I plan to use UDK on PC to create commercial game. Can I use deferred rendering in UDK? Or it's only available with expensive UE3 license?
With UDK, you have access to the whole UE3 kit, you will have to pay only when you start earning money. This means you have access to the deferred rendering.
UDK provides access to the full UE3 feature set
It could be expensive, if you are making millions. But still their royalties are quite fair