile Include="..\..\tests\stl-mesh-reader\stl-mesh-reader-test.cpp">
+      <Filter>tests</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\inc\Body\Body.h" />
@@ -77,6 +81,7 @@
     <ClInclude Include="..\..\inc\Update.h" />
     <ClInclude Include="..\..\inc\Warning.h" />
     <ClInclude Include="..\..\inc\Body\BodySphere.h" />
+    <ClInclude Include="..\..\inc\Mesh\STLReader.h" />
   </ItemGroup>
   <ItemGroup>
     <Filter Include="tests">
diff --git a/build/msbuild/MPM-Geomechanics.vcxproj.user b/build/msbuild/MPM-Geomechanics.vcxproj.user
index 8052d4a..f428d85 100644
--- a/build/msbuild/MPM-Geomechanics.vcxproj.user
+++ b/build/msbuild/MPM-Geomechanics.vcxproj.user
@@ -1,8 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <LocalDebuggerCommandArguments>boussinesq-problem.json</LocalDebuggerCommandArguments>
-    <LocalDebuggerWorkingDirectory>C:\Users\fabri\MPM\MPM-Geomechanics\tests\boussinesq problem</LocalDebuggerWorkingDirectory>
+    <LocalDebuggerCommandArguments>plane-slope-ASCII.stl</LocalDebuggerCommandArguments>
+    <LocalDebuggerWorkingDirectory>C:\Users\fabri\MPM\MPM-Geomechanics\tests\stl-mesh-reader\</LocalDebuggerWorkingDirectory>
+    <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LocalDebuggerCommandArguments>
+    </LocalDebuggerCommandArguments>
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
   </PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/inc/Mesh/Node.h b/inc/Mesh/Node.h
index 35f2af5..5b4b0e1 100644
--- a/inc/Mesh/Node.h
+++ b/inc/Mesh/Node.h
@@ -12,7 +12,7 @@
 using Eigen::Vector3d;
 
 /// \class Node
-/// \brief Represents a mesh node.
+/// \brief Represents a mesh node
 class Node {
 
 public:
diff --git a/inc/Mesh/STLReader.h b/inc/Mesh/STLReader.h
new file mode 100644
index 0000000..cfb06b9
--- /dev/null
+++ b/inc/Mesh/STLReader.h
@@ -0,0 +1,39 @@
+#ifndef STL_READER_H
+#define STL_READER_H
+
+#include <Eigen/Eigenvalues>
+using namespace Eigen;
+
+#include <string>
+#include <vector>
+
+/// @brief Struct representing a triangle
+struct Triangle {
+    Vector3f normal;
+    Vector3f v1, v2, v3;
+};
+
+/// @brief Class to read STL files
+class STLReader {
+
+public:
+    /// @brief Read the STL file
+    bool read(const std::string& filename);
+    
+    /// @brief Get the triangles of the STL mesh 
+    /// @return Vector containing the triangles
+    const std::vector<Triangle>& getTriangles() const;
+
+private:
+    
+    /// @brief Vector containing the triangles
+    std::vector<Triangle> triangles;
+    
+    /// @brief Read the ASCII STL file
+    bool readASCII(std::ifstream& file);
+    
+    /// @brief Read the binary STL file
+    bool readBinary(std::ifstream& file);
+};
+
+#endif
diff --git a/src/STLReader.cpp b/src/STLReader.cpp
new file mode 100644
index 0000000..e682e78
--- /dev/null
+++ b/src/STLReader.cpp
@@ -0,0 +1,90 @@
+#include "Mesh/STLReader.h"
+#include <iostream>
+#include <fstream>
+#include <sstream>
+
+bool STLReader::read(const std::string& filename)
+{
+    // open the file
+    std::ifstream file(filename, std::ios::binary);
+    if (!file.is_open()) {
+        std::cerr << "Error opening STL file: " << filename << std::endl;
+        return false;
+    }
+ 
+    // read header to determine the format
+    char header[80];
+    file.read(header, 80);
+
+    // determine if it is ASCII or binary
+    std::string headerStr(header, 80);
+    if (headerStr.find("solid") == 0) {
+        file.close();
+        file.open(filename); // open it in text mode
+        return readASCII(file);
+    } else {
+        return readBinary(file);
+    }
+}
+
+bool STLReader::readASCII(std::ifstream& file) 
+{
+    // clear triangles
+    triangles.clear();
+
+    std::string line;
+    while (std::getline(file, line))
+    {
+        std::istringstream ss(line);
+        std::string word;
+        ss >> word;
+
+        if (word == "facet") 
+        {
+            Triangle triangle;
+            ss >> word >> triangle.normal.x() >> triangle.normal.y() >> triangle.normal.z();
+
+			// read vertex coordinates
+            std::getline(file, line);  // outer loop
