From 7b0afff07341f71422198dfe45bb91b49e0fa42d Mon Sep 17 00:00:00 2001
From: Evgeny Prikazchikov <eprikazchikov@mail.ru>
Date: Mon, 8 Jun 2026 18:16:50 +0300
Subject: [PATCH] Editor: Fallback camera is active at the start of the
 simulation #1343

---
 engine/includes/components/camera.h     |  5 +++
 engine/src/components/camera.cpp        | 44 +++++++++++++++++--------
 engine/src/editor/viewport/viewport.cpp | 12 +++----
 3 files changed, 40 insertions(+), 21 deletions(-)

diff --git a/engine/includes/components/camera.h b/engine/includes/components/camera.h
index f3e76991e..2723dbda6 100644
--- a/engine/includes/components/camera.h
+++ b/engine/includes/components/camera.h
@@ -30,6 +30,7 @@ class ENGINE_EXPORT Camera : public Component {
 
 public:
     Camera();
+    ~Camera();
 
     Matrix4 viewMatrix() const;
     Matrix4 projectionMatrix() const;
@@ -66,6 +67,8 @@ class ENGINE_EXPORT Camera : public Component {
     static Camera *current();
     static void setCurrent(Camera *current);
 
+    static Camera *findActiveCamera(World *world);
+
     Vector3 project(const Vector3 &worldSpace) const;
     Vector3 unproject(const Vector3 &screenSpace) const;
 
@@ -101,6 +104,8 @@ class ENGINE_EXPORT Camera : public Component {
 
     bool m_screen;
 
+    bool m_main;
+
     mutable bool m_dirty;
 
 };
diff --git a/engine/src/components/camera.cpp b/engine/src/components/camera.cpp
index 53557218a..3c1dd36f8 100644
--- a/engine/src/components/camera.cpp
+++ b/engine/src/components/camera.cpp
@@ -28,8 +28,15 @@ Camera::Camera() :
         m_screen(false),
         m_dirty(true) {
 
+    static uint32_t hash = Mathf::hashString("cameras");
+    addTagByHash(hash);
 }
 
+Camera::~Camera() {
+    if(s_currentCamera == this) {
+        s_currentCamera = nullptr;
+    }
+}
 /*!
     Returns view matrix for the camera.
 */
@@ -259,21 +266,15 @@ void Camera::setScreenSpace(bool mode) {
 */
 Camera *Camera::current() {
     if(s_currentCamera == nullptr || !s_currentCamera->isEnabled() || !s_currentCamera->actor()->isEnabled()) {
-        s_currentCamera = nullptr;
-        for(auto it : Engine::world()->findChildren<Camera *>()) {
-            if(it->isEnabled() && it->actor()->isEnabled()) { // Get first active Camera
-                s_currentCamera = it;
-                break;
-            }
-        }
+        s_currentCamera = findActiveCamera(Engine::world());
 
         if(s_currentCamera == nullptr) {
-            static Camera *reserveCamera = nullptr;
-            if(reserveCamera == nullptr) {
-                Actor *cameraActor = Engine::composeActor<Camera>("ReserveCamera", Engine::world());
-                reserveCamera = cameraActor->getComponent<Camera>();
+            static Camera *fallbackCamera = nullptr;
+            if(fallbackCamera == nullptr) {
+                Actor *cameraActor = Engine::composeActor<Camera>("FallbackCamera", nullptr);
+                fallbackCamera = cameraActor->getComponent<Camera>();
             }
-            s_currentCamera = reserveCamera;
+            s_currentCamera = fallbackCamera;
             s_currentCamera->actor()->setEnabled(true);
             s_currentCamera->setEnabled(true);
         }
@@ -287,7 +288,24 @@ Camera *Camera::current() {
 void Camera::setCurrent(Camera *current) {
     s_currentCamera = current;
 }
-
+/*!
+    Returns a first active camera in the \a world
+*/
+Camera *Camera::findActiveCamera(World *world) {
+    static uint32_t hash = Mathf::hashString("cameras");
+    for(auto scene : world->scenes()) {
+        for(auto it : scene->getObjectsInGroupByHash(hash)) {
+            Camera *camera = static_cast<Camera *>(it);
+            if(camera->isEnabled() && camera->actor()->isEnabled()) { // Get first active Camera
+                return camera;
+            }
+        }
+    }
+    return nullptr;
+}
+/*!
+    Returns a set of frustum planes.
+*/
 Frustum Camera::frustum() const {
     Transform *t = transform();
 
diff --git a/engine/src/editor/viewport/viewport.cpp b/engine/src/editor/viewport/viewport.cpp
index 536f7ced8..65c82f3f4 100644
--- a/engine/src/editor/viewport/viewport.cpp
+++ b/engine/src/editor/viewport/viewport.cpp
@@ -174,13 +174,7 @@ void Viewport::onDraw() {
         Engine::renderSystem()->setPipelineContext(m_pipelineContext);
 
         if(m_gameView) {
-            for(auto it : m_world->findChildren<Camera *>()) {
-                if(it->isEnabled() && it->actor()->isEnabled()) { // Get first active Camera
-                    Camera::setCurrent(it);
-                    break;
-                }
-            }
-
+            Camera::setCurrent(Camera::findActiveCamera(Engine::world()));
             Engine::update(m_world);
 
             if(!m_gamePaused && isFocused()) {
@@ -217,7 +211,9 @@ void Viewport::onDraw() {
                 m_controller->update();
             }
             onCursorSet(instance.mouseCursor());
-            instance.update();
+            if(!m_gameView) {
+                instance.update();
+            }
         }
 
         if(m_screenInProgress && m_color) {