diff --git a/src/meshlabplugins/edit_scan/edit_scan.cpp b/src/meshlabplugins/edit_scan/edit_scan.cpp
index 8541836bf..fa88848d0 100644
--- a/src/meshlabplugins/edit_scan/edit_scan.cpp
+++ b/src/meshlabplugins/edit_scan/edit_scan.cpp
@@ -69,6 +69,7 @@ double randn(){
 bool VirtualScan::StartEdit(MeshDocument& md, GLArea* gla){
     assert(md.mm() != NULL); // Model exists
     this->md = &md;
+    this->gla = gla;
     gla->fov = 5; // Orthographic
     isScanning = false; // Trigger is off initially
     timer = 0;
@@ -80,10 +81,8 @@ bool VirtualScan::StartEdit(MeshDocument& md, GLArea* gla){
     widget = new Widget(gla->window());
     connect(widget, SIGNAL(laser_parameter_updated()),
             this, SLOT(laser_parameter_updated()));
-
-    // Redraw scene (to correct project/unproject) and initialize the scanner
-    gla->repaint();
-    this->laser_parameter_updated();
+    connect(widget, SIGNAL(scan_requested()),
+            this, SLOT(scan_requested()));
 
     return true;
 }
@@ -97,6 +96,7 @@ void VirtualScan::laser_parameter_updated(){
     qDebug("period: %d, samples: %d, width: %f", period, numsamp, width);
 
     //--- Create the geometry of the scanline
+    gla->update(); // since we use gluproject
     sline = ScanLine( numsamp, width );
     // sline = ScanLineGeom( 10, .1 ); // hardcoded parameters (GUI independent)
 
@@ -105,6 +105,9 @@ void VirtualScan::laser_parameter_updated(){
     timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(readytoscan()));
     timer->start(period); // period of repetition in ms
+
+    //--- Update the laser rendering
+    gla->update();
 }
 void VirtualScan::EndEdit(MeshModel &, GLArea* ){
     //--- Attempts to save the cloud in the layer (CRASH!)
@@ -118,6 +121,7 @@ void VirtualScan::EndEdit(MeshModel &, GLArea* ){
 
 // This is called only when mouse is pressed at first during a drag or a click is received
 void VirtualScan::mousePressEvent(QMouseEvent* e, MeshModel &, GLArea* gla){
+    this->laser_parameter_updated();
     gla->trackball.MouseDown(e->x(),gla->height()-e->y(), QT2VCG(e->button(), e->modifiers() ) );
     gla->update();
 }
@@ -135,7 +139,8 @@ void VirtualScan::Decorate(MeshModel& mm, GLArea* gla){
     // Scan the mesh only if we are triggering a scan and if the scanner is ready to suck in a new sample
     // This needs to be done after the mesh rendering has been done, but before any the scanned cloud is drawn!!
     if( isScanning && sampleReady ){
-        sampleReady = false; // We used the sample, jump to next one
+        sampleReady = false;
+        isScanning = false;
         scanpoints();
     }
 
@@ -143,7 +148,7 @@ void VirtualScan::Decorate(MeshModel& mm, GLArea* gla){
     glDisable(GL_LIGHTING);
         cloud->cm.C() = Color4b(255,200,200,255);
         glColor4f(.4f,.4f,1.f,.6f);
-        cloud->glw.SetHintParamf(GLW::HNPPointSize,5);
+        cloud->glw.SetHintParamf(GLW::HNPPointSize,SCANPOINTSIZE);
         cloud->Render(GLW::DMPoints, GLW::CMPerMesh, GLW::TMNone);
     glEnable(GL_LIGHTING);
 
@@ -174,7 +179,7 @@ ScanLine::ScanLine(int N, float width){
     Point2f sto = myGluProject(Point3f(+width/2,0,0));
     float delta = width/N;
     // qDebug() << "Scanpoint list: ";
-    for( float i=0; i<1; i+=delta ){
+    for( float i=0; i<=1; i+=delta ){
         if( N==1 )
             i = .5;
         Point2f curr = srt*(1-i) + sto*i;
@@ -182,6 +187,10 @@ ScanLine::ScanLine(int N, float width){
         // qDebug() << " - " << toString( curr );
         Point2i currI( curr[0], curr[1] );
         bbox.Add(currI);
+        // Invert samples and put them as close camera as possible
+        Point3f curr_o = myGluUnProject(curr,0.01);
+        soff_obj.push_back(curr_o);
+
         if( N==1 )
             break;
     }
@@ -224,6 +233,32 @@ void VirtualScan::scanpoints(){
     delete [] buffer;
 }
 void ScanLine::render(GLArea* gla){
+#if 0
+    //--- DEBUG! why mv[4,3] = -1000?
+    GLdouble mv[16];  glGetDoublev(GL_MODELVIEW_MATRIX, mv);
+    for(int i=0; i<4; i++)
+        qDebug() << mv[4*i+0] << " " << mv[4*i+1] << " " << mv[4*i+2] << " " << mv[4*i+3];
+    qDebug();
+#endif
+
+    // since image space drawing is not working, then
+    // draw in object space instead!
+    glPointSize(SCANPOINTSIZE);
+    glColor(Color4f(255,0,0,255));
+    glPushMatrix();
+        glLoadIdentity();
+        glBegin(GL_POINTS);
+            for(int i=0; i<soff_obj.size(); i++){
+                Point3f p = soff_obj[i];
+                // TODO: correction for the -1000 offset meshlab seems to put
+                p[2]-=1000;
+                glVertex(p);
+            }
+        glEnd();
+    glPopMatrix();
+
+// This draws directly in 2D image space
+#if 0
     // Attempts to render the scanline
     glDisable(GL_DEPTH_TEST);
     // Now draw some 2D stuff
@@ -237,6 +272,7 @@ void ScanLine::render(GLArea* gla){
         glLoadIdentity();
         glRectf(100,100, 200, 200);
     glPopMatrix();
+#endif
 }
 
