how to turn on deferred rendering in viewer 3?

[tako Absent]

or the deferred rendering is turned on by default?

[Ansariel Hiller]

Preferences -> Graphics -> Shadows & Lighting

[Theresa Tennyson]

I THINK it's on by default. There are toggles in the "Developer" or "Debug" menu (whichever one is to the right of "Advanced") under "Rendering" for deferred and non-deferred automatic alpha masks. In my viewer they're both switched on.