Adding default model

gl/gl.qrc

@@ -4,5 +4,6 @@
         <file>mesh.vert</file>
         <file>quad.frag</file>
         <file>quad.vert</file>
+        <file>sphere.stl</file>
     </qresource>
 </RCC>

src/app.cpp

@@ -8,6 +8,7 @@ App::App(int argc, char *argv[]) :
     QApplication(argc, argv), window(new Window())
 {
     window->show();
+    window->load_stl(":gl/sphere.stl");
 }
 
 bool App::event(QEvent* e)

src/window.cpp

@@ -88,8 +88,11 @@ bool Window::load_stl(const QString& filename)
     connect(loader, &Loader::finished,
             [=](){ canvas->set_status(""); });
 
-    connect(loader, &Loader::loaded_file,
-            this, &Window::setWindowTitle);
+    if (filename[0] != ':')
+    {
+        connect(loader, &Loader::loaded_file,
+                this, &Window::setWindowTitle);
+    }
 
     loader->start();
     return true;