Update comments.

tutorial/108_MultipleViews/main.cpp

@@ -12,8 +12,9 @@ int main(int argc, char * argv[])
   viewer.load_mesh_from_file(std::string(TUTORIAL_SHARED_PATH) + "/cube.obj");
   viewer.load_mesh_from_file(std::string(TUTORIAL_SHARED_PATH) + "/sphere.obj");
 
-  int left_view, right_view;
-  int cube_id = viewer.data_list[0].id, sphere_id = viewer.data_list[1].id;
+  unsigned int left_view, right_view;
+  int cube_id = viewer.data_list[0].id;
+  int sphere_id = viewer.data_list[1].id;
   viewer.callback_init = [&](igl::opengl::glfw::Viewer &)
   {
     viewer.core().viewport = Eigen::Vector4f(0, 0, 640, 800);
@@ -26,8 +27,8 @@ int main(int argc, char * argv[])
   {
     if(key == GLFW_KEY_SPACE)
     {
-      // by default, when a core is appended, all loaded meshes will be displayed in that core
-      // displaying can be controlled by changing viewer.coreDataPairs
+      // By default, when a core is appended, all loaded meshes will be displayed in that core.
+      // Displaying can be controlled by calling viewer.data().set_visible().
       viewer.data(cube_id).set_visible(false, left_view);
       viewer.data(sphere_id).set_visible(false, right_view);
     }