diff --git a/Apps/Examples/viewer.cpp b/Apps/Examples/viewer.cpp
index 701e1916de23da6a5bad9284146a9b88b168246f..df7f78567bb894c468b6657646952d913293a16e 100644
--- a/Apps/Examples/viewer.cpp
+++ b/Apps/Examples/viewer.cpp
@@ -113,6 +113,7 @@ void Viewer::cb_initGL()
 	m_simpleColorShader->setColor(c) ;
 
 	m_pointSprite = new Utils::PointSprite() ;
+	m_pointSprite->setAttributePosition(m_positionVBO) ;
 
 	registerShader(m_phongShader) ;
 	registerShader(m_flatShader) ;
@@ -126,7 +127,6 @@ void Viewer::cb_redraw()
 	if(m_drawVertices)
 	{
 		float size = vertexScaleFactor ;
-		m_pointSprite->setAttributePosition(m_positionVBO) ;
 		m_pointSprite->setSize(size) ;
 		m_pointSprite->predraw(Geom::Vec3f(0.0f, 0.0f, 1.0f)) ;
 		m_render->draw(m_pointSprite, Algo::Render::GL2::POINTS) ;
@@ -331,8 +331,6 @@ int main(int argc, char **argv)
 {
 	QApplication app(argc, argv) ;
 
-	srand(123) ;
-
 	Viewer sqt ;
 	sqt.setGeometry(0, 0, 1000, 800) ;
  	sqt.show() ;