Obviously, if this flag is toggled the user can see it, if not it will be hidden. ;)
When an object is created it's turned off, so you will be able push your geometry data and turn it on after you're done. That avaoids flickering and stuff.
When this is toggled on, you will receive click events. Don't use it if you don't need it, it will eat performance.
Placeholder for pointer (onmouseover-event enabler) events. Not implemented yet.