 // Must be at the end of everything in CPP file or get segfault at plugin load
diff --git a/src/meshlabplugins/edit_scan/edit_scan.h b/src/meshlabplugins/edit_scan/edit_scan.h
index b6274cbd7..f32b2e7d2 100644
--- a/src/meshlabplugins/edit_scan/edit_scan.h
+++ b/src/meshlabplugins/edit_scan/edit_scan.h
@@ -9,10 +9,14 @@
 using namespace vcg;
 using namespace std;
 
+#define SCANPOINTSIZE 5
+
 class ScanLine{
 public:
     // Screen offsets of scan points
     vector<Point2f> soff;
+    // Object space locations (for rendering)
+    vector<Point3f> soff_obj;
     Box2i bbox;
     bool isScanning;
 
@@ -41,6 +45,8 @@ private:
     QTimer *timer;
     // The UI of the plugin
     Widget* widget;
+    // The parent
+    GLArea* gla;
 
 public slots:
     void laser_parameter_updated();
@@ -81,6 +87,11 @@ private:
 public slots:
     // called repeatedly by the timer
     void readytoscan(){ sampleReady = true; }
+    void scan_requested(){
+        isScanning = true;
+        sampleReady = true;
+        gla->update();
+    }
 };
 
 #endif
diff --git a/src/meshlabplugins/edit_scan/widget.h b/src/meshlabplugins/edit_scan/widget.h
index cf7f2b6bc..d913e9c97 100644
--- a/src/meshlabplugins/edit_scan/widget.h
+++ b/src/meshlabplugins/edit_scan/widget.h
@@ -10,15 +10,9 @@ namespace Ui {
 }
 
 // Defines the bounds (more than 1 object use them)
-#define MIN_SAMPFREQ 1
-#define MAX_SAMPFREQ 30
-#define DEF_SAMPFREQ 5
-#define MIN_SCANWIDTH 0
-#define MAX_SCANWIDTH 100
-#define DEF_SCANWIDTH 20
-#define MIN_NUMSAMPLE 2
-#define MAX_NUMSAMPLE 100
-#define DEF_NUMSAMPLE 10
+enum {MIN_SAMPFREQ   = 1,   MAX_SAMPFREQ   = 30,    DEF_SAMPFREQ   = 5};
+enum {MIN_SCANWIDTH  = 1,   MAX_SCANWIDTH  = 100,   DEF_SCANWIDTH  = 30};
+enum {MIN_NUMSAMPLE  = 2,   MAX_NUMSAMPLE  = 100,   DEF_NUMSAMPLE  = 10};
 
 class Widget : public QDockWidget {
     Q_OBJECT
@@ -49,6 +43,7 @@ public:
 
 signals:
     void laser_parameter_updated();
+    void scan_requested();
 
 private:
     Ui::Widget *ui;
@@ -84,16 +79,20 @@ private:
 
 private slots:
     void on_sbox_numsamples_valueChanged(int val){
-        numsample = qBound(MIN_SAMPFREQ,  val, MAX_SAMPFREQ);
+        numsample = qBound((int)MIN_NUMSAMPLE,  val, (int)MAX_NUMSAMPLE);
         emit laser_parameter_updated();
     }
     void on_sbox_width_valueChanged(int val){
-        scanwidth = qBound(MIN_SCANWIDTH, val, MAX_SCANWIDTH);
+        scanwidth = qBound((int)MIN_SCANWIDTH, val, (int)MAX_SCANWIDTH);
         emit laser_parameter_updated();
     }
     void on_sbox_freq_valueChanged(int val){
-        sampfreq  = qBound(MIN_NUMSAMPLE, val, MAX_NUMSAMPLE);
+        sampfreq  = qBound((int)MIN_SAMPFREQ, val, (int)MAX_SAMPFREQ);
         emit laser_parameter_updated();
     }
+    void on_scanbutton_released(){
+        emit laser_parameter_updated(); // just to be sure
+        emit scan_requested();
+    }
 };
 #endif // WIDGET_H
diff --git a/src/meshlabplugins/edit_scan/widget.ui b/src/meshlabplugins/edit_scan/widget.ui
index 6fbfc34bc..9f72874ca 100644
--- a/src/meshlabplugins/edit_scan/widget.ui
+++ b/src/meshlabplugins/edit_scan/widget.ui
@@ -21,6 +21,13 @@
   </property>
   <widget class="QWidget" name="dockWidgetContents">
    <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="QPushButton" name="scanbutton">
+      <property name="text">
+       <string>Scan (S)</string>
+      </property>
+     </widget>
+    </item>
     <item>
      <widget class="QGroupBox" name="box_freq">
       <property name="title">