diff --git a/src/Core/Crawl/defaultlight.cpp b/src/Core/Crawl/defaultlight.cpp
index e13fb94..51538ce 100644
--- a/src/Core/Crawl/defaultlight.cpp
+++ b/src/Core/Crawl/defaultlight.cpp
@@ -12,7 +12,7 @@ namespace CRAWL {
 DefaultLight::DefaultLight(): IWorldLight(AUTO_CLASS_NAME) {
     setColor("#fff8e7");
     setposition({10000, 0, 10000});
-    setRatation(QQuaternion::fromEulerAngles({-90,0,0}));
+    setRotation(QQuaternion::fromEulerAngles({-90,0,0}));
     setLightForce(110);
 }
 
diff --git a/src/Core/Crawl/groupobject.cpp b/src/Core/Crawl/groupobject.cpp
index d641dec..f263066 100644
--- a/src/Core/Crawl/groupobject.cpp
+++ b/src/Core/Crawl/groupobject.cpp
@@ -23,7 +23,7 @@ void GroupObject::render(unsigned int tbfMsec) {
 
         if (LocalPropertyes *props = getLocalPropertyes(object->guiId())) {
             if (!props->_rotation.isNull())
-                object->setRatation(_this->ratation() * props->_rotation);
+                object->setRotation(_this->rotation() * props->_rotation);
 
             object->setposition(_this->position() + props->_position);
         }
diff --git a/src/Core/Crawl/groupobject.h b/src/Core/Crawl/groupobject.h
index 55212a8..2857eeb 100644
--- a/src/Core/Crawl/groupobject.h
+++ b/src/Core/Crawl/groupobject.h
@@ -24,15 +24,15 @@ struct LocalPropertyes {
 };
 
 /**
- * @brief The GroupObject class is extansion with group object behavior.
- * ### Requeried functions: IWorldItem
+ * @brief The GroupObject class is extension with group object behavior.
+ * ### Requried child classes: IWorldItem
  *
- * This class have implementation of the render method that move all child object on selected local positions in parent object.
+ * This class have implementation of the render method that move all child objects on selected local positions on parent object.
  *
  * ## Example of use
  *
  * ### For what this object uses
- * This object will be very convinent wher you want to create a difecly claster object with multiple subobjects that should contains in the parrent root object.
+ *This object will be very convenient where you want to create a directly cluster object with multiple sub objects that should contains in the parent root object.
  * For example : weapon of the player.
  *
  * ### Example of use
diff --git a/src/Core/Crawl/guiobject.cpp b/src/Core/Crawl/guiobject.cpp
index e9dc911..6ebddec 100644
--- a/src/Core/Crawl/guiobject.cpp
+++ b/src/Core/Crawl/guiobject.cpp
@@ -17,7 +17,7 @@ GuiObject::GuiObject(const QString &name, const QString &viewTempalte, QObject *
     _viewTemplate = viewTempalte;
     _className = name;
     generateId();
-    setRatation(QQuaternion::fromEulerAngles({0,0,0}));
+    setRotation(QQuaternion::fromEulerAngles({0,0,0}));
 }
 
 const QString& GuiObject::color() const {
@@ -173,15 +173,15 @@ void GuiObject::setSize(const QVector3D &newSize) {
     emit sizeChanged();
 }
 
-const QQuaternion &GuiObject::ratation() const {
-    return _ratation;
+const QQuaternion &GuiObject::rotation() const {
+    return _rotation;
 }
 
-void GuiObject::setRatation(const QQuaternion &newRatation) {
-    if (_ratation == newRatation)
+void GuiObject::setRotation(const QQuaternion &newRotation) {
+    if (_rotation == newRotation)
         return;
-    _ratation = newRatation;
-    emit ratationChanged();
+    _rotation = newRotation;
+    emit rotationChanged();
 }
 
 const QString &GuiObject::mash() const {
diff --git a/src/Core/Crawl/guiobject.h b/src/Core/Crawl/guiobject.h
index b307b27..df47721 100644
--- a/src/Core/Crawl/guiobject.h
+++ b/src/Core/Crawl/guiobject.h
@@ -30,7 +30,7 @@ namespace CRAWL {
  *
  * The gui objct contains base properties for drow objects on scane
  * * position
- * * ratation
+ * * rotation
  * * mash
  * * and map textures
  *
@@ -66,7 +66,7 @@ class CRAWL_EXPORT GuiObject: public QObject, virtual public IRender {
 
