diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0c915d9..3fba944 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,6 +1,9 @@
 target_sources(RayTracer 
 	PRIVATE 
-		main.cpp)
+		main.cpp
+		Minimal.h
+		ThreadPool.h
+		ThreadPool.cpp)
 
 add_subdirectory(scene/)
 add_subdirectory(window/)
diff --git a/src/ThreadPool.cpp b/src/ThreadPool.cpp
new file mode 100644
index 0000000..7a3f3e4
--- /dev/null
+++ b/src/ThreadPool.cpp
@@ -0,0 +1,65 @@
+#include "ThreadPool.h"
+#include <mutex>
+
+ThreadPool::ThreadPool(uint32_t numThreads)
+{
+    for (uint32_t i = 0; i < numThreads; ++i)
+    {
+        workers.push_back(std::thread(&ThreadPool::work, this));
+    }
+}
+
+ThreadPool::~ThreadPool()
+{
+    running.store(false);
+    {
+        std::unique_lock l(queueLock);
+        queueCV.notify_all();
+    }
+    for(auto& worker : workers)
+    {
+        worker.join();
+    }
+}
+
+void ThreadPool::addJob(std::function<void()>&& job)
+{
+    std::unique_lock l(queueLock);
+    taskQueue.push_back(job);
+    queueCV.notify_one();
+}
+
+void ThreadPool::waitIdle()
+{
+    while(true)
+    {
+        std::unique_lock l(queueLock);
+        if(taskQueue.empty())
+            return;
+        completedCV.wait(l);
+    }
+}
+
+void ThreadPool::work()
+{
+    while(running)
+    {
+        std::function<void()> job;
+        {
+            std::unique_lock l(queueLock);
+            if(taskQueue.empty())
+            {
+                queueCV.wait(l);
+                continue;
+            }
+            job = taskQueue.front();
+            taskQueue.pop_front();
+        }
+        job();
+        {
+            std::unique_lock l(queueLock);
+            completedCV.notify_one();
+        }
+    }
+}
+
diff --git a/src/ThreadPool.h b/src/ThreadPool.h
new file mode 100644
index 0000000..1aaea19
--- /dev/null
+++ b/src/ThreadPool.h
@@ -0,0 +1,22 @@
+#pragma once
+#include <condition_variable>
+#include <functional>
+#include <list>
+#include <thread>
+
+class ThreadPool
+{
+public:
+    ThreadPool(uint32_t numWorkers = std::thread::hardware_concurrency());
+    ~ThreadPool();
+    void addJob(std::function<void()>&& job);
+    void waitIdle();
+private:
+    std::atomic_bool running = true;
+    void work();
+    std::mutex queueLock;
+    std::condition_variable queueCV;
+    std::condition_variable completedCV;
+    std::list<std::function<void()>> taskQueue;
+    std::vector<std::thread> workers;
+};
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 02e2172..78051bf 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,7 +9,7 @@ int main()
     bvh.generate();
     Window w(1920, 1080);
     std::vector<unsigned char> texture(1920 * 1080 * 3);
-    for (int j = 10; j < 100; ++j)
+    for (int j = 100; j < 200; ++j)
     {
         for (int i = 0; i < 1920; ++i)
         {
diff --git a/src/scene/AABB.h b/src/scene/AABB.h
index 6aed089..e0f9c5a 100644
--- a/src/scene/AABB.h
+++ b/src/scene/AABB.h
@@ -2,6 +2,7 @@
 #include <array>
 #include <glm/glm.hpp>
 #include <algorithm>
+#include "util/Ray.h"
 
 struct AABB
 {
@@ -42,6 +43,11 @@ struct AABB
             max = glm::vec3(std::max(max.x, transformed.x), std::max(max.y, transformed.y), std::max(max.z, transformed.z));
         }
     }
+    bool intersects(Ray ray)
+    {
+        assert(false && "TODO");
+        return false;
+    }
     static AABB combine(AABB lhs, AABB rhs)
     {
         AABB result = {
diff --git a/src/scene/BVH.cpp b/src/scene/BVH.cpp
index f3f9542..6379e6c 100644
--- a/src/scene/BVH.cpp
+++ b/src/scene/BVH.cpp
@@ -1,5 +1,6 @@
 #include "BVH.h"
-#include <list>
+#include <algorithm>
+#include <ranges>
 
