diff --git a/src/main.cpp b/src/main.cpp
index a0c9be1..fff197d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -22,7 +22,6 @@ int main(int argc, char *argv[]) {
 					 [&]() {
 						 if (mesh_processor) {
 							 mesh_viewer->addMesh(mesh_processor->mesh);
-							 mesh_viewer->addMesh(mesh_processor->patch);
 						 }
 					 });
 
@@ -30,7 +29,9 @@ int main(int argc, char *argv[]) {
 		qWarning("Utilisation : %s [MAILLAGE]", argv[0]);
 		return 1;
 	} else if (argc == 2) {
-		mesh_processor = new MeshProcessor(argv[1]);
+		mesh_processor = new MeshProcessor(argv[1], *mesh_viewer);
+		QObject::connect(mesh_viewer, &MeshViewer::clicked,
+						 mesh_processor, &MeshProcessor::click);
 	}
 	QObject::connect(&main_window, &MainWindow::open,
 					 [&](const QString &path) {
@@ -38,8 +39,10 @@ int main(int argc, char *argv[]) {
 							 mesh_viewer->removeMesh(mesh_processor->mesh);
 							 delete mesh_processor;
 						 }
-						 mesh_processor = new MeshProcessor(path);
+						 mesh_processor = new MeshProcessor(path, *mesh_viewer);
 						 mesh_viewer->addMesh(mesh_processor->mesh);
+						 QObject::connect(mesh_viewer, &MeshViewer::clicked,
+										  mesh_processor, &MeshProcessor::click);
 					 });
 	main_window.show();
 	return app.exec();
diff --git a/src/main_window.cpp b/src/main_window.cpp
index ff8c68e..012e27a 100644
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -8,7 +8,7 @@
 MainWindow::MainWindow(QWidget *parent)
 	:QMainWindow(parent),
 	 toolbar(this),
-	 mesh_viewer(this) {
+	 mesh_viewer() {
 	connect(&mesh_viewer, &MeshViewer::initialized, [&]() {
 		open_action->setEnabled(true);
 	});
diff --git a/src/mesh_processor.cpp b/src/mesh_processor.cpp
index c4a1f46..c79e0dc 100644
--- a/src/mesh_processor.cpp
+++ b/src/mesh_processor.cpp
@@ -26,7 +26,8 @@ static std::vector<std::vector<HalfedgeHandle>> findHoles(MyMesh &mesh) {
 }
 
 
-MeshProcessor::MeshProcessor(const QString &path) {
+MeshProcessor::MeshProcessor(const QString &path, MeshViewer &mesh_viewer)
+	:mesh_viewer(mesh_viewer) {
 	OpenMesh::IO::Options options;
 	options.set(OpenMesh::IO::Options::VertexColor);
 	if (!OpenMesh::IO::read_mesh(mesh, path.toUtf8().constData(), options)) {
@@ -34,18 +35,20 @@ MeshProcessor::MeshProcessor(const QString &path) {
 		return;
 	}
 	mesh.update_normals();
-	Courbures courb(mesh);
-	courb.compute_KH();
-    courb.set_K_colors();
-	VertexHandle vh = mesh.vertex_handle(16);
-	QuadPatch q = mesh.property(courb.vprop_quad, vh);
-	patch = tesselate_quad_patch(q, mesh, vh);
+	courbure = new Courbures(mesh);
+	courbure->compute_KH();
+    courbure->set_K_colors();
 	// mesh.holes = findHoles(mesh);
 	// fillHoles();
 	// smooth(mesh);
 }
 
 
+MeshProcessor::~MeshProcessor() {
+	if (courbure) delete courbure;
+}
+
+
 void fillHoleDumb(MyMesh &mesh, std::vector<HalfedgeHandle> &hole) {
 	mesh.request_vertex_status();
 	mesh.request_edge_status();
@@ -68,8 +71,29 @@ void fillHoleDumb(MyMesh &mesh, std::vector<HalfedgeHandle> &hole) {
 	}
 }
 
+
 void MeshProcessor::fillHoles() {
 	for (auto hole : mesh.holes) {
 		fillHoleDumb(mesh, hole);
 	}
-}
\ No newline at end of file
+}
+
+
+void MeshProcessor::click(QVector3D position) {
+	Eigen::Vector3d pos {position.x(), position.y(), position.z()};
+	MyMesh::VertexIter it = mesh.vertices_begin();
+	VertexHandle min_vert = *it;
+	double min_dist = (mesh.point(*it) - pos).squaredNorm();
+	for (; it != mesh.vertices_end(); ++it) {
+		double dist = (mesh.point(*it) - pos).squaredNorm();
+		if (dist < min_dist) {
+			min_dist = dist;
+			min_vert = *it;
+		}
+	}
+	QuadPatch q = mesh.property(courbure->vprop_quad, min_vert);
+	patch = tesselate_quad_patch(q, mesh, min_vert);
+	mesh_viewer.removeMesh(patch);
+	mesh_viewer.addMesh(patch);
+	mesh_viewer.updateForReal();
+}
diff --git a/src/mesh_processor.h b/src/mesh_processor.h
index dd045a8..51d43ed 100644
--- a/src/mesh_processor.h
+++ b/src/mesh_processor.h
@@ -2,7 +2,9 @@
 #define MESH_PROCESSING_H
 