     Q_PROPERTY(QVector3D position READ position WRITE setposition NOTIFY positionChanged)
     Q_PROPERTY(QVector3D size READ size WRITE setSize NOTIFY sizeChanged)
-    Q_PROPERTY(QQuaternion ratation READ ratation WRITE setRatation NOTIFY ratationChanged)
+    Q_PROPERTY(QQuaternion rotation READ rotation WRITE setRotation NOTIFY rotationChanged)
 
     Q_PROPERTY(QString mash READ mash WRITE setMash NOTIFY mashChanged)
 
@@ -133,8 +133,8 @@ public:
     const QVector3D &size() const;
     void setSize(const QVector3D &newSize);
 
-    const QQuaternion &ratation() const;
-    void setRatation(const QQuaternion &newRatation);
+    const QQuaternion &rotation() const;
+    void setRotation(const QQuaternion &newRotation);
 
     const QString &mash() const;
     void setMash(const QString &newMash);
@@ -171,7 +171,7 @@ signals:
 
     void positionChanged();
     void sizeChanged();
-    void ratationChanged();
+    void rotationChanged();
 
     void mashChanged();
 
@@ -217,7 +217,7 @@ private:
 
     QVector3D _position;
     QVector3D _size;
-    QQuaternion _ratation;
+    QQuaternion _rotation;
     QString _mash;
     QString _className;
     bool _visible = true;
diff --git a/src/Core/Crawl/iworld.cpp b/src/Core/Crawl/iworld.cpp
index b991e52..995c55d 100644
--- a/src/Core/Crawl/iworld.cpp
+++ b/src/Core/Crawl/iworld.cpp
@@ -353,15 +353,15 @@ void IWorld::updateWorld() {
     }
 }
 
-const QQuaternion &IWorld::cameraRatation() const {
-    return _cameraRatation;
+const QQuaternion &IWorld::cameraRotation() const {
+    return _cameraRotation;
 }
 
-void IWorld::setCameraRatation(const QQuaternion &newCameraRatation) {
-    if (_cameraRatation == newCameraRatation)
+void IWorld::setCameraRotation(const QQuaternion &newCameraRotation) {
+    if (_cameraRotation == newCameraRotation)
         return;
-    _cameraRatation = newCameraRatation;
-    emit cameraRatationChanged();
+    _cameraRotation = newCameraRotation;
+    emit cameraRotationChanged();
 }
 
 IAI *IWorld::backgroundAI() const {
diff --git a/src/Core/Crawl/iworld.h b/src/Core/Crawl/iworld.h
index d6e0384..f6559f8 100644
--- a/src/Core/Crawl/iworld.h
+++ b/src/Core/Crawl/iworld.h
@@ -49,7 +49,7 @@ class CRAWL_EXPORT IWorld : public QObject, public IRender
 {
     Q_OBJECT
     Q_PROPERTY(QVector3D cameraReleativePosition READ cameraReleativePosition NOTIFY cameraReleativePositionChanged)
-    Q_PROPERTY(QQuaternion cameraRatation READ cameraRatation NOTIFY cameraRatationChanged)
+    Q_PROPERTY(QQuaternion cameraRotation READ cameraRotation NOTIFY cameraRotationChanged)
     Q_PROPERTY(QObject * player READ player WRITE setPlayer NOTIFY playerChanged)
     Q_PROPERTY(QString hdr READ hdr NOTIFY hdrChanged)
 
@@ -210,10 +210,10 @@ public:
     IAI *backgroundAI() const;
 
     /**
-     * @brief cameraRatation This method return curent camera ratation.
-     * @return Quaternion of camera ratation
+     * @brief cameraRotation This method return curent camera rotation.
+     * @return Quaternion of camera rotation
      */
-    const QQuaternion &cameraRatation() const;
+    const QQuaternion &cameraRotation() const;
 
     /**
      * @brief player This method return player object
@@ -263,9 +263,9 @@ signals:
     void worldStatusChanged();
 
     /**
-     * @brief cameraRatationChanged This method emited when ratation of the camera cahnged
+     * @brief cameraRotationChanged This method emited when rotation of the camera cahnged
      */
-    void cameraRatationChanged();
+    void cameraRotationChanged();
 
     /**
      * @brief playerChanged This signal eited when player are changed.
@@ -320,10 +320,10 @@ protected:
     void setCameraReleativePosition(const QVector3D &newCameraReleativePosition);
 
