diff --git a/code/nel/tools/3d/object_viewer_qt/src/entity.cpp b/code/nel/tools/3d/object_viewer_qt/src/entity.cpp
index 0f8a05b92..72ee5ee32 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/entity.cpp
+++ b/code/nel/tools/3d/object_viewer_qt/src/entity.cpp
@@ -25,9 +25,7 @@
 // NeL includes
 #include <nel/misc/path.h>
 #include <nel/3d/u_driver.h>
-#include <nel/3d/u_instance.h>
 #include <nel/3d/u_scene.h>
-#include <nel/3d/u_skeleton.h>
 #include <nel/3d/u_animation_set.h>
 #include <nel/3d/u_animation.h>
 #include <nel/3d/u_play_list_manager.h>
@@ -124,8 +122,10 @@ void CEntity::loadAnimation(std::string &fileName)
 	uint id = _AnimationSet->addAnimation(fileName.c_str(),CFile::getFilenameWithoutExtension(fileName).c_str());
 	_AnimationList.push_back(_AnimationSet->getAnimationName(id));
 	_AnimationSet->build();
-	if (!_Skeleton.empty()) _PlayList->registerTransform(_Skeleton);
-	else _PlayList->registerTransform(_Instance);
+	if (!_Skeleton.empty())
+		_PlayList->registerTransform(_Skeleton);
+	else
+		_PlayList->registerTransform(_Instance);
 }
 
 void CEntity::loadSWT(std::string &fileName)
diff --git a/code/nel/tools/3d/object_viewer_qt/src/object_viewer.h b/code/nel/tools/3d/object_viewer_qt/src/object_viewer.h
index b74544a3c..a7ea7fdc9 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/object_viewer.h
+++ b/code/nel/tools/3d/object_viewer_qt/src/object_viewer.h
@@ -39,9 +39,7 @@ namespace NL3D
 class UDriver;
 class UScene;
 class ULight;
-class UInstance;
 class UCamera;
-class USkeleton;
 class UTextContext;
 class UPlayListManager;
 class U3dMouseListener;
diff --git a/code/nel/tools/3d/object_viewer_qt/src/particle_control_form.ui b/code/nel/tools/3d/object_viewer_qt/src/particle_control_form.ui
index 69a76c963..11c19572d 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/particle_control_form.ui
+++ b/code/nel/tools/3d/object_viewer_qt/src/particle_control_form.ui
@@ -6,26 +6,26 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1101</width>
-    <height>121</height>
+    <width>1053</width>
+    <height>85</height>
    </rect>
   </property>
   <property name="sizePolicy">
-   <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
   </property>
   <property name="minimumSize">
    <size>
-    <width>950</width>
-    <height>121</height>
+    <width>896</width>
+    <height>85</height>
    </size>
   </property>
   <property name="maximumSize">
    <size>
     <width>524287</width>
-    <height>121</height>
+    <height>85</height>
    </size>
   </property>
   <property name="windowTitle">
@@ -39,8 +39,20 @@
     </sizepolicy>
    </property>
    <layout class="QGridLayout" name="gridLayout_5">
+    <property name="leftMargin">
+     <number>6</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>6</number>
+    </property>
     <property name="bottomMargin">
-     <number>9</number>
+     <number>0</number>
+    </property>
+    <property name="spacing">
+     <number>3</number>
     </property>
     <item row="0" column="0" rowspan="2">
      <widget class="QToolButton" name="playToolButton">
@@ -84,6 +96,9 @@
        <property name="margin">
         <number>0</number>
        </property>
+       <property name="spacing">
+        <number>3</number>
+       </property>
        <item row="0" column="0" rowspan="3">
         <widget class="QFrame" name="frame_2">
          <property name="frameShape">
@@ -93,6 +108,12 @@
           <enum>QFrame::Plain</enum>
          </property>
          <layout class="QGridLayout" name="gridLayout">
+          <property name="margin">
+           <number>0</number>
+          </property>
+          <property name="spacing">
+           <number>3</number>
+          </property>
           <item row="0" column="0" rowspan="2">
            <widget class="QStackedWidget" name="stackedWidget">
             <property name="sizePolicy">
@@ -102,12 +123,12 @@
              </sizepolicy>
             </property>
             <property name="currentIndex">
-             <number>1</number>
+             <number>0</number>
             </property>
             <widget class="QWidget" name="pageGeneral">
              <layout class="QGridLayout" name="gridLayout_2">
               <property name="margin">
-               <number>9</number>
+               <number>0</number>
               </property>
               <property name="spacing">
                <number>3</number>
@@ -200,6 +221,9 @@
               <property name="margin">
                <number>0</number>
               </property>
+              <property name="spacing">
+               <number>3</number>
+              </property>
               <item row="0" column="0">
                <widget class="QCheckBox" name="linkCheckBox">
                 <property name="enabled">
diff --git a/code/nel/tools/3d/object_viewer_qt/src/plugins/example/qnel_widget.cpp b/code/nel/tools/3d/object_viewer_qt/src/plugins/example/qnel_widget.cpp
index 7c2338de1..88d42c7b6 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/plugins/example/qnel_widget.cpp
+++ b/code/nel/tools/3d/object_viewer_qt/src/plugins/example/qnel_widget.cpp
@@ -84,6 +84,11 @@ void QNLWidget::setInterval(int msec)
 	m_mainTimer->setInterval(msec);
 }
 
+void QNLWidget::setBackgroundColor(NLMISC::CRGBA backgroundColor)
+{
+	m_backgroundColor = backgroundColor;
+}
+
 void QNLWidget::updateRender()
 {
 	if (isVisible())
@@ -101,7 +106,7 @@ void QNLWidget::updateRender()
 		if (m_initialized && !m_driver->isLost())
 		{
 			//_driver->activate();
-			m_driver->clearBuffers(NLMISC::CRGBA(125,12,58));
+			m_driver->clearBuffers(m_backgroundColor);
 			Q_EMIT updatePreRender();
 
 			Q_EMIT updatePostRender();