I had to revive this thread since i am working on a project that requires this.
Is there any way this can be achieved inside UE4 with forward rendering?
I was able to create this effect inside unity 3d using node based material through shader forge and make it work just fine, in my scene my sunlight or any other light source can cast shadows onto the entire unlit surfaces from unlit moving objects. I can also control the shadow’s density and color to match the baked one, as well as have additive reflections onto the unlit objects, which work very well. This can be very flexible.
How can this be achieved inside UE4?