diff --git a/TODO b/TODO
index a7754c2..6455d68 100644
--- a/TODO
+++ b/TODO
@@ -17,7 +17,6 @@ Technology Preview 2 :
    => Improve curve rendering
    => Add axis labels
 - Improve 3d explorer
-   => Improve priority rendering (prioritize on screen chunks)
    => Restore LOD and intelligent poly count
    => Interrupt chunk rendering when quitting dialog
    => Don't display the water if it's below all ground
diff --git a/gui_qt/wandererchunk.cpp b/gui_qt/wandererchunk.cpp
index 0888c33..622bb10 100644
--- a/gui_qt/wandererchunk.cpp
+++ b/gui_qt/wandererchunk.cpp
@@ -5,6 +5,7 @@
 #include <QColor>
 #include <QGLWidget>
 #include <math.h>
+#include "../lib_paysages/camera.h"
 #include "../lib_paysages/color.h"
 #include "../lib_paysages/euclid.h"
 #include "../lib_paysages/tools.h"
@@ -17,8 +18,7 @@ WandererChunk::WandererChunk(Renderer* renderer, double x, double z, double size
     _startz = z;
     _size = size;
     
-    _ideal_tessellation = 1;
-    _ideal_priority = 0.0;
+    priority = 0.0;
     
     _tessellation_max_size = 32;
     _tessellation = new double[(_tessellation_max_size + 1) * (_tessellation_max_size + 1)];
@@ -82,31 +82,42 @@ void WandererChunk::render(QGLWidget* widget)
     }
 }
 
-void WandererChunk::updatePriority(Vector3 camera_location)
+void WandererChunk::updatePriority(CameraDefinition* camera)
 {
     // Compute new priority
     _lock_data.lock();
     if (_tessellation_current_size == _tessellation_max_size && _texture_current_size == _texture_max_size)
     {
-        _ideal_priority = -1000.0;
+        priority = -1000.0;
     }
     else
     {
-        double distance = v3Norm(v3Sub(camera_location, getCenter()));
+        double distance, wanted_size;
+        Vector3 center;
+        
+        center = getCenter();
+        
+        distance = v3Norm(v3Sub(camera->location, center));
         distance = distance < 0.1 ? 0.1 : distance;
-        _ideal_tessellation = (int)ceil(120.0 - distance / 3.0);
-        _ideal_priority = _ideal_tessellation - _texture_current_size;
+        wanted_size = (int)ceil(120.0 - distance / 3.0);
+        
+        priority = wanted_size - _texture_current_size;
         if (_texture_current_size == 1)
         {
-            _ideal_priority += 100.0;
+            priority += 100.0;
         }
         else if (distance < 15.0 && _texture_current_size < _texture_max_size)
         {
-            _ideal_priority += 75.0;
+            priority += 75.0;
         }
         else if (distance < 30.0 && _texture_current_size < _texture_max_size / 2)
         {
-            _ideal_priority += 50.0;
+            priority += 50.0;
+        }
+        
+        if (!cameraIsBoxInView(camera, center, _size, _size, 40.0))
+        {
+            priority -= 100.0;
         }
     }
     _lock_data.unlock();
diff --git a/gui_qt/wandererchunk.h b/gui_qt/wandererchunk.h
index a44a7ba..5f2bd21 100644
--- a/gui_qt/wandererchunk.h
+++ b/gui_qt/wandererchunk.h
@@ -13,12 +13,12 @@ public:
     ~WandererChunk();
     
     bool maintain();
-    void updatePriority(Vector3 camera_location);
+    void updatePriority(CameraDefinition* camera);
     void render(QGLWidget* widget);
     
     Vector3 getCenter();
     
-    double _ideal_priority;
+    double priority;
     
 private:
     QMutex _lock_data;
@@ -28,8 +28,6 @@ private:
     double _startz;
     double _size;
     
