add clear button

src/gui/animate.cpp

@@ -697,9 +697,14 @@ void Animate::set_max(int frames) {
     current_frame = std::min(current_frame, max_frame - 1);
 }
 
-void Animate::set(int n_frames, int fps) {
+void Animate::set(int n_frames, int fps, bool replace) {
+    if(replace) {
         max_frame = n_frames;
         frame_rate = fps;
+    } else {
+        max_frame = std::max(n_frames, max_frame);
+        frame_rate = std::min(frame_rate, fps);
+    }
     current_frame = std::min(current_frame, max_frame - 1);
 }
 

src/gui/animate.h

@@ -57,7 +57,7 @@ public:
     const Anim_Camera& camera() const;
     Anim_Camera& camera();
     Camera current_camera() const;
-    void set(int n_frames, int fps);
+    void set(int n_frames, int fps, bool replace);
     void set_max(int frames);
     void invalidate(Skeleton::IK_Handle* handle);
     void invalidate(Joint* handle);

src/gui/manager.cpp

@@ -531,7 +531,14 @@ void Manager::UIsidebar(Scene& scene, Undo& undo, float menu_height, Camera& cam
         ImGui::Text("Edit Scene");
         if(ImGui::Button("Open Scene")) load_scene(scene, undo, true);
         if(wrap_button("Export Scene")) write_scene(scene);
-        if(wrap_button("Settings")) settings_shown = true;
+        if(wrap_button("Clear")) {
+            std::vector<Scene_ID> ids;
+            scene.for_items([&](Scene_Item& item) { 
+                ids.push_back(item.id()); 
+            });
+            for(auto id : ids) undo.del_obj(id);
+            undo.bundle_last(ids.size());
+        }
 
         if(ImGui::Button("Import Objects")) {
             load_scene(scene, undo, false);
@@ -544,6 +551,7 @@ void Manager::UIsidebar(Scene& scene, Undo& undo, float menu_height, Camera& cam
             new_light_window = true;
             new_light_focus = true;
         }
+        
         ImGui::Separator();
     }
 

src/scene/scene.cpp

@@ -972,7 +972,8 @@ std::string Scene::load(Scene::Load_Opts loader, Undo& undo, Gui::Manager& gui,
 
         if(anim->mDuration > 0.0f) {
             gui.get_animate().set((int)std::ceil(anim->mDuration),
-                                  (int)std::round(anim->mTicksPerSecond));
+                                  (int)std::round(anim->mTicksPerSecond), loader.new_scene);
+            
         }
     }
     gui.get_animate().refresh(*this);

src/scene/undo.cpp

@@ -742,6 +742,8 @@ void Undo::redo() {
 
 void Undo::bundle_last(size_t n) {
 
+    if(!n) return;
+
     std::vector<std::unique_ptr<Action_Base>> undo_pack;
     for(size_t i = 0; i < n; i++) {
         undo_pack.push_back(std::move(undos.top()));