I am trying Titan Engine Source build, but D.shadowSoft() has no effect at all. Whatever value I put in. Is there something changed about this function in source build ?

It works fine. Please try again.

I dont think so, let see these images,

first one is my game on current stable titan engine version, that is soft shadow I expect
https://i.gyazo.com/57b870d5f9d821e3c3a8...6e674a.png

and this one is on source build engine version
https://i.gyazo.com/4c150389706a4bc995a7...ddcadb.png

both use D.shadowJitter(true) and D.shadowSoft(5). Both version have identical code.
The second one seems only be appied jitter, not shadowsoft, because I can see those "gird shadow" around thicker shadow area.

In source build version, wherever I put D.shadowSoft(5), nothing changes

I will check when I'm back home in 1-2 days. However please make sure you ran all steps in engine builder :
Compile engine
Copy headers
Copy engine pak
Compiler editor

Yes, I double check all checkboxes in Engine Builder, everything is checked as default, and I just click do "selected"

Hello,
I came back,
Checked in Editor and in my Game, however I don't have this problem.