diff --git a/TODO b/TODO
index c5f342f..c88d762 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,5 @@
 Technology Preview 2 :
 - Finalize Preetham's model usage
-   => Add enumarate to choose model in formsky
    => Hide fields based on chosen model
    => Update all fields when "auto from daytime" is selected
    => Apply the skydome lighting by directly sampling it (no more amplitude in lights)
diff --git a/gui_qt/baseform.cpp b/gui_qt/baseform.cpp
index 27c9ac1..439b81b 100644
--- a/gui_qt/baseform.cpp
+++ b/gui_qt/baseform.cpp
@@ -8,6 +8,7 @@
 #include "inputnoise.h"
 #include "inputcurve.h"
 #include "inputmaterial.h"
+#include "inputenum.h"
 
 #include <QVBoxLayout>
 #include <QHBoxLayout>
@@ -264,6 +265,11 @@ void BaseForm::addInputMaterial(QString label, SurfaceMaterial* material)
     addInput(new InputMaterial(form, label, material));
 }
 
+void BaseForm::addInputEnum(QString label, int* value, const QStringList& values)
+{
+    addInput(new InputEnum(form, label, value, values));
+}
+
 int BaseForm::currentLayer()
 {
     if (with_layers)
diff --git a/gui_qt/baseform.h b/gui_qt/baseform.h
index 2e01630..d7bb5dc 100644
--- a/gui_qt/baseform.h
+++ b/gui_qt/baseform.h
@@ -46,6 +46,7 @@ protected:
     void addInputNoise(QString label, NoiseGenerator* value);
     void addInputCurve(QString label, Curve* value, double xmin, double xmax, double ymin, double ymax);
     void addInputMaterial(QString label, SurfaceMaterial* material);
+    void addInputEnum(QString label, int* value, const QStringList& values);
     
     int currentLayer();
     void setLayerCount(int layer_count);
diff --git a/gui_qt/formsky.cpp b/gui_qt/formsky.cpp
index ce1c0fe..0677115 100644
--- a/gui_qt/formsky.cpp
+++ b/gui_qt/formsky.cpp
@@ -104,6 +104,7 @@ FormSky::FormSky(QWidget *parent):
     previewEast = new PreviewSkyEast(this);
     addPreview(previewEast, QString(tr("East preview")));
 
+    addInputEnum(tr("Color model"), (int*)&_definition.model, QStringList(tr("Custom model")) << tr("Mixed Preetham/Shirley approximation"));
     addInputDouble(tr("Day time"), &_definition.daytime, 0.0, 1.0, 0.002, 0.1);
     addInputColor(tr("Sun color"), &_definition.sun_color);
     addInputDouble(tr("Sun radius"), &_definition.sun_radius, 0.0, 0.4, 0.004, 0.04);
diff --git a/gui_qt/inputenum.cpp b/gui_qt/inputenum.cpp
new file mode 100644
index 0000000..7745881
--- /dev/null
+++ b/gui_qt/inputenum.cpp
@@ -0,0 +1,29 @@
+#include "inputenum.h"
+
+#include <QLabel>
+#include <QComboBox>
+
+InputEnum::InputEnum(QWidget* form, QString label, int* value, const QStringList& values) : BaseInput(form, label)
+{
+    _value = value;
+    
+    _preview = new QWidget(form);
+    _control = new QComboBox(form);
+    ((QComboBox*)_control)->addItems(values);
+    
+    connect(_control, SIGNAL(currentIndexChanged(int)), this, SLOT(applyValue()));
+}
+
+void InputEnum::applyValue()
+{
+    *_value = ((QComboBox*)_control)->currentIndex();
+
+    BaseInput::applyValue();
+}
+
+void InputEnum::revert()
+{
+    ((QComboBox*)_control)->setCurrentIndex(*_value);
+
+    BaseInput::revert();
+}
diff --git a/gui_qt/inputenum.h b/gui_qt/inputenum.h
new file mode 100644
index 0000000..ef3747f
--- /dev/null
+++ b/gui_qt/inputenum.h
@@ -0,0 +1,23 @@
+#ifndef _PAYSAGES_QT_INPUTENUM_H_
+#define _PAYSAGES_QT_INPUTENUM_H_
+
+#include <QWidget>
+#include <QStringList>
+#include "baseinput.h"
+
+class InputEnum:public BaseInput
+{
+    Q_OBJECT
+
+public:
+    InputEnum(QWidget* form, QString label, int* value, const QStringList& values);
+
+public slots:
+    virtual void applyValue();
+    virtual void revert();
+
+private:
+    int* _value;
+};
+
+#endif
diff --git a/gui_qt/inputint.cpp b/gui_qt/inputint.cpp
index c6c3939..1e4d883 100644
--- a/gui_qt/inputint.cpp
+++ b/gui_qt/inputint.cpp
@@ -44,5 +44,5 @@ void InputInt::revert()
 {
     slider->setValue(*value);
 
