1 files changed, 36 insertions, 2 deletions
diff --git a/src/states/simulation_state.cpp b/src/states/simulation_state.cpp
index 9f1e0a7..540f236 100644
--- a/src/states/simulation_state.cpp
+++ b/src/states/simulation_state.cpp
@@ -1,6 +1,7 @@
 #include "simulation_state.h"
 #include "rendering/renderer.h"
 #include "core/application.h"
+#include "core/hdri_manager.h"
 #include "core/window.h"
 #include "core/event.h"
 #include "core/settings_manager.h"
@@ -10,6 +11,7 @@
 #include <chrono>
 #include <iomanip>
 #include <sstream>
+#include <vector>
 
 namespace Donut
 {
@@ -165,9 +167,7 @@ namespace Donut
         ImGui::Text("Objects: %zu", engine.get_objects().size());
         
         if (ImGui::Button("Print Object Info"))
-        {
             engine.print_object_info();
-        }
         
         int compute_height = engine.get_compute_height();
         if (ImGui::SliderInt("Compute Height", &compute_height, 64, 2048))
@@ -281,6 +281,40 @@ namespace Donut
         
         ImGui::Spacing();
         
+        ImGui::TextColored(ImVec4(0.9f, 0.9f, 1.0f, 1.0f), "HDRI Environment");
+        ImGui::Separator();
+        
+        static int selected_hdri = 0;
+        ImGui::PushID("SimulationHDRI");
+        auto& hdri_manager = HDRIManager::get();
+        const auto& available_hdri = hdri_manager.get_available_hdri();
+        
+        static std::vector<std::string> hdri_option_names;
+        static std::vector<const char*> hdri_options;
+        
+        if (hdri_option_names.size() != available_hdri.size())
+        {
+            hdri_option_names.clear();
+            hdri_options.clear();
+            
+            for (const auto& path : available_hdri)
+            {
+                hdri_option_names.push_back(hdri_manager.get_hdri_name(path));
+                hdri_options.push_back(hdri_option_names.back().c_str());
+            }
+        }
+
+        if (ImGui::Combo("HDRI Environment", &selected_hdri, hdri_options.data(), static_cast<int>(hdri_options.size())))
+        {
+            auto& hdri_manager = HDRIManager::get();
+            hdri_manager.set_current_hdri(available_hdri[selected_hdri]);
+            engine.set_hdri_environment(hdri_manager.get_current_hdri());
+        }
+        ImGui::TextDisabled("HDRI provides background and lighting for the simulation");
+        ImGui::PopID();
+        
+        ImGui::Spacing();
+        
         ImGui::TextColored(ImVec4(0.9f, 0.9f, 1.0f, 1.0f), "Camera");
         ImGui::Separator();