     /**
-     * @brief setCameraRatation This method sets new ratation of the camera.
-     * @param newCameraRatation new ratation of the camera.
+     * @brief setCameraRotation This method sets new rotation of the camera.
+     * @param newCameraRotation new rotation of the camera.
      */
-    void setCameraRatation(const QQuaternion &newCameraRatation);
+    void setCameraRotation(const QQuaternion &newCameraRotation);
 
     /**
      * @brief targetFps This method return current targetFps;
@@ -488,7 +488,7 @@ private:
     mutable QMutex _ItemsMutex;
 
     QVector3D _cameraReleativePosition;
-    QQuaternion _cameraRatation;
+    QQuaternion _cameraRotation;
 
     QString _hdrMap;
     WorldRule *_worldRules = nullptr;
diff --git a/src/Core/Crawl/snakeitem.cpp b/src/Core/Crawl/snakeitem.cpp
index e3b39e3..65ce3ef 100644
--- a/src/Core/Crawl/snakeitem.cpp
+++ b/src/Core/Crawl/snakeitem.cpp
@@ -27,15 +27,15 @@ void SnakeItem::render(unsigned int tbfMsec) {
         return;
     }
 
-    auto ratationVector = (_prevObject->position() - position());
+    auto rotationVector = (_prevObject->position() - position());
 
     if (auto claster = static_cast<Snake*>(parentClaster())) {
-        float ratationLength = ratationVector.length();
+        float rotationLength = rotationVector.length();
 
-        if (ratationLength > lengthBetwinItems() * 10) {
+        if (rotationLength > lengthBetwinItems() * 10) {
             setposition(_prevObject->position());
-        } else if (ratationLength > lengthBetwinItems()) {
-            setMovableVector(ratationVector.normalized() * claster->currentMovableVector().length());
+        } else if (rotationLength > lengthBetwinItems()) {
+            setMovableVector(rotationVector.normalized() * claster->currentMovableVector().length());
         }
     }
 
diff --git a/src/Core/CrawlModule/DayLight.qml b/src/Core/CrawlModule/DayLight.qml
index 550a8d4..5fe77b8 100644
--- a/src/Core/CrawlModule/DayLight.qml
+++ b/src/Core/CrawlModule/DayLight.qml
@@ -34,7 +34,7 @@ Node {
         }
     }
 
-    rotation: (model)? model.ratation: Qt.quaternion(0, 0, 0, 0)
+    rotation: (model)? model.rotation: Qt.quaternion(0, 0, 0, 0)
     scale: (model)? model.size: Qt.vector3d(0, 0, 0);
     position: (model) ? model.position: Qt.vector3d(0,0,0);
     visible: sun.brightness
diff --git a/src/Core/CrawlModule/GraphicItem.qml b/src/Core/CrawlModule/GraphicItem.qml
index 0a447d1..af312be 100644
--- a/src/Core/CrawlModule/GraphicItem.qml
+++ b/src/Core/CrawlModule/GraphicItem.qml
@@ -65,7 +65,7 @@ Model {
         (fMapColor)? objMaterial: defaultMaterial
     ]
 
-    rotation: (model)? model.ratation: Qt.quaternion(0, 0, 0, 0)
+    rotation: (model)? model.rotation: Qt.quaternion(0, 0, 0, 0)
     scale: (model)? model.size: Qt.vector3d(0, 0, 0);
     source: (model)? model.mash: "#Cube";
     position: (model) ? model.position: Qt.vector3d(0,0,0);
diff --git a/src/Core/CrawlModule/Light.qml b/src/Core/CrawlModule/Light.qml
index 4bc1d45..fbaec42 100644
--- a/src/Core/CrawlModule/Light.qml
+++ b/src/Core/CrawlModule/Light.qml
@@ -26,7 +26,7 @@ Node {
 
     }
 
-    rotation: (model)? model.ratation: Qt.quaternion(0, 0, 0, 0)
+    rotation: (model)? model.rotation: Qt.quaternion(0, 0, 0, 0)
     scale: (model)? model.size: Qt.vector3d(0, 0, 0);
     position: (model) ? model.position: Qt.vector3d(0,0,0);
 
diff --git a/src/Core/CrawlModule/Scene.qml b/src/Core/CrawlModule/Scene.qml
index 346e06c..c0eadf7 100644
--- a/src/Core/CrawlModule/Scene.qml
+++ b/src/Core/CrawlModule/Scene.qml
@@ -23,7 +23,7 @@ View3D {
                           :
                       Qt.vector3d(0,0,100)
 
