diff --git a/src/render_utils.c b/src/render_utils.c
index 806a7af..73b17eb 100644
--- a/src/render_utils.c
+++ b/src/render_utils.c
@@ -23,6 +23,14 @@ inline void CameraState_Init(CameraState* camera_state) {
   camera_state->up[1] = 1.f;
   camera_state->up[2] = 0.f;
 
+  camera_state->pos[0] = 0.f;
+  camera_state->pos[1] = 0.f;
+  camera_state->pos[2] = 0.f;
+
+  camera_state->vel[0] = 0.f;
+  camera_state->vel[1] = 0.f;
+  camera_state->vel[2] = 0.f;
+
   memcpy(&camera_state->mtxView, &mtx_identity, sizeof(camera_state->mtxView));
   CameraState_CalcFromMatrix(camera_state, &camera_state->mtxView);
 }
@@ -93,9 +101,9 @@ inline void CameraState_Update(
 
   camera_state->heading -= dt * mouse_dx * mouse_sensitivity * M_PI / 180.f;
   if (camera_state->heading < -M_PI) {
-    camera_state->heading += M_PI;
+    camera_state->heading += M_PI * 2.f;
   } else if (camera_state->heading > M_PI) {
-    camera_state->heading -= M_PI;
+    camera_state->heading -= M_PI * 2.f;
   }
   camera_state->pitch += dt * mouse_dy * mouse_sensitivity * M_PI / 180.f;
   if (camera_state->pitch < -M_PI * 0.49) {
diff --git a/src/simulator.cc b/src/simulator.cc
index 99fdf76..4469984 100644
--- a/src/simulator.cc
+++ b/src/simulator.cc
@@ -118,8 +118,6 @@ void simulator_reset() {
 void simulator_gui() {
   ZoneScoped;
 
-  ImGui::Begin("Simulator");
-
   sStateHistoryCurrent =
       std::min(sStateHistoryCurrent, sthstry_get_num_states(sStateHistory) - 1);
 
@@ -184,8 +182,6 @@ void simulator_gui() {
     ImGui::PopID();
     body.updateCollisionShapes();
   }
-
-  ImGui::End();
 }
 
 void simulator_update(double dt) {
diff --git a/src/vissim.cc b/src/vissim.cc
index 9c170e1..0991657 100644
--- a/src/vissim.cc
+++ b/src/vissim.cc
@@ -4,10 +4,10 @@
 // clang-format on
 
 #include <GLFW/glfw3.h>
-#include <csignal>
 #include <unistd.h>
 
 #include <Tracy.hpp>
+#include <csignal>
 #include <cstdio>
 #include <iostream>
 
@@ -20,10 +20,10 @@
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
 #include "imgui_internal.h"
+#include "render_utils.h"
 #include "simulator.h"
 #include "srender.h"
 #include "utils.h"
-#include "render_utils.h"
 
 GLFWwindow* gWindow = nullptr;
 GuiInputState* gGuiInputState = nullptr;
@@ -64,6 +64,14 @@ bool gGizmoEnabled = true;
 enum ControlMode { ControlModeNone = 0, ControlModeFirstPersonView = 1 };
 ControlMode gControlMode = ControlModeNone;
 
+struct Dialogs {
+  bool mCameraDialog = false;
+  bool mImGuiDemo = false;
+  bool mSimulator = false;
+  bool mImGuizmoTransform = false;
+};
+Dialogs* gDialogs = nullptr;
+
 using namespace std;
 
 static void error_callback(int error, const char* description) {
@@ -254,78 +262,82 @@ void ShowTransformManip(
   window_size.x -= imgui_style.WindowPadding.x * 2;
   window_size.y -= imgui_style.WindowPadding.y * 2 + title_height;
 
-  ImGui::Begin("Guizmo");
+  if (gDialogs->mImGuizmoTransform) {
+    ImGui::Begin("Guizmo", &gDialogs->mImGuizmoTransform);
 
