diff --git a/py_tutorials/csg_first_example.py b/py_tutorials/csg_first_example.py
index b8c95da6..5e42101a 100644
--- a/py_tutorials/csg_first_example.py
+++ b/py_tutorials/csg_first_example.py
@@ -1,12 +1,20 @@
 from netgen.csg import *
 import netgen.meshing as meshing
 
+from OpenGL.GL import *
+from OpenGL.GLU import *
+from OpenGL.GLUT import *
 
-sp1 = Sphere (Point3d(1,0,0), 1)
-sp2 = Sphere (Point3d(2,0,0), 1)
 
-both = Or(sp1, sp2)
-all = And (both, OrthoBrick ( Point3d(0,0,0), Point3d (3,0.5,1)))
+
+sp1 = Sphere (Pnt(0,0,0), 0.2)
+sp2 = Sphere (Pnt(0.5,0,0), 0.2)
+sp3 = Sphere (Pnt(0,0,0.5), 0.2)
+sp4 = Sphere (Pnt(0,0.2,0.7), 0.2)
+sp5 = Sphere (Pnt(0,0,0.3), 0.2)
+
+
+all = sp1+sp2+sp3+sp4+sp5
 
 
 geom = CSGeometry()
@@ -14,7 +22,57 @@ geom.Add (all)
 
 
 vis = VS(geom)
-vis.Draw()
+# vis.Draw()
+
+
+window = 0                                             # glut window number
+width, height = 500, 500
+
+
+
+def mydraw():
+
+    glViewport(0, 0, width, height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    
+    pnear = 0.1;
+    pfar = 10;
+
+    gluPerspective(20.0, 1.0*width / height, pnear, pfar);
+    glMatrixMode(GL_MODELVIEW);
+    
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+#    glLoadIdentity()
+#    gluLookAt (0, 0, 6, 0, 0, 0, 0, 1, 0);
+    
+##    glBegin(GL_QUADS)
+##    glColor4d(0.0, 1.0, 0.0, 0.0);
+##    glVertex3d(0.0,0.0,0.7)
+##    glVertex3d(1.0,0.0,2.1)
+##    glColor4d(1.0, 1.0, 1.0, 0.0);
+##    glVertex3d(1.0,1.0,0.2)
+##    glVertex3d(0.0,1.0,0.5)
+##    glEnd()
+     
+    vis.Draw()
+    
+    glutSwapBuffers()
+
+
+
+
+
+glutInit("mainwin")                                   # initialize glut
+glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
+glutInitWindowSize(width, height)                      # set window size
+glutInitWindowPosition(0, 0)                           # set window position
+window = glutCreateWindow(b"ngs")                      # create window with title
+#glutDisplayFunc(vis.Draw)                                 # set draw function callback
+glutIdleFunc(mydraw)                                     # draw all the time
+glutMainLoop()        
+
 
 
 # param = meshing.MeshingParameters(maxh=0.2)
diff --git a/py_tutorials/opengl.py b/py_tutorials/opengl.py
index d2238228..c5fad7b6 100644
--- a/py_tutorials/opengl.py
+++ b/py_tutorials/opengl.py
@@ -31,35 +31,10 @@ width, height = 500, 500
 
 
 def mydraw():
-
-    glViewport(0, 0, width, height);
-
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    
-    pnear = 0.1;
-    pfar = 10;
-
-    gluPerspective(20.0, 1.0*width / height, pnear, pfar);
-    glMatrixMode(GL_MODELVIEW);
-    
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
-#    glLoadIdentity()
-#    gluLookAt (0, 0, 6, 0, 0, 0, 0, 1, 0);
-    
-##    glBegin(GL_QUADS)
-##    glColor4d(0.0, 1.0, 0.0, 0.0);
-##    glVertex3d(0.0,0.0,0.7)
-##    glVertex3d(1.0,0.0,2.1)
-##    glColor4d(1.0, 1.0, 1.0, 0.0);
-##    glVertex3d(1.0,1.0,0.2)
-##    glVertex3d(0.0,1.0,0.5)
-##    glEnd()
-     
     vis.Draw()
-    
     glutSwapBuffers()
 
+
 xold = -1;
 yold = -1;
 mode = 'r'
@@ -69,6 +44,7 @@ def myMotionHandler( x, y ):
     MouseMove(vis,xold,yold, x,y, mode)  # 'm','z'
     xold = x
     yold = y
+    mydraw()
 
 def myPassiveMotionHandler( x, y ):
     global xold, yold
@@ -92,11 +68,25 @@ glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
 glutInitWindowSize(width, height)                      # set window size
 glutInitWindowPosition(0, 0)                           # set window position
 window = glutCreateWindow(b"ngs")                      # create window with title
+
 glutMotionFunc(myMotionHandler)
 glutMouseFunc(myMouseHandler)
 glutPassiveMotionFunc(myPassiveMotionHandler)
 glutDisplayFunc(mydraw)                                 # set draw function callback
-glutIdleFunc(mydraw)                                     # draw all the time
+# glutIdleFunc(mydraw)                                     # draw all the time
+
+
+
+glMatrixMode(GL_PROJECTION);
+glLoadIdentity();
+pnear = 0.1;
+pfar = 10;
+gluPerspective(20.0, 1.0*width / height, pnear, pfar);
+glViewport(0, 0, width, height);
+glMatrixMode(GL_MODELVIEW);
+
+
+
 glutMainLoop()