diff --git a/apps/tutorials/pe/01_ConfinedGas.cpp b/apps/tutorials/pe/01_ConfinedGas.cpp
index 25efa73e85cee055e9815eb5f8ea5efdcaab8dd5..fe4616819faac48a1631792f37c892b5b69b008f 100644
--- a/apps/tutorials/pe/01_ConfinedGas.cpp
+++ b/apps/tutorials/pe/01_ConfinedGas.cpp
@@ -104,7 +104,7 @@ int main( int argc, char ** argv )
                      Color(real_t(0.4), real_t(0.4), real_t(0.4)));
    Raytracer raytracer(forest, storageID, globalBodyStorage, ccdID,
                        640, 480,
-                       real_t(49.13),
+                       real_t(49.13), 2,
                        Vec3(-25, 10, 10), Vec3(-5, 10, 10), Vec3(0, 0, 1),
                        lighting,
                        Color(real_t(0.1), real_t(0.1), real_t(0.1)),
diff --git a/apps/tutorials/pe/02_ConfinedGasExtended.cpp b/apps/tutorials/pe/02_ConfinedGasExtended.cpp
index cab90e259d127b499a2a667ae943b1334abbe71d..4ea95a8379095661e70a853ff79291090966aa83 100644
--- a/apps/tutorials/pe/02_ConfinedGasExtended.cpp
+++ b/apps/tutorials/pe/02_ConfinedGasExtended.cpp
@@ -157,7 +157,7 @@ int main( int argc, char ** argv )
                      Color(real_t(0.4), real_t(0.4), real_t(0.4)));
    Raytracer raytracer(forest, storageID, globalBodyStorage, ccdID,
                        640, 480,
-                       real_t(49.13),
+                       real_t(49.13), 2,
                        Vec3(-25, 10, 10), Vec3(-5, 10, 10), Vec3(0, 0, 1),
                        lighting,
                        Color(real_t(0.1), real_t(0.1), real_t(0.1)),