diff --git a/README.md b/README.md
new file mode 100644
index 0000000..89affff
--- /dev/null
+++ b/README.md
@@ -0,0 +1,48 @@
+Pixel Wars is a programming game where two minimalistic civilizations
+will grow and try to annihilate each other to conquer the Pixel World. 
+But you don't have any real-time control over the action of your units.
+To be victorious, you'll have to code their behaviour in C/C++,
+and pray for a good result.
+
+This repository is the application project, it has severay dependencies :
+Qt5 modules: core gui widgets opengl, glm, SparrowRenderer, and cmake for the compilation
+
+### How to Use it from the precompiled builds (not available yet) :
+- download the latest build (insert links here)
+- unzip it anywhere
+- the PixelWars executable is located in the bin folder
+- you can now code your own Dude's behavior or map generator by
+placing in the respective "behaviors" and "generators" folder your compiled code
+in the form of a shared library, you can find an example in each folder named hello.cpp,
+containing the minimal code, the necessary includes,
+and the command line needed to compile it.
+
+### How to Build it from sources :
+
+download and install git, cmake, Qt5, and a c++ compiler (gcc on Unix or MinGW on Windows)
+
+get all required repositories :
+git clone https://git.epicsparrow.com/epicsparrow/CMakeTemplate.git
+git clone https://git.epicsparrow.com/epicsparrow/SparrowRenderer.git
+git clone https://git.epicsparrow.com/epicsparrow/PixelWars.git
+
+get all required dependencies,
+unzip this archive where you cloned the repositories :
+https://epicsparrow.com/media/libs/glm.zip
+
+you can now compile the sparrow renderer :
+- go in the SparrowRenderer folder
+- mkdir build
+- cd build
+- cmake ..
+- make
+
+after that, you'll be able to compile PixelWars :
+(same procedure)
+- go in the PixelWars folder
+- mkdir build
+- cd build
+- cmake ..
+- make
+
+That's it ! The PixelWars executable should have been generated in the build folder
diff --git a/teams/hello.cpp b/behaviors/hello.cpp
similarity index 100%
rename from teams/hello.cpp
rename to behaviors/hello.cpp
diff --git a/behaviors/hello.dll b/behaviors/hello.dll
new file mode 100644
index 0000000..d3f0b3a
Binary files /dev/null and b/behaviors/hello.dll differ
diff --git a/behaviors/hello1.dll b/behaviors/hello1.dll
new file mode 100644
index 0000000..d3f0b3a
Binary files /dev/null and b/behaviors/hello1.dll differ
diff --git a/behaviors/hello2.dll b/behaviors/hello2.dll
new file mode 100644
index 0000000..d3f0b3a
Binary files /dev/null and b/behaviors/hello2.dll differ
diff --git a/shaders/pixel.vert.glsl b/shaders/pixel.vert.glsl
index 79b97b0..39dfd04 100644
--- a/shaders/pixel.vert.glsl
+++ b/shaders/pixel.vert.glsl
@@ -10,5 +10,5 @@ out vec3 color;
 void main(void)
 {
     color = inColor;
-    gl_Position = vec4(inTexPosition.x*texRatio.x -1, inTexPosition.y*texRatio.y -1, 0.0, 1.0);
+    gl_Position = vec4(inTexPosition*texRatio -1, 0.0, 1.0);
 }
diff --git a/shaders/world.frag.glsl b/shaders/world.frag.glsl
index aeea090..84b6ef7 100644
--- a/shaders/world.frag.glsl
+++ b/shaders/world.frag.glsl
@@ -21,6 +21,7 @@ vec3 phongLighting(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 n
 
 void main()
 {
+    // looping the world in the shape of a toreiller (infinite flat surface)
     vec2 worldCoord = texCoord*worldSize + camera.xy*worldSize.y;
     ivec2 nbRevolutions = ivec2(floor(worldCoord / worldSize));
     if(abs(mod(nbRevolutions.y, 2)) > 0.5)
@@ -29,8 +30,9 @@ void main()
         nbRevolutions.x = int(floor(worldCoord.x / worldSize.x));
     }
     worldCoord = worldCoord - nbRevolutions*worldSize;
-    vec3 texColor = texelFetch(colorMap, ivec2(worldCoord)-1).xyz;
+    vec3 texColor = texelFetch(colorMap, ivec2(worldCoord)).xyz;
 
