The engine will only re-render the scene when
needed, and automatically pause rendering when appropriate,
e.g. when the containing browser tab is in the background.
Using the play and pause methods the engine can also be paused manually. This can
be used to pause the engine when the containing element scrolls
off the page.
Methods
(static) pause()
Pauses the engine. See also Rendering.play
(static) play()
Resumes the engine. See also Rendering.pause