-        rotation: (privateRoot.world)? privateRoot.world.cameraRatation: Qt.quaternion(0,0,0,0)
+        rotation: (privateRoot.world)? privateRoot.world.cameraRotation: Qt.quaternion(0,0,0,0)
 
     }
 
diff --git a/src/Core/Extensions/basemotion.cpp b/src/Core/Extensions/basemotion.cpp
index 2e7704c..14458b2 100644
--- a/src/Core/Extensions/basemotion.cpp
+++ b/src/Core/Extensions/basemotion.cpp
@@ -26,7 +26,7 @@ void BaseMotion::setStaticRotation(const QQuaternion &newStaticRotation) {
 void BaseMotion::render(unsigned int tbfMsec) {
     if (auto _this = checkminimumRequariedType<GuiObject>()) {
         renderPosition(_this, tbfMsec);
-        renderRatation(_this, tbfMsec);
+        renderRotation(_this, tbfMsec);
     }
 }
 }
diff --git a/src/Core/Extensions/basemotion.h b/src/Core/Extensions/basemotion.h
index 73d0b50..2752458 100644
--- a/src/Core/Extensions/basemotion.h
+++ b/src/Core/Extensions/basemotion.h
@@ -21,7 +21,7 @@ class GuiObject;
  * @brief The BaseMotion class contains base functions of the motion.
  * For Create your own motion alghoritm you need to override two methods:
  *  * renderPosition
- *  * renderRatation
+ *  * renderRotation
  */
 class CRAWL_EXPORT BaseMotion : public virtual IRender
 {
@@ -49,14 +49,14 @@ public:
 protected:
 
     /**
-     * @brief renderRatation This method recalc raration for an @a object. The Default do nothing.
+     * @brief renderRotation This method recalc raration for an @a object. The Default do nothing.
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
-    virtual void renderRatation(GuiObject* object, unsigned int tbfMsec) = 0;
+    virtual void renderRotation(GuiObject* object, unsigned int tbfMsec) = 0;
 
     /**
-     * @brief renderRatation This method recalc position for an @a object.
+     * @brief renderRotation This method recalc position for an @a object.
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
diff --git a/src/Core/Extensions/circularmotion.cpp b/src/Core/Extensions/circularmotion.cpp
index 733d08e..c52197b 100644
--- a/src/Core/Extensions/circularmotion.cpp
+++ b/src/Core/Extensions/circularmotion.cpp
@@ -20,7 +20,7 @@ void CircularMotion::render(unsigned int tbfMsec) {
 
     if (auto _this = checkminimumRequariedType<GuiObject>()) {
         renderPosition(_this, tbfMsec);
-        renderRatation(_this, tbfMsec);
+        renderRotation(_this, tbfMsec);
     }
 }
 
@@ -56,9 +56,9 @@ void CircularMotion::setAnglePosition(double newAngle) {
     _angle = newAngle;
 }
 
-void CircularMotion::renderRatation(GuiObject *object,
+void CircularMotion::renderRotation(GuiObject *object,
                                     unsigned int ) {
-    object->setRatation(QQuaternion::rotationTo({1.0f, 0.0, 0.0}, *_center) * staticRotation());
+    object->setRotation(QQuaternion::rotationTo({1.0f, 0.0, 0.0}, *_center) * staticRotation());
 }
 
 void CircularMotion::renderPosition(GuiObject *object,
diff --git a/src/Core/Extensions/circularmotion.h b/src/Core/Extensions/circularmotion.h
index ac78b01..7c6b7a7 100644
--- a/src/Core/Extensions/circularmotion.h
+++ b/src/Core/Extensions/circularmotion.h
@@ -80,14 +80,14 @@ public:
 protected:
 
     /**
-     * @brief renderRatation This method recalc raration for an @a object. The Default implementation rotate object to center.
+     * @brief renderRotation This method recalc raration for an @a object. The Default implementation rotate object to center.
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
-    void renderRatation(GuiObject* object, unsigned int) override;
+    void renderRotation(GuiObject* object, unsigned int) override;
 
     /**
-     * @brief renderRatation This method recalc position for an @a object. The Default implementation move the current object around center.
+     * @brief renderRotation This method recalc position for an @a object. The Default implementation move the current object around center.
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
diff --git a/src/Core/Extensions/movableobject.cpp b/src/Core/Extensions/movableobject.cpp
index 18cd5e4..2c42ad1 100644
--- a/src/Core/Extensions/movableobject.cpp
+++ b/src/Core/Extensions/movableobject.cpp
@@ -21,7 +21,7 @@ void MovableObject::render(unsigned int tbfMsec) {
 
     if (auto _this = checkminimumRequariedType<GuiObject>()) {
         renderPosition(_this, tbfMsec);
-        renderRatation(_this, tbfMsec);
+        renderRotation(_this, tbfMsec);
     }
 }
 
