Hello. I'm using directional light. And on parallel to light direction plane I have flickering artifacts (in the picture the side of cube is shaded and actually it blinks every frame, so if I move camera a little - different faces shaded differently). I don't want to use any other lightning (lambertian etc) - only pure color + shadows. And to be honest, I can't understand why there're such artifacts. And is there any way to remove shadow aliasing on sphere? I'm working with mobile so I can't afford myself bluring or even pcf.