diff --git a/src/render/software/CloudsRenderer.cpp b/src/render/software/CloudsRenderer.cpp
index 2159638..79df79f 100644
--- a/src/render/software/CloudsRenderer.cpp
+++ b/src/render/software/CloudsRenderer.cpp
@@ -11,6 +11,7 @@
 #include "clouds/BaseCloudsModel.h"
 #include "clouds/CloudModelAltoCumulus.h"
 #include "clouds/CloudModelCirrus.h"
+#include "clouds/CloudModelCumuloNimbus.h"
 #include "clouds/CloudModelStratoCumulus.h"
 
 CloudsRenderer::CloudsRenderer(SoftwareRenderer* parent):
@@ -62,26 +63,26 @@ void CloudsRenderer::update()
         BaseCloudsModel* model;
         switch (layer->type)
         {
-        case CloudLayerDefinition::STRATUS:
-        case CloudLayerDefinition::NIMBOSTRATUS:
-        case CloudLayerDefinition::CUMULUS:
-            model = new BaseCloudsModel(layer);
-            break;
         case CloudLayerDefinition::STRATOCUMULUS:
             model = new CloudModelStratoCumulus(layer);
             break;
         case CloudLayerDefinition::ALTOCUMULUS:
             model = new CloudModelAltoCumulus(layer);
             break;
-        case CloudLayerDefinition::ALTOSTRATUS:
+        case CloudLayerDefinition::CIRRUS:
+            model = new CloudModelCirrus(layer);
+            break;
         case CloudLayerDefinition::CUMULONIMBUS:
+            model = new CloudModelCumuloNimbus(layer);
+            break;
+        case CloudLayerDefinition::STRATUS:
+        case CloudLayerDefinition::NIMBOSTRATUS:
+        case CloudLayerDefinition::CUMULUS:
+        case CloudLayerDefinition::ALTOSTRATUS:
         case CloudLayerDefinition::CIRROCUMULUS:
         case CloudLayerDefinition::CIRROSTRATUS:
             model = new BaseCloudsModel(layer);
             break;
-        case CloudLayerDefinition::CIRRUS:
-            model = new CloudModelCirrus(layer);
-            break;
         }
 
