diff --git a/src/mesh.cpp b/src/mesh.cpp
index 0bf0ec6..a17d196 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -241,7 +241,7 @@ void Mesh::RenderByOpenGL(OpenGLRenderingContext context, aiNode *node)
     glEnableVertexAttribArray(1);
     glEnableVertexAttribArray(2);
 
-    for (int i = 0; i < node->mNumMeshes; i++)
+    for (unsigned int i = 0; i < node->mNumMeshes; i++)
     {
         auto &obj = m_Entries[node->mMeshes[i]];
 
@@ -276,7 +276,7 @@ void Mesh::RenderByOpenGL(OpenGLRenderingContext context, aiNode *node)
     glDisableVertexAttribArray(1);
     glDisableVertexAttribArray(2);
 
-    for (int i = 0; i < node->mNumChildren; i++)
+    for (unsigned int i = 0; i < node->mNumChildren; i++)
     {
         RenderByOpenGL(context, node->mChildren[i]);
     }
@@ -299,7 +299,7 @@ boost::optional<Intersection> Mesh::Raytrace(const glm::vec3 &source,
         const auto &vertices = obj.first.vertices_;
         const auto &indices = obj.first.indices_;
 
-        for (int i = 0; i < indices.size(); i += 3)
+        for (unsigned int i = 0; i < indices.size(); i += 3)
         {
             auto vertex1 = vertices[indices[i + 0]];
             auto vertex2 = vertices[indices[i + 1]];
diff --git a/src/raytracer.cpp b/src/raytracer.cpp
index aa22cc7..48eee7d 100644
--- a/src/raytracer.cpp
+++ b/src/raytracer.cpp
@@ -6,7 +6,7 @@ boost::optional<Intersection> Raytracer::Trace(glm::vec3 source, glm::vec3 targe
                                                const Scene &scene)
 {
     boost::optional<Intersection> intersection_so_far;
-    auto intersection_dist_so_far = std::numeric_limits<float>::infinity();
+    // auto intersection_dist_so_far = std::numeric_limits<float>::infinity();
     OpenGLRenderingContext ctx;
     ctx.lights_ = scene.point_lights_;
     ctx.ambient = scene.ambient_light_;
@@ -15,11 +15,11 @@ boost::optional<Intersection> Raytracer::Trace(glm::vec3 source, glm::vec3 targe
     {
         if (auto intersection = renderable->Raytrace(source, target, ctx, 1))
         {
-            auto intersection_dist = glm::length(source - intersection->position);
+            // auto intersection_dist = glm::length(source - intersection->position);
             // if (intersection_dist < intersection_dist_so_far)
             //{
             intersection_so_far = intersection;
-            intersection_dist_so_far = intersection_dist;
+            // intersection_dist_so_far = intersection_dist;
             // }
             break;
         }
diff --git a/src/view_raytracer.cpp b/src/view_raytracer.cpp
index bba0964..f96b0af 100644
--- a/src/view_raytracer.cpp
+++ b/src/view_raytracer.cpp
@@ -64,7 +64,7 @@ void ViewRaytracer::TakePicture(glm::vec3 camera_pos, glm::mat4 mvp, const Scene
     auto rt_func = [&](int x_start, int cols) -> void {
         for (int x = x_start; x < x_start + cols; x += 1)
         {
-            for (int y = 0; y < ry_; y += 1)
+            for (unsigned int y = 0; y < ry_; y += 1)
             {
                 float xr = (float(x) - float(rx_ / 2)) / (float(rx_ / 2));
                 float yr = (float(y) - float(ry_ / 2)) / (float(ry_ / 2));
@@ -107,7 +107,7 @@ void ViewRaytracer::TakePicture(glm::vec3 camera_pos, glm::mat4 mvp, const Scene
     auto threads_num = Config::inst().GetOption<int>("threads");
     auto cols_per_thread = Config::inst().GetOption<int>("cols_per_thread");
 
-    for (int x = 0; x < rx_; x += threads_num * cols_per_thread)
+    for (unsigned int x = 0; x < rx_; x += threads_num * cols_per_thread)
     {
         std::vector<std::thread> threads;
         for (int t = 0; t < threads_num; t++)