 #include "my_mesh.h"
+#include "curvature.h"
 #include "mesh_processor_painter.h"
+#include "mesh_viewer.h"
 #include <vector>
 #include <QObject>
 
@@ -10,14 +12,19 @@
 class MeshProcessor : public QObject {
 	Q_OBJECT
 
+	Courbures *courbure = nullptr;
+	MeshViewer &mesh_viewer;
+
 public:
 	MyMesh mesh;
 	MyMesh patch;
 
-	MeshProcessor(const QString &path);
+	MeshProcessor(const QString &path, MeshViewer &mesh_viewer);
+	~MeshProcessor();
 
 public slots:
 	void fillHoles();
+	void click(QVector3D position);
 };
 
 
diff --git a/src/mesh_viewer.cpp b/src/mesh_viewer.cpp
index 8662b65..6cf2a93 100644
--- a/src/mesh_viewer.cpp
+++ b/src/mesh_viewer.cpp
@@ -12,6 +12,11 @@ MeshViewer::MeshViewer(QWidget *parent) : QOpenGLWidget(parent) {
 }
 
 
+void MeshViewer::updateViewMatrix() {
+	view = trans * rot;
+}
+
+
 QSize MeshViewer::sizeHint() const {
 	return QSize(640, 480);
 }
@@ -64,17 +69,16 @@ void MeshViewer::initializeGL() {
 
 
 void MeshViewer::resizeGL(int w, int h) {
-	QMatrix4x4 projection;
-	projection.perspective(FOV, (float) w/h, .01, 100);
-	program.setUniformValue("proj", projection);
+	proj.setToIdentity();
+	proj.perspective(FOV, (float) w/h, .01, 100);
+	program.setUniformValue("proj", proj);
+	update();
 }
 
 
 void MeshViewer::paintGL() {
 	// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	QMatrix4x4 trans;
-	trans.translate(0, 0, -cam_dist);
-	QMatrix4x4 view = trans * rot;
 	program.bind();
 	program.setUniformValue("view", view);
 	for (MeshView &m : meshes) {
@@ -102,9 +106,34 @@ void MeshViewer::removeMesh(const MyMesh &mesh) {
 }
 
 
+void MeshViewer::updateForReal() {
+	qDebug() << "trying to update";
+	setEnabled(true);
+	setVisible(true);
+	update();
+	repaint();
+	makeCurrent();
+	paintGL();
+	doneCurrent();
+}
+
+
 void MeshViewer::mousePressEvent(QMouseEvent *e) {
 	if (e->button() == Qt::MiddleButton) {
 		mouse_pos = e->pos();
+	} else if (e->button() == Qt::LeftButton) {
+		float x = e->x();
+		float y = height() - e->y();
+		float depth;
+		makeCurrent();
+		QOpenGLFunctions *glf = context()->functions();
+		glf->glReadPixels(x, y, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth);
+		doneCurrent();
+		QVector3D position {x, y, depth};
+		position = position.unproject(view, proj, rect());
+		emit clicked(QVector3D(position));
+	} else {
+		e->ignore();
 	}
 }
 
@@ -121,12 +150,15 @@ void MeshViewer::mouseMoveEvent(QMouseEvent *e) {
 		rot = rot_start;
 		rot.rotate(delta.x() / 5., 0, 1, 0);
 		rot.rotate(delta.y() / 5., QVector3D(1, 0, 0) * rot);
+		updateViewMatrix();
 		update();
 	}
 }
 
 
 void MeshViewer::wheelEvent(QWheelEvent *e) {
-	cam_dist -= e->angleDelta().y() / 1000. * cam_dist;
+	trans(2, 3) -= e->angleDelta().y() / 1000. * trans(2, 3);
+	trans.optimize();
+	updateViewMatrix();
 	update();
 }
diff --git a/src/mesh_viewer.h b/src/mesh_viewer.h
index 3c7a94f..67a41ea 100644
--- a/src/mesh_viewer.h
+++ b/src/mesh_viewer.h
@@ -27,9 +27,14 @@ class MeshViewer : public QOpenGLWidget {
 	std::list<MeshView> meshes;
 	QOpenGLShaderProgram program;
 	QMatrix4x4 proj;
+	QMatrix4x4 trans = QMatrix4x4(1, 0, 0, 0,
+								  0, 1, 0, 0,
+								  0, 0, 1, -1,
+								  0, 0, 0, 1);
 	QMatrix4x4 rot, rot_start;
-	GLfloat cam_dist = 1;
+	QMatrix4x4 view = trans * rot;
 	QPoint mouse_pos;
+	void updateViewMatrix();
 
 public:
     MeshViewer(QWidget *parent=nullptr);
@@ -41,6 +46,7 @@ public:
 public slots:
 	void addMesh(const MyMesh &mesh);
 	void removeMesh(const MyMesh &mesh);
+	void updateForReal();
 
 protected:
     virtual void mousePressEvent(QMouseEvent *e);
@@ -50,6 +56,7 @@ protected:
 
 signals:
 	void initialized();
+	void clicked(QVector3D position);
 };