diff --git a/CMakeLists.txt b/CMakeLists.txt
index db933ee..f3b1699 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,7 @@ find_package(glfw3 CONFIG REQUIRED)
 find_package(glm CONFIG REQUIRED)
 find_package(Ktx CONFIG REQUIRED)
 find_package(imgui CONFIG REQUIRED)
+find_package(OpenMP REQUIRED)
 
 add_executable(RayTracer "")
 target_include_directories(RayTracer PUBLIC src/)
@@ -31,5 +32,6 @@ target_link_libraries(RayTracer PUBLIC GLEW::GLEW)
 target_link_libraries(RayTracer PUBLIC glm::glm)
 target_link_libraries(RayTracer PUBLIC KTX::ktx)
 target_link_libraries(RayTracer PUBLIC ${VCPKG_INSTALLED_DIR}/x64-windows/lib/slang.lib)
+target_link_libraries(RayTracer PUBLIC OpenMP::OpenMP_CXX)
 
 add_subdirectory(src/)
\ No newline at end of file
diff --git a/res/models/box.blend b/res/models/box.blend
new file mode 100644
index 0000000..0a08022
Binary files /dev/null and b/res/models/box.blend differ
diff --git a/res/models/box.blend1 b/res/models/box.blend1
new file mode 100644
index 0000000..5b80c73
Binary files /dev/null and b/res/models/box.blend1 differ
diff --git a/res/models/box.glb b/res/models/box.glb
new file mode 100644
index 0000000..16c894a
Binary files /dev/null and b/res/models/box.glb differ
diff --git a/res/models/couch_family_3seats _recamiere.blend b/res/models/couch_family_3seats _recamiere.blend
new file mode 100644
index 0000000..744ca69
Binary files /dev/null and b/res/models/couch_family_3seats _recamiere.blend differ
diff --git a/res/models/town_hall_interior.blend b/res/models/town_hall_interior.blend
new file mode 100644
index 0000000..d480842
Binary files /dev/null and b/res/models/town_hall_interior.blend differ
diff --git a/src/ThreadPool.h b/src/ThreadPool.h
index 9f079e4..3157980 100644
--- a/src/ThreadPool.h
+++ b/src/ThreadPool.h
@@ -13,7 +13,7 @@ struct Batch
 class ThreadPool
 {
 public:
-    ThreadPool(uint32_t numWorkers = std::thread::hardware_concurrency());
+    ThreadPool(uint32_t numWorkers = std::thread::hardware_concurrency() - 2);
     ~ThreadPool();
     
     // cancel running jobs
diff --git a/src/scene/Renderer.cpp b/src/scene/Renderer.cpp
index f5ea04c..cb27890 100644
--- a/src/scene/Renderer.cpp
+++ b/src/scene/Renderer.cpp
@@ -10,7 +10,7 @@ Renderer::Renderer()
       .direction = glm::normalize(glm::vec3(-0.4f, -0.2f, -0.6f)),
       .color = glm::vec3(1, 1, 1),
   });
-  bvh.addModels(ModelLoader::loadModel("../res/models/cube.fbx"),
+  bvh.addModels(ModelLoader::loadModel("../res/models/box.glb"),
                 glm::mat4(glm::vec4(1.0f, 0.0f, 0.0f, 0.0f), glm::vec4(0.0f, 1.0f, 0.0f, 0.0f), glm::vec4(0.0f, 0.0f, 1.0f, 0.0f),
                           glm::vec4(0.0f, 0.0f, 0.0f, 1.0f)));
   bvh.generate();
@@ -48,12 +48,14 @@ void Renderer::render(Camera camera, RenderParameter params)
   {
     if (pendingCancel)
       return;
+    auto start = std::chrono::high_resolution_clock::now();
     Batch batch;
     for (int w = 0; w < params.width; ++w)
     {
       batch.jobs.push_back(
           [&](int w, int samp) -> Task
           {
+            // #pragma omp parallel for
             for (int h = 0; h < params.height; ++h)
             {
               Ray cam = Ray(camera.position, glm::normalize(camera.direction));
@@ -99,7 +101,6 @@ void Renderer::render(Camera camera, RenderParameter params)
             co_return;
           }(w, samp));
     }
-    auto start = std::chrono::high_resolution_clock::now();
     threadPool.runBatch(std::move(batch));
     auto end = std::chrono::high_resolution_clock::now();
     std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() << std::endl;
diff --git a/src/scene/Scene.cpp b/src/scene/Scene.cpp
index f3151c4..1232868 100644
--- a/src/scene/Scene.cpp
+++ b/src/scene/Scene.cpp
@@ -68,8 +68,10 @@ void Scene::generate()
     PNode newNode = std::make_unique<Node>(AABB::combine(pendingNodes[lhs]->aabb, pendingNodes[rhs]->aabb));
     newNode->left = std::move(pendingNodes[lhs]);
     newNode->right = std::move(pendingNodes[rhs]);
-    pendingNodes.erase(pendingNodes.begin() + lhs);
+    assert(rhs > lhs);
+    //
     pendingNodes.erase(pendingNodes.begin() + rhs);
+    pendingNodes.erase(pendingNodes.begin() + lhs);
     pendingNodes.push_back(std::move(newNode));
   }
   hierarchy = std::move(pendingNodes[0]);
@@ -94,7 +96,12 @@ void Scene::traceRay(Ray ray, Payload& payload, const float tmin, const float tm
   {
     // russian roulette ray termination
     float p = std::max(std::max(info.brdf.albedo.x, info.brdf.albedo.y), info.brdf.albedo.z);
-    if (payload.depth > 5)
+
+    if (payload.depth >= 12)
+    {
+      return;
+    }
+    else if (payload.depth > 5)
     {
       if (rnd01.z >= p)
         return;
diff --git a/src/util/ModelLoader.cpp b/src/util/ModelLoader.cpp
index 9e04c8d..119a430 100644
--- a/src/util/ModelLoader.cpp
+++ b/src/util/ModelLoader.cpp
@@ -9,6 +9,7 @@ std::vector<PModel> ModelLoader::loadModel(std::string_view filename)
 {
   Assimp::Importer importer;
   const aiScene* scene = importer.ReadFile(std::string(filename), aiProcess_Triangulate);
+  std::cout << importer.GetErrorString() << std::endl;
   std::vector<PModel> result;
   for (int m = 0; m < scene->mNumMeshes; ++m)
   {