diff --git a/example/Vulkan/AssimpLoaderMesh.cpp b/example/Vulkan/AssimpLoaderMesh.cpp
index 70415ce1..346d616b 100644
--- a/example/Vulkan/AssimpLoaderMesh.cpp
+++ b/example/Vulkan/AssimpLoaderMesh.cpp
@@ -200,8 +200,26 @@ public:
 
         GetBoundingBox(scene->mRootNode,&scene_min,&scene_max);
 
-        model_data->bounding_box.minPoint=pos_to_vec(scene_min);
-        model_data->bounding_box.maxPoint=pos_to_vec(scene_max);
+        float tmp;
+        vec smin=pos_to_vec(scene_min);
+        vec smax=pos_to_vec(scene_max);
+
+        if(smin.y>smax.y)
+        {
+            tmp=smin.y;
+            smin.y=smax.y;
+            smax.y=tmp;
+        }
+
+        if(smin.z>smax.z)
+        {
+            tmp=smin.z;
+            smin.z=smax.z;
+            smax.z=tmp;
+        }
+
+        model_data->bounding_box.minPoint=smin;
+        model_data->bounding_box.maxPoint=smax;
     }
 
     ~AssimpLoaderMesh()=default;
diff --git a/example/Vulkan/SceneTree.cpp b/example/Vulkan/SceneTree.cpp
index 33eda434..1d1c1d97 100644
--- a/example/Vulkan/SceneTree.cpp
+++ b/example/Vulkan/SceneTree.cpp
@@ -144,9 +144,6 @@ private:
                             scale((i+1)/100.0f));
         }
 
-        render_root.RefreshMatrix();
-        render_root.ExpendToList(&render_list);
-
         return(true);
     }
 
@@ -216,6 +213,7 @@ public:
         Matrix4f rot=rotate(GetDoubleTime()-start_time,camera.right_vector);
 
         render_root.RefreshMatrix(&rot);
+        render_list.Clear();
         render_root.ExpendToList(&render_list);
 
         BuildCommandBuffer();