+    // computing lighting
     vec3 lighting = phongLighting(texColor, vec3(0.5), 50, vec3(1), normalize(normal), lightDir, normalize(lightDir+vec3(0, 0, -1)));
     outColor = vec4(texColor*0.2 + 0.8*lighting, 1.0);
 }
diff --git a/src/simulationdialog.cpp b/src/simulationdialog.cpp
index e7f5571..aef131d 100644
--- a/src/simulationdialog.cpp
+++ b/src/simulationdialog.cpp
@@ -16,17 +16,17 @@
 SimulationDialog::SimulationDialog(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::SimulationDialog),
-    m_map(NULL)
+    m_map(NULL),
+    m_availableGenerators(true)
 {
     ui->setupUi(this);
     connect(ui->behaviorsRefreshButton, SIGNAL(pressed()), this, SLOT(refreshBehaviors()));
     connect(ui->generatorsRefreshButton, SIGNAL(pressed()), this, SLOT(refreshGenerators()));
     connect(ui->generateButton, SIGNAL(pressed()), this, SLOT(generateMap()));
     connect(ui->behaviorsList, SIGNAL(clicked(QModelIndex)), this, SLOT(selectBehavior(QModelIndex)));
+    updatePreview();
     refreshBehaviors();
     refreshGenerators();
-    ui->generatorsList->setCurrentRow(0);
-    updatePreview();
 }
 
 SimulationDialog::~SimulationDialog()
@@ -48,7 +48,7 @@ void SimulationDialog::refreshBehaviors()
     m_selectedBehaviors.clear();
     ui->selectedBehaviors->clear();
     QDir teamDir(QCoreApplication::applicationDirPath());
-    if(teamDir.cd("../teams"))
+    if(teamDir.cd("../behaviors"))
     {
         for(const QFileInfo &info : teamDir.entryInfoList())
         {
@@ -100,15 +100,17 @@ void SimulationDialog::refreshGenerators()
     }
     else
         emit sendError(QString("ERROR : can't open the generators folder.\n"), 5000);
-    if(!m_genList.empty())
-        ui->generatorsList->item(0)->setSelected(true);
+    bool canGenerate = !m_genList.empty();
+    if(canGenerate)
+    {
+        ui->generatorsList->setCurrentRow(0);
+        generateMap();
+    }
+    ui->generateButton->setEnabled(canGenerate);
 }
 
 void SimulationDialog::generateMap()
 {
-    if(m_map != NULL)
-        delete m_map;
-    m_map = NULL;
     QString path = m_genList[ui->generatorsList->currentRow()];
     QLibrary lib(path);
     if(lib.load())
@@ -116,6 +118,9 @@ void SimulationDialog::generateMap()
         GenerateFunction func = (GenerateFunction)lib.resolve("generate");
         if(func)
         {
+            if(m_map != NULL)
+                delete m_map;
+            m_map = NULL;
             m_map = new MapScene(m_selectedBehaviors.size(), ui->mapSizeSpinBox->value());
             func((Map*)m_map);
             updatePreview();
diff --git a/src/simulationdialog.h b/src/simulationdialog.h
index 058e7e0..920b77a 100644
--- a/src/simulationdialog.h
+++ b/src/simulationdialog.h
@@ -41,6 +41,7 @@ private:
     std::vector<BehaviorFunction> m_selectedBehaviors;
     MapScene *m_map;
     QLibrary *m_currentGeneratorLib;
+    bool m_availableGenerators;
 
 signals:
     void sendError(QString, int);