@@ -49,9 +49,9 @@ void MovableObject::setBreakingForce(float newBreakingForce) {
     _breakingForce = newBreakingForce;
 }
 
-void MovableObject::renderRatation(GuiObject *object, unsigned int) {
+void MovableObject::renderRotation(GuiObject *object, unsigned int) {
     if (_currentMovableVector.length() > 0) {
-        object->setRatation(QQuaternion::rotationTo({1.0f, 0.0, 0.0}, _currentMovableVector) * staticRotation());
+        object->setRotation(QQuaternion::rotationTo({1.0f, 0.0, 0.0}, _currentMovableVector) * staticRotation());
     }
 }
 
diff --git a/src/Core/Extensions/movableobject.h b/src/Core/Extensions/movableobject.h
index 0691c72..bd23bd6 100644
--- a/src/Core/Extensions/movableobject.h
+++ b/src/Core/Extensions/movableobject.h
@@ -89,14 +89,14 @@ public:
 protected:
 
     /**
-     * @brief renderRatation This method recalc raration for an @a object. The Default implementation converts movableVector to ratation of an @a object.
+     * @brief renderRotation This method recalc raration for an @a object. The Default implementation converts movableVector to rotation of an @a object.
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
-    void renderRatation(GuiObject* object, unsigned int tbfMsec) override;
+    void renderRotation(GuiObject* object, unsigned int tbfMsec) override;
 
     /**
-     * @brief renderRatation This method recalc position for an @a object. The Default implementation move the current movable vector to setts movable vector. For example if you invoke the MovableObject::setMovableVector method then object change current movable vector with spead MovableObject::angularVelocity. If you sets
+     * @brief renderRotation This method recalc position for an @a object. The Default implementation move the current movable vector to setts movable vector. For example if you invoke the MovableObject::setMovableVector method then object change current movable vector with spead MovableObject::angularVelocity. If you sets
      * @param object This is provessing object. Usually @a an object is casted pointer of this to GuiObject type.
      * @param tbfMsec This is time betwin frames argument. soame as in the IRender::render function.
      */
diff --git a/src/CrawlAbstractLvl/private/abslvlcontrol.h b/src/CrawlAbstractLvl/private/abslvlcontrol.h
index e44ff9f..875440e 100644
--- a/src/CrawlAbstractLvl/private/abslvlcontrol.h
+++ b/src/CrawlAbstractLvl/private/abslvlcontrol.h
@@ -12,7 +12,7 @@
 namespace AbstractLvl {
 
 /**
- * @brief The AbsLvlControl class This controll support custom camera-ratation functions.
+ * @brief The AbsLvlControl class This controll support custom camera-rotation functions.
  */
 class AbsLvlControl: public CRAWL::DefaultControl
 {
diff --git a/src/CrawlAbstractLvl/private/abslvlworld.cpp b/src/CrawlAbstractLvl/private/abslvlworld.cpp
index 2fd1def..0e286c9 100644
--- a/src/CrawlAbstractLvl/private/abslvlworld.cpp
+++ b/src/CrawlAbstractLvl/private/abslvlworld.cpp
@@ -20,7 +20,7 @@ namespace AbstractLvl {
 
 AbsLvlWorld::AbsLvlWorld() {
     setCameraReleativePosition({20,0,100});
-    setCameraRatation(QQuaternion::fromEulerAngles({0,0,0}));
+    setCameraRotation(QQuaternion::fromEulerAngles({0,0,0}));
 }
 
 CRAWL::IPlayer *AbsLvlWorld::initPlayer() const {
diff --git a/src/CrawlTestLvl/private/box.cpp b/src/CrawlTestLvl/private/box.cpp
index 491d739..1d49667 100644
--- a/src/CrawlTestLvl/private/box.cpp
+++ b/src/CrawlTestLvl/private/box.cpp
@@ -16,7 +16,7 @@ Box::Box(): IWorldItem("Box") {
     setSize({2,2,2});
     setColor(QColor::fromRgb(rand()).name());
 
