Landscape material light problem!

Hi everyone, im trying to work out when you set a material to the landscape and i’ve wondering, when you use a landscape blank, by my day night cycle the sun shines not through, but when
you get landscape a material the sun shines specific through some ranges of the material what im doing wrong?
Here is a picture and by the way that’s an standart material from starter pack:

Have found a solution by a youtube video, allwhat i have to do is a bit manipulate the update sun direction function in the bp_skysphereat the end of that hanging some compare nodes, hope will help others too.
Here is a picture:

Happy Developing

How is adding or subtracting 0.05 sufficient to activate the shadows?