diff --git a/engine/Consts.h b/engine/Consts.h
index 5b17d4f..b46af7c 100644
--- a/engine/Consts.h
+++ b/engine/Consts.h
@@ -13,7 +13,7 @@ namespace Consts {
     const sf::Color BACKGROUND_COLOR = sf::Color(255, 255, 255);
     const std::string PROJECT_NAME = "engine";
     const bool USE_LOG_FILE = true;
-    const bool USE_OPEN_GL = false;
+    const bool USE_OPEN_GL = true;
     const bool SHOW_COORDINATES = true;
 
     const double PI = 3.14159265358979323846264338327950288;
diff --git a/engine/Matrix4x4.cpp b/engine/Matrix4x4.cpp
index 7ded573..0b1e8ee 100644
--- a/engine/Matrix4x4.cpp
+++ b/engine/Matrix4x4.cpp
@@ -188,16 +188,6 @@ Matrix4x4 Matrix4x4::ScreenSpace(int width, int height) {
     return s;
 }
 
-Matrix4x4 Matrix4x4::Model(const Matrix4x4 &transformMatrix, const Vec3D &position) {
-    Matrix4x4 M(transformMatrix);
-
-    M._arr[0][3] = position.x();
-    M._arr[1][3] = position.y();
-    M._arr[2][3] = position.z();
-
-    return M;
-}
-
 Matrix4x4 Matrix4x4::View(const Vec3D &left, const Vec3D &up, const Vec3D &lookAt, const Vec3D &eye) {
     Matrix4x4 V = Zero();
 
diff --git a/engine/Matrix4x4.h b/engine/Matrix4x4.h
index 263b70d..43563fd 100644
--- a/engine/Matrix4x4.h
+++ b/engine/Matrix4x4.h
@@ -38,7 +38,6 @@ public:
     Matrix4x4 static RotationZ (double rz);
     Matrix4x4 static Rotation (const Vec3D& v, double rv);
 
-    Matrix4x4 static Model(const Matrix4x4& transformMatrix, const Vec3D &position);
     Matrix4x4 static View(const Vec3D &left, const Vec3D &up, const Vec3D &lookAt, const Vec3D &eye);
     Matrix4x4 static Projection (double fov = 90.0, double aspect = 1.0, double ZNear = 1.0, double ZFar = 10.0);
     Matrix4x4 static ScreenSpace (int width, int height);
diff --git a/engine/Object.h b/engine/Object.h
index 07c3b95..f3380aa 100644
--- a/engine/Object.h
+++ b/engine/Object.h
@@ -39,7 +39,7 @@ private:
     Vec3D _angleLeftUpLookAt{0, 0, 0};
 public:
     explicit Object(ObjectNameTag nameTag) : _nameTag(std::move(nameTag)) {};
-    explicit Object(const Object& object) : _nameTag(object.name()), _transformMatrix(object.model()) {};
+    Object(const Object& object) : _nameTag(object.name()), _transformMatrix(object.model()) {};
 
     // TODO: add transform(const Matrix4x4& t)
     // TODO: add transformRelativePoint(const Vec3D &point, const Matrix4x4& transform)
@@ -71,7 +71,7 @@ public:
 
     [[nodiscard]] ObjectNameTag name() const { return _nameTag; }
 
-    [[nodiscard]] Matrix4x4 model() const { return Matrix4x4::Model(_transformMatrix, _position); }
+    [[nodiscard]] Matrix4x4 model() const { return Matrix4x4::Translation(_position) * _transformMatrix; }
 
     // OpenGL function
     [[nodiscard]] GLfloat* glModel() const;
diff --git a/img/opengl.png b/img/opengl.png
index 4269c34..fb4bee3 100644
Binary files a/img/opengl.png and b/img/opengl.png differ