-    setRatation(QQuaternion::fromEulerAngles(
+    setRotation(QQuaternion::fromEulerAngles(
                     rand() % 360 ,
                     rand() % 360,
                     rand() % 360));
diff --git a/src/CrawlTestLvl/private/testcontrol.h b/src/CrawlTestLvl/private/testcontrol.h
index 59a6fba..589f3b7 100644
--- a/src/CrawlTestLvl/private/testcontrol.h
+++ b/src/CrawlTestLvl/private/testcontrol.h
@@ -12,7 +12,7 @@
 namespace TestLvl {
 
 /**
- * @brief The TestControl class This controll support custom camera-ratation functions.
+ * @brief The TestControl class This controll support custom camera-rotation functions.
  */
 class TestControl: public CRAWL::DefaultControl
 {
diff --git a/src/CrawlTestLvl/private/world.cpp b/src/CrawlTestLvl/private/world.cpp
index 5ff8f03..5d45fad 100644
--- a/src/CrawlTestLvl/private/world.cpp
+++ b/src/CrawlTestLvl/private/world.cpp
@@ -22,7 +22,7 @@ namespace TestLvl {
 
 World::World() {
     setCameraReleativePosition({50,0,100});
-    setCameraRatation(QQuaternion::fromEulerAngles({0,0,0}));
+    setCameraRotation(QQuaternion::fromEulerAngles({0,0,0}));
 }
 
 CRAWL::WorldRule *World::initWorldRules() {
@@ -77,14 +77,14 @@ CRAWL::IAI *World::initBackGroundAI() const {
 }
 
 void World::handleXViewChanged(double dx) {
-    auto eilorRatation = cameraRatation().toEulerAngles();
-    eilorRatation.setX(eilorRatation.x() + dx);
-    setCameraRatation(QQuaternion::fromEulerAngles(eilorRatation));
+    auto eilorRotation = cameraRotation().toEulerAngles();
+    eilorRotation.setX(eilorRotation.x() + dx);
+    setCameraRotation(QQuaternion::fromEulerAngles(eilorRotation));
 }
 
 void World::handleYViewChanged(double dy) {
-    auto eilorRatation = cameraRatation().toEulerAngles();
-    eilorRatation.setY(eilorRatation.y() + dy );
-    setCameraRatation(QQuaternion::fromEulerAngles(eilorRatation));
+    auto eilorRotation = cameraRotation().toEulerAngles();
+    eilorRotation.setY(eilorRotation.y() + dy );
+    setCameraRotation(QQuaternion::fromEulerAngles(eilorRotation));
 }
 }
diff --git a/src/JungleLvl/private/egg.cpp b/src/JungleLvl/private/egg.cpp
index ed558e0..35f1485 100644
--- a/src/JungleLvl/private/egg.cpp
+++ b/src/JungleLvl/private/egg.cpp
@@ -18,7 +18,7 @@ Egg::Egg(const QString name): CRAWL::IWorldItem(name)
     setMash(mashes[rand() % mashes.size()]);
 
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void Egg::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/grees.cpp b/src/JungleLvl/private/grees.cpp
index d449234..67a2457 100644
--- a/src/JungleLvl/private/grees.cpp
+++ b/src/JungleLvl/private/grees.cpp
@@ -13,7 +13,7 @@ Grees::Grees(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
     setMash("qrc:/mesh/meshes/Plant/Grass.mesh");
     setBaseColorMap("qrc:/mesh/meshes/Plant/Grass_Base.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 
 }
 
diff --git a/src/JungleLvl/private/ivy.cpp b/src/JungleLvl/private/ivy.cpp
index e355dc8..34963ea 100644
--- a/src/JungleLvl/private/ivy.cpp
+++ b/src/JungleLvl/private/ivy.cpp
@@ -18,7 +18,7 @@ Ivy::Ivy(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
 
     setBaseColorMap("qrc:/mesh/meshes/Plant/Ivy_Base.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void Ivy::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/longgress.cpp b/src/JungleLvl/private/longgress.cpp
index b21c59c..06fc34b 100644
--- a/src/JungleLvl/private/longgress.cpp
+++ b/src/JungleLvl/private/longgress.cpp
@@ -12,7 +12,7 @@ LongGress::LongGress(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
     setMash("qrc:/mesh/meshes/Plant/Long_grass.mesh");
     setBaseColorMap("qrc:/mesh/meshes/Plant/LongGrass_Base.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void LongGress::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/plant.cpp b/src/JungleLvl/private/plant.cpp
index 909555b..d95ee8b 100644
--- a/src/JungleLvl/private/plant.cpp
+++ b/src/JungleLvl/private/plant.cpp
@@ -20,7 +20,7 @@ Plant::Plant(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
 
     setBaseColorMap("qrc:/mesh/meshes/Plant/Plant_Base.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void Plant::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/stone.cpp b/src/JungleLvl/private/stone.cpp
index b20a37a..b822f5f 100644
--- a/src/JungleLvl/private/stone.cpp
+++ b/src/JungleLvl/private/stone.cpp
@@ -25,7 +25,7 @@ Stone::Stone(): CRAWL::IWorldItem(AUTO_CLASS_NAME)
     setNormalMap("qrc:/mesh/meshes/Stone/Stone_Normal.jpg");
 