-    int _ideal_tessellation;
-    
     double* _tessellation;
     int _tessellation_max_size;
     int _tessellation_current_size;
diff --git a/gui_qt/widgetwanderer.cpp b/gui_qt/widgetwanderer.cpp
index f7b6cbd..d21d90d 100644
--- a/gui_qt/widgetwanderer.cpp
+++ b/gui_qt/widgetwanderer.cpp
@@ -169,7 +169,7 @@ void WidgetWanderer::stopThreads()
 
 bool _cmpChunks(const WandererChunk* c1, const WandererChunk* c2)
 {
-    return c1->_ideal_priority > c2->_ideal_priority;
+    return c1->priority > c2->priority;
 }
 
 void WidgetWanderer::performChunksMaintenance()
@@ -354,7 +354,7 @@ void WidgetWanderer::timerEvent(QTimerEvent *event)
     
     for (int i = 0; i < _chunks.count(); i++)
     {
-        _chunks[i]->updatePriority(_current_camera.location);
+        _chunks[i]->updatePriority(&_current_camera);
     }
     _lock_chunks.lock();
     qSort(_updateQueue.begin(), _updateQueue.end(), _cmpChunks);
diff --git a/lib_paysages/camera.c b/lib_paysages/camera.c
index f33aa16..eb26aac 100644
--- a/lib_paysages/camera.c
+++ b/lib_paysages/camera.c
@@ -2,6 +2,7 @@
 
 #include <stdlib.h>
 #include <math.h>
+#include <glib-2.0/glib/gmacros.h>
 #include "euclid.h"
 #include "render.h"
 #include "shared/types.h"
@@ -296,3 +297,56 @@ void cameraProjectToFragment(CameraDefinition* camera, Renderer* renderer, doubl
 
     renderPushQuad(&v1, &v2, &v3, &v4);
 }*/
+
+static inline void _updateBox(Vector3* point, double* xmin, double* xmax, double* ymin, double* ymax, double* zmax)
+{
+    *xmin = MIN(*xmax, point->x);
+    *xmax = MAX(*xmin, point->x);
+    *ymin = MIN(*ymax, point->y);
+    *ymax = MAX(*ymin, point->y);
+    *zmax = MAX(*zmax, point->z);
+}
+
+int cameraIsBoxInView(CameraDefinition* camera, Vector3 center, double xsize, double ysize, double zsize)
+{
+    Vector3 projected;
+    double xmin, xmax, ymin, ymax, zmax;
+    
+    center.x -= xsize / 2.0;
+    center.y -= ysize / 2.0;
+    center.z -= zsize / 2.0;
+    projected = cameraProject(camera, NULL, center);
+    xmin = xmax = projected.x;
+    ymin = ymax = projected.y;
+    zmax = projected.z;
+    
+    center.x += xsize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+
+    center.y += ysize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+
+    center.z += zsize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+
+    center.x -= xsize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+    
+    center.y -= ysize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+
+    center.x += xsize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+
+    center.z -= zsize;
+    projected = cameraProject(camera, NULL, center);
+    _updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
+    
+    return xmin <= camera->width && xmax >= 0.0 && ymin <= camera->height && ymax >= 0.0 && zmax >= camera->znear;
+}
diff --git a/lib_paysages/camera.h b/lib_paysages/camera.h
index 86ff0a0..be2caa3 100644
--- a/lib_paysages/camera.h
+++ b/lib_paysages/camera.h
@@ -36,7 +36,8 @@ Vector3 cameraProject(CameraDefinition* camera, Renderer* renderer, Vector3 poin
 Vector3 cameraUnproject(CameraDefinition* camera, Renderer* renderer, Vector3 point);
 void cameraProjectToFragment(CameraDefinition* camera, Renderer* renderer, double x, double y, double z, RenderFragment* result);
 /*void cameraPushOverlay(CameraDefinition* camera, Color col, f_RenderFragmentCallback callback);*/
-
+int cameraIsBoxInView(CameraDefinition* camera, Vector3 center, double xsize, double ysize, double zsize);
+        
 #ifdef __cplusplus
 }
 #endif