 void BVH::addModel(PModel model, glm::mat4 transform)
 {
@@ -54,3 +55,35 @@ void BVH::generate()
     }
     hierarchy = std::move(pendingNodes[0]);
 }
+
+std::optional<IntersectionInfo> BVH::traceRay(Ray ray)
+{
+}
+
+std::vector<IntersectionInfo> BVH::generateIntersections(PNode& currentNode, Ray ray)
+{
+    if(!currentNode->aabb.intersects(ray))
+    {
+        return {};
+    }
+    if(currentNode->model != nullptr)
+    {
+        auto result = currentNode->model->intersect(ray);
+        if(result.has_value())
+        {
+            return {*result};
+        }
+        else 
+        {
+            return {};
+        }
+    }
+    auto leftResults = generateIntersections(currentNode->left, ray);
+    auto rightResults = generateIntersections(currentNode->right, ray);
+
+    for(auto it : rightResults)
+    {
+        leftResults.push_back(it);
+    }
+    return leftResults;
+}
\ No newline at end of file
diff --git a/src/scene/BVH.h b/src/scene/BVH.h
index 1c258cb..8f27686 100644
--- a/src/scene/BVH.h
+++ b/src/scene/BVH.h
@@ -3,6 +3,8 @@
 #include "util/Model.h"
 #include <vector>
 #include <glm/glm.hpp>
+#include "util/Ray.h"
+
 
 class BVH
 {
@@ -11,6 +13,8 @@ class BVH
     void addModels(std::vector<PModel> models, glm::mat4 transform);
     void generate();
 
+    std::optional<IntersectionInfo> traceRay(Ray ray);
+
   private:
     DECLARE_REF(Node)
     struct Node
@@ -24,4 +28,6 @@ class BVH
     };
     PNode hierarchy;
     std::vector<PModel> models;
+
+    std::vector<IntersectionInfo> generateIntersections(PNode& currentNode, Ray ray);
 };
\ No newline at end of file
diff --git a/src/scene/Scene.cpp b/src/scene/Scene.cpp
index 7e0ed7c..99ffeae 100644
--- a/src/scene/Scene.cpp
+++ b/src/scene/Scene.cpp
@@ -1,3 +1,9 @@
 #include "Scene.h"
 
+Scene::Scene()
+    : window(1920, 1080)
+{
+
+}
+
 void Scene::render() {}
diff --git a/src/scene/Scene.h b/src/scene/Scene.h
index 066c874..e99dce6 100644
--- a/src/scene/Scene.h
+++ b/src/scene/Scene.h
@@ -5,9 +5,11 @@
 class Scene
 {
   public:
+    Scene();
+    ~Scene();
     void render();
   private:
     Window window;
-    std::vector<uint32_t> image;
+    std::vector<unsigned char> image;
     BVH bvh;
 };
\ No newline at end of file
diff --git a/src/util/Model.cpp b/src/util/Model.cpp
index e69de29..59833a9 100644
--- a/src/util/Model.cpp
+++ b/src/util/Model.cpp
@@ -0,0 +1,6 @@
+#include "Model.h"
+
+std::optional<IntersectionInfo> Model::intersect(Ray ray)
+{
+    return {};
+}
\ No newline at end of file
diff --git a/src/util/Model.h b/src/util/Model.h
index 8d884d4..c08bfd4 100644
--- a/src/util/Model.h
+++ b/src/util/Model.h
@@ -3,11 +3,24 @@
 #include "scene/AABB.h"
 #include <vector>
 
+// material infos
+// shading parameter
+// hit data
+struct IntersectionInfo
+{
+  float t;
+  glm::vec3 position;
+  glm::vec3 normal;
+  glm::vec3 albedo;
+  glm::vec3 emissive;
+  //....
+};
 class Model
 {
 public:
     AABB boundingBox;
 	std::vector<glm::vec3> positions;
 	std::vector<uint32_t> indices;
+	std::optional<IntersectionInfo> intersect(Ray ray);
 };
 DECLARE_REF(Model)
\ No newline at end of file
diff --git a/src/window/Window.cpp b/src/window/Window.cpp
index 529bc11..189166d 100644
--- a/src/window/Window.cpp
+++ b/src/window/Window.cpp
@@ -18,18 +18,8 @@ Window::Window(int width, int height) : width(width), height(height)
     glBindVertexArray(vao);
     glGenTextures(1, &texture);
     glBindTexture(GL_TEXTURE_2D, texture);
-    std::vector<unsigned char> texture(1920 * 1080 * 4);
-    for (int j = 0; j < 1080; ++j)
-    {
-        for (int i = 0; i < 1920; ++i)
-        {
-            texture[(j * 1920 + i) * 3] = 0xff;
-            texture[(j * 1920 + i) * 3 + 1] = 0xff;
-            texture[(j * 1920 + i) * 3 + 2] = 0x0;
-            texture[(j * 1920 + i) * 3 + 2] = 0xff;
-        }
-    }
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture.data());
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     program = glCreateProgram();
     vertShader = glCreateShader(GL_VERTEX_SHADER);
     fragShader = glCreateShader(GL_FRAGMENT_SHADER);
@@ -90,7 +80,7 @@ void Window::update(const std::vector<unsigned char>& textureData)
 {
     glClear(GL_COLOR_BUFFER_BIT);
     glBindTexture(GL_TEXTURE_2D, texture);
-    //glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, textureData.data());
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, textureData.data());
     glUseProgram(program);
     glDrawArrays(GL_TRIANGLES, 0, 3);
     glfwSwapBuffers(window);