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void Stone::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/tree.cpp b/src/JungleLvl/private/tree.cpp
index 50647be..5e6fa45 100644
--- a/src/JungleLvl/private/tree.cpp
+++ b/src/JungleLvl/private/tree.cpp
@@ -23,7 +23,7 @@ Tree::Tree(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
     setMash(mashes[rand() % mashes.size()]);
     setBaseColorMap("qrc:/mesh/meshes/Plant/Tree_Base.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({static_cast<float>(rand() % 60 - 30),
+    setRotation(QQuaternion::fromEulerAngles({static_cast<float>(rand() % 60 - 30),
                                               static_cast<float>(rand() % 60 - 30),
                                               static_cast<float>(rand() % 360)}));
 
diff --git a/src/JungleLvl/private/wood.cpp b/src/JungleLvl/private/wood.cpp
index 8b1906a..fea73ed 100644
--- a/src/JungleLvl/private/wood.cpp
+++ b/src/JungleLvl/private/wood.cpp
@@ -28,7 +28,7 @@ Wood::Wood(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
     setNormalMap("qrc:/mesh/meshes/Wood/Wood_Normal.jpg");
     setRoughnessMap("qrc:/mesh/meshes/Wood/Wood_Roughness.jpg");
     setSize({1,1,1});
-    setRatation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
+    setRotation(QQuaternion::fromEulerAngles({0,0, static_cast<float>(rand() % 360)}));
 }
 
 void Wood::onIntersects(const IWorldItem *) {
diff --git a/src/JungleLvl/private/world.cpp b/src/JungleLvl/private/world.cpp
index 8a462ba..62db223 100644
--- a/src/JungleLvl/private/world.cpp
+++ b/src/JungleLvl/private/world.cpp
@@ -30,7 +30,7 @@ namespace JungleLvl {
 
 World::World() {
     setCameraReleativePosition({50,0,100});
-    setCameraRatation(QQuaternion::fromEulerAngles({0,0,0}));
+    setCameraRotation(QQuaternion::fromEulerAngles({0,0,0}));
 }
 
 CRAWL::WorldRule *World::initWorldRules() {
@@ -117,15 +117,15 @@ CRAWL::IAI *World::initBackGroundAI() const {
 }
 
 void World::handleXViewChanged(double dx) {
-    auto eilorRatation = cameraRatation().toEulerAngles();
-    eilorRatation.setX(eilorRatation.x() + dx);
-    setCameraRatation(QQuaternion::fromEulerAngles(eilorRatation));
+    auto eilorRotation = cameraRotation().toEulerAngles();
+    eilorRotation.setX(eilorRotation.x() + dx);
+    setCameraRotation(QQuaternion::fromEulerAngles(eilorRotation));
 }
 
 void World::handleYViewChanged(double dy) {
-    auto eilorRatation = cameraRatation().toEulerAngles();
-    eilorRatation.setY(eilorRatation.y() + dy );
-    setCameraRatation(QQuaternion::fromEulerAngles(eilorRatation));
+    auto eilorRotation = cameraRotation().toEulerAngles();
+    eilorRotation.setY(eilorRotation.y() + dy );
+    setCameraRotation(QQuaternion::fromEulerAngles(eilorRotation));
 }
 
 }
diff --git a/tests/tstMain.cpp b/tests/tstMain.cpp
index fca3ef9..9645aaa 100644
--- a/tests/tstMain.cpp
+++ b/tests/tstMain.cpp
@@ -7,6 +7,7 @@
 
 #include <QtTest>
 #include "clasterstest.h"
+#include "groupobjecttest.h"
 
 // Use This macros for initialize your own test classes.
 // Check exampletests
@@ -33,6 +34,7 @@ private slots:
 
     // BEGIN TESTS CASES
     TestCase(clastersTest, ClastersTest)
+    TestCase(groupObjectTest, GroupObjectTest)
 
