diff --git a/src/scene/gui/scrollbarnode.cpp b/src/scene/gui/scrollbarnode.cpp
index 5aff377..ea8e7c1 100644
--- a/src/scene/gui/scrollbarnode.cpp
+++ b/src/scene/gui/scrollbarnode.cpp
@@ -29,27 +29,30 @@ ScrollBarNode::ScrollBarNode(glm::vec2 dimension, glm::vec3 bar_color):
     addChild(m_bar);
 }
 
+void ScrollBarNode::computeTransform()
+{
+    m_bar->resetTransform();
+    m_bar->moveTo2D(m_bar_position);
+    m_bar->resize2D(m_dimension, m_bar_dimension);
+}
+
 void ScrollBarNode::update()
 {
     GUINode::update();
+    bool needTransformUpdate = false;
     if(m_bar_resized)
     {
         if(m_total_size > m_bar_size){
-            m_bar->resetTransform();
             m_bar_dimension.y = m_dimension.y * ((float)m_bar_size / (float)m_total_size);
-            m_bar->resize2D(m_dimension,m_bar_dimension);
             m_bar_resized = false;
+            needTransformUpdate = true;
         }
     }
     if(m_bar_moved)
     {
         m_bar_position = glm::vec2(0,(m_dimension.y /m_total_size) * m_index_position);
-        std::cout<< "Pos vec: " << m_bar_position.x << " " << m_bar_position.y << std::endl;
-        m_bar->moveTo2D(m_bar_position);
-        glm::mat4 m = m_bar->getTransform();
-        glm::vec2 v = glm::vec2(m[3].x,m[3].y);
-        std::cout << "Pos tr : " << v.x << " " << v.y << std::endl;
         m_bar_moved = false;
+        needTransformUpdate = true;
     }
     if(m_bar_color_updated)
     {
@@ -57,6 +60,8 @@ void ScrollBarNode::update()
         mat->diffuse = m_bar_color;
         m_bar_color_updated = false;
     }
+    if(needTransformUpdate)
+        computeTransform();
 }
 
 glm::vec2 ScrollBarNode::getDimension()
diff --git a/src/scene/gui/scrollbarnode.h b/src/scene/gui/scrollbarnode.h
index 5aecd92..521f833 100644
--- a/src/scene/gui/scrollbarnode.h
+++ b/src/scene/gui/scrollbarnode.h
@@ -20,6 +20,9 @@ protected:
     MeshNode* m_bar;
     bool m_bar_resized;
     bool m_bar_moved;
+
+    void computeTransform();
+
 public:
     ScrollBarNode(glm::vec2 dimension,glm::vec3 bar_color);
     void update();
diff --git a/src/sparrowshell/sparrowshell.cpp b/src/sparrowshell/sparrowshell.cpp
index 320459f..0b57497 100644
--- a/src/sparrowshell/sparrowshell.cpp
+++ b/src/sparrowshell/sparrowshell.cpp
@@ -83,7 +83,6 @@ void SparrowShell::out(std::string str,glm::vec3 color)
     tnode->setDepth(SHELL_DEPTH+1);
     m_buffer->push(tnode);
     scrollDown();
-    std::cout << "size: " << m_buffer->size() << std::endl;
     if (m_buffer->size() > SparrowShell::BUFFER_DISPLAYED_LINES)
         m_resizeBuffer = true;
 }