+            std::getline(file, line);
+            std::sscanf(line.c_str(), " vertex %f %f %f", &triangle.v1.x(), &triangle.v1.y(), &triangle.v1.z());
+
+            std::getline(file, line);
+            std::sscanf(line.c_str(), " vertex %f %f %f", &triangle.v2.x(), &triangle.v2.y(), &triangle.v2.z());
+
+            std::getline(file, line);
+            std::sscanf(line.c_str(), " vertex %f %f %f", &triangle.v3.x(), &triangle.v3.y(), &triangle.v3.z());
+
+            triangles.push_back(triangle);
+
+            std::getline(file, line);  // end loop
+            std::getline(file, line);  // end facet
+        }
+    }
+    return true;
+}
+
+bool STLReader::readBinary(std::ifstream& file) {
+    
+    // clear triangles
+    triangles.clear();
+
+    uint32_t numTriangles;
+    
+    file.read(reinterpret_cast<char*>(&numTriangles), sizeof(uint32_t));
+
+    for (uint32_t i = 0; i < numTriangles; ++i) {
+        Triangle triangle;
+        file.read(reinterpret_cast<char*>(&triangle.normal), sizeof(Vector2d));
+        file.read(reinterpret_cast<char*>(&triangle.v1), sizeof(Vector2d));
+        file.read(reinterpret_cast<char*>(&triangle.v2), sizeof(Vector2d));
+        file.read(reinterpret_cast<char*>(&triangle.v3), sizeof(Vector2d));
+        file.ignore(2); // Ignore attributes for now
+        triangles.push_back(triangle);
+    }
+    return true;
+}
+
+const std::vector<Triangle>& STLReader::getTriangles() const {
+    return triangles;
+}
\ No newline at end of file
diff --git a/tests/stl-mesh-reader/plane-slope-ASCII.stl b/tests/stl-mesh-reader/plane-slope-ASCII.stl
new file mode 100644
index 0000000..ae3446d
--- /dev/null
+++ b/tests/stl-mesh-reader/plane-slope-ASCII.stl
@@ -0,0 +1,1388 @@
+solid Created by Gmsh
+facet normal 0.707107 -2.41646e-16 0.707107
+  outer loop
+    vertex 3.17954241480685 3.250437217869697 6.82045758519315
+    vertex 3.969582167509996 3.415445991536189 6.030417832490004
+    vertex 3.6431698024793 4.169695949820518 6.356830197520701
+  endloop
+endfacet
+facet normal 0.707107 0 0.707107
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diff --git a/tests/stl-mesh-reader/plane-slope-Binary.stl b/tests/stl-mesh-reader/plane-slope-Binary.stl
new file mode 100644
index 0000000..db1ecc7
Binary files /dev/null and b/tests/stl-mesh-reader/plane-slope-Binary.stl differ
diff --git a/tests/stl-mesh-reader/plane-slope.geo b/tests/stl-mesh-reader/plane-slope.geo
new file mode 100644
index 0000000..c35aa68
--- /dev/null
+++ b/tests/stl-mesh-reader/plane-slope.geo
@@ -0,0 +1,18 @@
+
+// Define the mesh size
+mesh_size = 1.0;
+
+// Define the geometrical parameters
+h=10;
+b=5;
+l=10;
+
+// Define the points
+Point(1) = {0, 0, h, mesh_size};
+Point(2) = {l, 0, 0, mesh_size};
+//+
+Line(1) = {1, 2};
+//+
+Extrude {0, b, 0} {
+  Curve{1}; 
+}
diff --git a/tests/stl-mesh-reader/stl-mesh-reader-test.cpp b/tests/stl-mesh-reader/stl-mesh-reader-test.cpp
new file mode 100644
index 0000000..c1a4a6b
--- /dev/null
+++ b/tests/stl-mesh-reader/stl-mesh-reader-test.cpp
@@ -0,0 +1,34 @@
+#include "Mesh/STLReader.h"
+#include <iostream>
+
+void print_stl_mesh_info(STLReader reader)
+{
+    // print the number of triangles
+    const auto& triangles = reader.getTriangles();
+    std::cout << "Number of triangles: " << triangles.size() << std::endl;
+
+    // print the vertexes of the triangles
+    for (const auto& tri : triangles) {
+        std::cout << "Vertex 1: (" << tri.v1.x() << ", " << tri.v1.y() << ", " << tri.v1.z() << ")" << std::endl;
+        std::cout << "Vertex 2: (" << tri.v2.x() << ", " << tri.v2.y() << ", " << tri.v2.z() << ")" << std::endl;
+        std::cout << "Vertex 3: (" << tri.v3.x() << ", " << tri.v3.y() << ", " << tri.v3.z() << ")" << std::endl;
+    }
+}
+
+int main(int argc, char* argv[])
+{    
+    std::string filename = argv[1];
+    
+    std::cout <<"Filename:" << filename << std::endl;
+
+    STLReader reader;
+
+    if (!reader.read(filename)) {
+        std::cerr << "Error reading mesh ..." << std::endl;
+        return -1;
+    }
+    
+    print_stl_mesh_info(reader);
+    
+    return 0;
+}
\ No newline at end of file