-  if (editTransformDecomposition) {
-    if (ImGui::IsKeyPressed(90)) mCurrentGizmoOperation = ImGuizmo::TRANSLATE;
-    if (ImGui::IsKeyPressed(69)) mCurrentGizmoOperation = ImGuizmo::ROTATE;
-    if (ImGui::IsKeyPressed(82))  // r Key
-      mCurrentGizmoOperation = ImGuizmo::SCALE;
-    if (ImGui::RadioButton(
-            "Translate",
-            mCurrentGizmoOperation == ImGuizmo::TRANSLATE))
-      mCurrentGizmoOperation = ImGuizmo::TRANSLATE;
-    ImGui::SameLine();
-    if (ImGui::RadioButton(
-            "Rotate",
-            mCurrentGizmoOperation == ImGuizmo::ROTATE))
-      mCurrentGizmoOperation = ImGuizmo::ROTATE;
-    ImGui::SameLine();
-    if (ImGui::RadioButton("Scale", mCurrentGizmoOperation == ImGuizmo::SCALE))
-      mCurrentGizmoOperation = ImGuizmo::SCALE;
-    if (ImGui::RadioButton(
-            "Universal",
-            mCurrentGizmoOperation == ImGuizmo::UNIVERSAL))
-      mCurrentGizmoOperation = ImGuizmo::UNIVERSAL;
-    float matrixTranslation[3], matrixRotation[3], matrixScale[3];
-    ImGuizmo::DecomposeMatrixToComponents(
-        matrix,
-        matrixTranslation,
-        matrixRotation,
-        matrixScale);
-    ImGui::InputFloat3("Tr", matrixTranslation);
-    ImGui::InputFloat3("Rt", matrixRotation);
-    ImGui::InputFloat3("Sc", matrixScale);
-    ImGuizmo::RecomposeMatrixFromComponents(
-        matrixTranslation,
-        matrixRotation,
-        matrixScale,
-        matrix);
-
-    if (mCurrentGizmoOperation != ImGuizmo::SCALE) {
-      if (ImGui::RadioButton("Local", mCurrentGizmoMode == ImGuizmo::LOCAL))
-        mCurrentGizmoMode = ImGuizmo::LOCAL;
+    if (editTransformDecomposition) {
+      if (ImGui::IsKeyPressed(90)) mCurrentGizmoOperation = ImGuizmo::TRANSLATE;
+      if (ImGui::IsKeyPressed(69)) mCurrentGizmoOperation = ImGuizmo::ROTATE;
+      if (ImGui::IsKeyPressed(82))  // r Key
+        mCurrentGizmoOperation = ImGuizmo::SCALE;
+      if (ImGui::RadioButton(
+              "Translate",
+              mCurrentGizmoOperation == ImGuizmo::TRANSLATE))
+        mCurrentGizmoOperation = ImGuizmo::TRANSLATE;
       ImGui::SameLine();
-      if (ImGui::RadioButton("World", mCurrentGizmoMode == ImGuizmo::WORLD))
-        mCurrentGizmoMode = ImGuizmo::WORLD;
-    }
-    if (ImGui::IsKeyPressed(83)) useSnap = !useSnap;
-    ImGui::Checkbox("", &useSnap);
-    ImGui::SameLine();
-
-    switch (mCurrentGizmoOperation) {
-      case ImGuizmo::TRANSLATE:
-        ImGui::InputFloat3("Snap", &snap[0]);
-        break;
-      case ImGuizmo::ROTATE:
