[RELEASED] for UE4: Complete Sky and Weather System

[Chrys]

I downloaded the official UE4.13.1 version, then I download the version (4.13 from github).
I then tried to merge the trusky folder into corrisponding folder in my custom engine, but it doesnt compile straight out of the box. (Without it compiles just fine).

I am a perforce user and I got several custom modifications to Unreal which makes “using” the branch (as it seems to be suggested by one of the comments in the code), not really an option.

I really wish there was an easier way to just get the files I need for for us perforce users, it would make integration so much easier instead of having to download the entire engine and then manually merge it by finding which files are modifier/new/removed. had uploaded a zip once (4.10 i think it was for me and some other p4 users and it made integration a piece of cake).

in particular I think part of the code is the culprit.

// Until Epic updates FPostOpaqueRenderDelegate, define SIMUL_UE412_OLD_DEFS to make equivalent, if not using the Simul branch of UE.
#ifdef SIMUL_UE412_OLD_DEFS
typedef FPostOpaqueRenderParameters FRenderDelegateParameters;
typedef FPostOpaqueRenderDelegate FRenderDelegate;
#endif