         layer_models.push_back(model);
diff --git a/src/render/software/clouds/CloudModelCumuloNimbus.cpp b/src/render/software/clouds/CloudModelCumuloNimbus.cpp
new file mode 100644
index 0000000..0a43489
--- /dev/null
+++ b/src/render/software/clouds/CloudModelCumuloNimbus.cpp
@@ -0,0 +1,69 @@
+#include "CloudModelCumuloNimbus.h"
+
+#include "NoiseGenerator.h"
+#include "Vector3.h"
+#include "CloudLayerDefinition.h"
+
+CloudModelCumuloNimbus::CloudModelCumuloNimbus(CloudLayerDefinition* layer):
+    BaseCloudsModel(layer)
+{
+    noise = new NoiseGenerator();
+}
+
+CloudModelCumuloNimbus::~CloudModelCumuloNimbus()
+{
+    delete noise;
+}
+
+void CloudModelCumuloNimbus::update()
+{
+    noise->clearLevels();
+    noise->addLevelSimple(8.0, -1.0, 1.0);
+    noise->addLevelSimple(7.0 / 2.0, -0.6, 0.6);
+    noise->addLevelSimple(6.0 / 4.0, -0.3, 0.3);
+    noise->addLevelSimple(5.0 / 10.0, -0.15, 0.15);
+    /*noise->addLevelSimple(1.0 / 20.0, -0.09, 0.09);
+    noise->addLevelSimple(1.0 / 40.0, -0.06, 0.06);
+    noise->addLevelSimple(1.0 / 60.0, -0.03, 0.03);*/
+    noise->addLevelSimple(1.0 / 80.0, -0.015, 0.015);
+    noise->addLevelSimple(1.0 / 100.0, -0.06, 0.06);
+    noise->addLevelSimple(1.0 / 150.0, -0.015, 0.015);
+    noise->addLevelSimple(1.0 / 200.0, -0.009, 0.009);
+    noise->addLevelSimple(1.0 / 400.0, -0.024, 0.024);
+    noise->addLevelSimple(1.0 / 800.0, -0.003, 0.003);
+    noise->addLevelSimple(1.0 / 1000.0, -0.0015, 0.0015);
+    noise->normalizeAmplitude(-3.0, 4.0, 0);
+    noise->setState(layer->getNoiseState());
+}
+
+void CloudModelCumuloNimbus::getAltitudeRange(double *min_altitude, double *max_altitude) const
+{
+    *min_altitude = 5.0 + 10.0 * layer->altitude;
+    *max_altitude = *min_altitude + 50.0 + 50.0 * layer->scaling;
+}
+
+double CloudModelCumuloNimbus::getDensity(const Vector3 &location) const
+{
+    double val;
+    double min_altitude, max_altitude;
+    double noise_scaling = 60.0 * layer->scaling;
+
+    getAltitudeRange(&min_altitude, &max_altitude);
+
+    if (location.y < min_altitude || location.y > max_altitude)
+    {
+        return 0.0;
+    }
+    else
+    {
+        double x = 1.5 * location.x / noise_scaling;
+        double y = (location.y - min_altitude) / noise_scaling;
+        double z = 1.5 * location.z / noise_scaling;
+
+        //double coverage = layer->coverage * layer->_coverage_by_altitude->getValue((position.y - layer->altitude) / layer->scaling);
+        double coverage = layer->coverage;
+
+        val = 0.5 * noise->get3DTotal(x, y, z);
+        return val - 1.0 + coverage;
+    }
+}
diff --git a/src/render/software/clouds/CloudModelCumuloNimbus.h b/src/render/software/clouds/CloudModelCumuloNimbus.h
new file mode 100644
index 0000000..72d4f31
--- /dev/null
+++ b/src/render/software/clouds/CloudModelCumuloNimbus.h
@@ -0,0 +1,29 @@
+#ifndef CLOUDMODELCUMULONIMBUS_H
+#define CLOUDMODELCUMULONIMBUS_H
+
+#include "../software_global.h"
+
+#include "BaseCloudsModel.h"
+
+namespace paysages {
+namespace software {
+
+class CloudModelCumuloNimbus : public BaseCloudsModel
+{
+public:
+    CloudModelCumuloNimbus(CloudLayerDefinition* layer);
+    virtual ~CloudModelCumuloNimbus();
+
+    virtual void update() override;
+
+    virtual void getAltitudeRange(double *min_altitude, double *max_altitude) const override;
+    virtual double getDensity(const Vector3 &location) const override;
+
+private:
+    NoiseGenerator* noise;
+};
+
+}
+}
+
+#endif // CLOUDMODELCUMULONIMBUS_H
diff --git a/src/render/software/software.pro b/src/render/software/software.pro
index 959a4c8..dd41b16 100644
--- a/src/render/software/software.pro
+++ b/src/render/software/software.pro
@@ -39,7 +39,8 @@ SOURCES += SoftwareRenderer.cpp \
     NightSky.cpp \
     TerrainRayWalker.cpp \
     clouds/CloudModelAltoCumulus.cpp \
-    clouds/CloudModelCirrus.cpp
+    clouds/CloudModelCirrus.cpp \
+    clouds/CloudModelCumuloNimbus.cpp
 
 HEADERS += SoftwareRenderer.h\
         software_global.h \
@@ -68,7 +69,8 @@ HEADERS += SoftwareRenderer.h\
     NightSky.h \
     TerrainRayWalker.h \
     clouds/CloudModelAltoCumulus.h \
-    clouds/CloudModelCirrus.h
+    clouds/CloudModelCirrus.h \
+    clouds/CloudModelCumuloNimbus.h
 
 unix:!symbian {
     maemo5 {