-        ImGui::InputFloat("Angle Snap", &snap[0]);
-        break;
-      case ImGuizmo::SCALE:
-        ImGui::InputFloat("Scale Snap", &snap[0]);
-        break;
-    }
-    ImGui::Checkbox("Bound Sizing", &boundSizing);
-    if (boundSizing) {
-      ImGui::PushID(3);
-      ImGui::Checkbox("", &boundSizingSnap);
+      if (ImGui::RadioButton(
+              "Rotate",
+              mCurrentGizmoOperation == ImGuizmo::ROTATE))
+        mCurrentGizmoOperation = ImGuizmo::ROTATE;
       ImGui::SameLine();
-      ImGui::InputFloat3("Snap", boundsSnap);
-      ImGui::PopID();
+      if (ImGui::RadioButton(
+              "Scale",
+              mCurrentGizmoOperation == ImGuizmo::SCALE))
+        mCurrentGizmoOperation = ImGuizmo::SCALE;
+      if (ImGui::RadioButton(
+              "Universal",
+              mCurrentGizmoOperation == ImGuizmo::UNIVERSAL))
+        mCurrentGizmoOperation = ImGuizmo::UNIVERSAL;
+      float matrixTranslation[3], matrixRotation[3], matrixScale[3];
+      ImGuizmo::DecomposeMatrixToComponents(
+          matrix,
+          matrixTranslation,
+          matrixRotation,
+          matrixScale);
+      ImGui::InputFloat3("Tr", matrixTranslation);
+      ImGui::InputFloat3("Rt", matrixRotation);
+      ImGui::InputFloat3("Sc", matrixScale);
+      ImGuizmo::RecomposeMatrixFromComponents(
+          matrixTranslation,
+          matrixRotation,
+          matrixScale,
+          matrix);
+
+      if (mCurrentGizmoOperation != ImGuizmo::SCALE) {
+        if (ImGui::RadioButton("Local", mCurrentGizmoMode == ImGuizmo::LOCAL))
+          mCurrentGizmoMode = ImGuizmo::LOCAL;
+        ImGui::SameLine();
+        if (ImGui::RadioButton("World", mCurrentGizmoMode == ImGuizmo::WORLD))
+          mCurrentGizmoMode = ImGuizmo::WORLD;
+      }
+      if (ImGui::IsKeyPressed(83)) useSnap = !useSnap;
+      ImGui::Checkbox("", &useSnap);
+      ImGui::SameLine();
+
+      switch (mCurrentGizmoOperation) {
+        case ImGuizmo::TRANSLATE:
+          ImGui::InputFloat3("Snap", &snap[0]);
+          break;
+        case ImGuizmo::ROTATE:
+          ImGui::InputFloat("Angle Snap", &snap[0]);
+          break;
+        case ImGuizmo::SCALE:
+          ImGui::InputFloat("Scale Snap", &snap[0]);
+          break;
+      }
+      ImGui::Checkbox("Bound Sizing", &boundSizing);
+      if (boundSizing) {
+        ImGui::PushID(3);
+        ImGui::Checkbox("", &boundSizingSnap);
+        ImGui::SameLine();
+        ImGui::InputFloat3("Snap", boundsSnap);
+        ImGui::PopID();
+      }
     }
+
+    ImGui::End();
   }
 