-   BaseInput::revert();
+    BaseInput::revert();
 }
diff --git a/gui_qt/inputint.h b/gui_qt/inputint.h
index 759c705..7a32a03 100644
--- a/gui_qt/inputint.h
+++ b/gui_qt/inputint.h
@@ -26,4 +26,4 @@ private:
     int large_step;
 };
 
-#endif // _PAYSAGES_QT_INPUTINT_H_
+#endif
diff --git a/i18n/paysages_fr.ts b/i18n/paysages_fr.ts
index 77eb55d..0273327 100644
--- a/i18n/paysages_fr.ts
+++ b/i18n/paysages_fr.ts
@@ -4,32 +4,32 @@
 <context>
     <name>BaseForm</name>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="39"/>
+        <location filename="../gui_qt/baseform.cpp" line="40"/>
         <source>Layers : </source>
         <translation>Niveaux :</translation>
     </message>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="47"/>
+        <location filename="../gui_qt/baseform.cpp" line="48"/>
         <source>Add layer</source>
         <translation>Ajouter un niveau</translation>
     </message>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="51"/>
+        <location filename="../gui_qt/baseform.cpp" line="52"/>
         <source>Delete layer</source>
         <translation>Supprimer un niveau</translation>
     </message>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="87"/>
+        <location filename="../gui_qt/baseform.cpp" line="88"/>
         <source>Apply</source>
         <translation>Appliquer</translation>
     </message>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="90"/>
+        <location filename="../gui_qt/baseform.cpp" line="91"/>
         <source>Revert</source>
         <translation>Annuler les modifications</translation>
     </message>
     <message>
-        <location filename="../gui_qt/baseform.cpp" line="290"/>
+        <location filename="../gui_qt/baseform.cpp" line="296"/>
         <source>Layer %1</source>
         <translation>Niveau %1</translation>
     </message>
@@ -603,56 +603,71 @@ Maintenir Ctrl : Plus rapide</translation>
     </message>
     <message>
         <location filename="../gui_qt/formsky.cpp" line="107"/>
+        <source>Color model</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location filename="../gui_qt/formsky.cpp" line="107"/>
+        <source>Mixed Preetham/Shirley approximation</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location filename="../gui_qt/formsky.cpp" line="107"/>
+        <source>Custom model</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location filename="../gui_qt/formsky.cpp" line="108"/>
         <source>Day time</source>
         <translation>Heure du jour</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="108"/>
+        <location filename="../gui_qt/formsky.cpp" line="109"/>
         <source>Sun color</source>
         <translation>Couleur du soleil</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="109"/>
+        <location filename="../gui_qt/formsky.cpp" line="110"/>
         <source>Sun radius</source>
         <translation>Diamètre apparent du soleil</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="110"/>
+        <location filename="../gui_qt/formsky.cpp" line="111"/>
         <source>Sun halo radius</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="111"/>
+        <location filename="../gui_qt/formsky.cpp" line="112"/>
         <source>Sun halo profile</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="112"/>
+        <location filename="../gui_qt/formsky.cpp" line="113"/>
         <source>Auto from daytime</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="117"/>
+        <location filename="../gui_qt/formsky.cpp" line="118"/>
         <source>Turbidity</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="113"/>
+        <location filename="../gui_qt/formsky.cpp" line="114"/>
         <source>Zenith color</source>
         <translation>Couleur du ciel au zénith</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="114"/>
+        <location filename="../gui_qt/formsky.cpp" line="115"/>
         <source>Haze color</source>
         <translation>Couleur de la brume</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="115"/>
+        <location filename="../gui_qt/formsky.cpp" line="116"/>
         <source>Haze height</source>
         <translation>Hauteur apparente de la brume</translation>
     </message>
     <message>
-        <location filename="../gui_qt/formsky.cpp" line="116"/>
+        <location filename="../gui_qt/formsky.cpp" line="117"/>
         <source>Haze smoothing</source>
         <translation>Facteur de lissage de la brume</translation>
     </message>