     // END TEST CASES
 
diff --git a/tests/units/groupobjecttest.cpp b/tests/units/groupobjecttest.cpp
new file mode 100644
index 0000000..c79f31d
--- /dev/null
+++ b/tests/units/groupobjecttest.cpp
@@ -0,0 +1,95 @@
+//#
+//# Copyright (C) 2021-2021 QuasarApp.
+//# Distributed under the GPLv3 software license, see the accompanying
+//# Everyone is permitted to copy and distribute verbatim copies
+//# of this license document, but changing it is not allowed.
+//#
+
+
+#include "groupobjecttest.h"
+#include "Crawl/groupobject.h"
+
+#include <Crawl/clasteritem.h>
+
+class TestGroupObject: public CRAWL::IWorldItem, public CRAWL::GroupObject {
+
+public:
+
+    // IWorldItem interface
+    TestGroupObject(): CRAWL::IWorldItem(AUTO_CLASS_NAME) {
+
+    }
+protected:
+    void onIntersects(const IWorldItem *) override {};
+
+    // IRender interface
+    void render(unsigned int tbfMsec) override {
+        GroupObject::render(tbfMsec);
+    };
+
+    void init() override {};
+
+    friend  GroupObjectTest;
+};
+
+class TestGroupObjectItem: public CRAWL::ClasterItem {
+
+public:
+    // IWorldItem interface
+
+    TestGroupObjectItem(): CRAWL::ClasterItem(AUTO_CLASS_NAME) {
+
+    }
+protected:
+    void onIntersects(const IWorldItem *) override {};
+};
+
+GroupObjectTest::GroupObjectTest() {
+
+}
+
+void GroupObjectTest::test() {
+    testBehavior();
+}
+
+void GroupObjectTest::testBehavior() const {
+    TestGroupObject object;
+    TestGroupObjectItem item;
+
+    object.setposition({100, 100, 0});
+    object.setRotation(QQuaternion::fromEulerAngles(100,0,0));
+
+    object.installObject(&item);
+
+    // check if added object after install into claster or not
+    QVERIFY(object.objects().size() == 1);
+
+    // The rotation and position of the main and child classes should be defferent
+    QVERIFY(item.position() != object.position());
+    QVERIFY(item.rotation() != object.rotation());
+
+    object.render(0);
+
+    // after invoke the render function all positions and rotations should be changed
+    QVERIFY(item.position() == object.position());
+    QVERIFY(item.rotation() == object.rotation());
+
+    QVector3D localPosition = {10,0,0};
+    QQuaternion localRotation = QQuaternion::fromEulerAngles(0,5,0);
+
+    object.updatePosition(item.guiId(), localPosition);
+    object.updateRotation(item.guiId(), localRotation);
+
+    object.render(0);
+
+    // after invoke the render function all positions and rotations should be changed
+    QVERIFY(item.position() == (object.position() + localPosition));
+    QVERIFY(item.rotation() == (object.rotation() * localRotation));
+
+
+    object.remove(&item);
+
+    QVERIFY(object.objects().size() == 0);
+
+
+}
diff --git a/tests/units/groupobjecttest.h b/tests/units/groupobjecttest.h
new file mode 100644
index 0000000..04b9efa
--- /dev/null
+++ b/tests/units/groupobjecttest.h
@@ -0,0 +1,31 @@
+//#
+//# Copyright (C) 2021-2021 QuasarApp.
+//# Distributed under the GPLv3 software license, see the accompanying
+//# Everyone is permitted to copy and distribute verbatim copies
+//# of this license document, but changing it is not allowed.
+//#
+
+#include "test.h"
+#include "testutils.h"
+
+
+#ifndef GROUPOBJECTTEST_H
+#define GROUPOBJECTTEST_H
+
+/**
+ * @brief The GroupObjectTest class will be tests the CRAWL::GroupObject class from the core library.
+ */
+class GroupObjectTest: public Test, protected TestUtils
+{
+public:
+    GroupObjectTest();
+    void test();
+
+private:
+    /**
+     * @brief testBehavior This method check the install objects on the main object.
+     */
+    void testBehavior() const;
+};
+
+#endif // GROUPOBJECTTEST_H
diff --git a/tests/units/test.h b/tests/units/test.h
index 6ff83d9..bd677f3 100644
--- a/tests/units/test.h
+++ b/tests/units/test.h
@@ -5,6 +5,7 @@
 //# of this license document, but changing it is not allowed.
 //#
 
+#include <QtTest>
 
 #ifndef TEST_H
 #define TEST_H