"Overlap" trace response for visibility and camera channels.

There are checkboxes “Overlap” in **trace **responses for visibility and camera channels:


Could somebody suggest what can they be used for?

If you do a multi line trace on either of those channels, it will return a hit on any objects set to overlap and continue to pass through it. This is useful if you have hitscan weapons that you want to penetrate through objects.

Thank you very much!