How can I use Realtime gobal illumination？
Realtime Global Illumination - is a technique to achieve believable lighting in real-time.
This requires decent technology to implement, and is fairly difficult and nearly not feasible in WebGL due to limits of WebGL platform, or lack of certain features as well as nature of web is pretty much limiting.
It is possible though, especially in the future.
There is no support of realtime GI in any of WebGL engines out there. And even only selected list of high-end engines do realtime GI with certain list of limitations and requirements towards authoring content.
There is no realtime GI for PlayCanvas atm.
thanks for reply,thank you.