Bugfix - init all children when init group

ImGuiVisitor.cpp

@@ -81,9 +81,7 @@ void ImGuiVisitor::visit(Primitive &n)
     ImGui::PushID(n.id());
     ImGui::Text("Primitive");
 
-    if (n.getShader())
-        n.getShader()->accept(*this);
-
+    n.getShader()->accept(*this);
 
     ImGui::PopID();
 }

Scene.cpp

@@ -172,6 +172,11 @@ Group::~Group()
 
 void Group::init()
 {
+    for (std::vector<Node*>::iterator node = children_.begin();
+         node != children_.end(); node++) {
+        (*node)->init();
+    }
+
     visible_ = true;
     initialized_ = true;
 }