-  ImGui::End();
-
   ImGuiIO& io = ImGui::GetIO();
   float viewManipulateRight = io.DisplaySize.x;
   float viewManipulateTop = 0;
@@ -407,7 +419,12 @@ void DoRender() {
 
   if (gViewMode == ViewModeSimulation) {
     simulator_draw(gRndrCmds);
-    simulator_gui();
+
+    if (gDialogs->mSimulator) {
+      ImGui::Begin("Simulator", &gDialogs->mSimulator);
+      simulator_gui();
+      ImGui::End();
+    }
   } else {
     RenderGuizmoTest(gRndrCmds);
   }
@@ -426,9 +443,10 @@ void DoRender() {
   ImGuiIO& io = ImGui::GetIO();
 
   ShowViewManip();
-  ShowTransformManip((float*)&(gCameraState->mtxView),
-                     (float*)&(gProjMatrix),
-                     (float*)(&gTransformMatrix));
+  ShowTransformManip(
+      (float*)&(gCameraState->mtxView),
+      (float*)&(gProjMatrix),
+      (float*)(&gTransformMatrix));
 
   ImGui::End();
 }
@@ -516,6 +534,9 @@ int main(void) {
   CameraState_Init(&camera_state);
   gCameraState = &camera_state;
 
+  Dialogs dialogs;
+  gDialogs = &dialogs;
+
   gRndr = srndr_create();
   gView = srview_create();
   gRndrCmds = srcmdbuf_create(1024);
@@ -575,11 +596,13 @@ int main(void) {
       ImGui::BeginMainMenuBar();
 
       if (ImGui::BeginMenu("Dialogs")) {
-        ImGui::Checkbox("ImGui Demo", &show_demo_window);
+        ImGui::Checkbox("Camera", &gDialogs->mCameraDialog);
+        ImGui::Checkbox("Simulator", &gDialogs->mSimulator);
+        ImGui::Checkbox("ImGuizmo Transform", &gDialogs->mImGuizmoTransform);
+        ImGui::Checkbox("ImGui Demo", &gDialogs->mImGuiDemo);
         ImGui::EndMenu();
       }
 
-
       float menu_bar_height = ImGui::GetWindowHeight();
       ImGui::EndMainMenuBar();
 
@@ -616,26 +639,49 @@ int main(void) {
           camera_accel[2] += 100.f;
         }
 
-        CameraState_Update(gCameraState, frame_delta_time, gGuiInputState->mousedX, gGuiInputState->mousedY, camera_accel);
+        CameraState_Update(
+            gCameraState,
+            frame_delta_time,
+            gGuiInputState->mousedX,
+            gGuiInputState->mousedY,
+            camera_accel);
       }
 
-      ImGui::Begin("Camera Controls");
+      if (gDialogs->mCameraDialog) {
+        ImGui::Begin("Camera Controls", &gDialogs->mCameraDialog);
 
-      bool changed = false;
-      changed = ImGui::SliderFloat("Heading", &gCameraState->heading, -M_PI * 0.98, M_PI * 0.98);
-      changed = ImGui::SliderFloat("Pitch", &gCameraState->pitch, -M_PI * 0.49, M_PI * 0.49) || changed;
+        bool changed = false;
+        changed = ImGui::SliderFloat(
+            "Heading",
+            &gCameraState->heading,
+            -M_PI * 0.98,
+            M_PI * 0.98);
+        changed = ImGui::SliderFloat(
+                      "Pitch",
+                      &gCameraState->pitch,
+                      -M_PI * 0.49,
+                      M_PI * 0.49)
+                  || changed;
 
-      changed = ImGui::SliderFloat3("Forward", gCameraState->forward, -1.f, 1.f) || changed;
-      changed = ImGui::SliderFloat3("Right", gCameraState->right, -1.f, 1.f) || changed;
-      changed = ImGui::SliderFloat3("Up", gCameraState->up, -1.f, 1.f) || changed;
-      changed = ImGui::SliderFloat3("Pos", gCameraState->pos, -100.f, 100.f) || changed;
+        changed =
+            ImGui::SliderFloat3("Forward", gCameraState->forward, -1.f, 1.f)
+            || changed;
+        changed = ImGui::SliderFloat3("Right", gCameraState->right, -1.f, 1.f)
+                  || changed;
+        changed =
+            ImGui::SliderFloat3("Up", gCameraState->up, -1.f, 1.f) || changed;
+        changed = ImGui::SliderFloat3("Pos", gCameraState->pos, -100.f, 100.f)
+                  || changed;
 
-      if (changed) {
-        CameraState_CalcToMatrix(gCameraState, &gCameraState->mtxView);
+        if (changed) {
+          CameraState_CalcToMatrix(gCameraState, &gCameraState->mtxView);
+        }
+        ImGui::End();
       }
-      ImGui::End();
 
-      if (show_demo_window) ImGui::ShowDemoWindow();
+      if (gDialogs->mImGuiDemo) {
+        ImGui::ShowDemoWindow(&gDialogs->mImGuiDemo);
+      }
 
       ShowDockspace(true);