I am doing a game with no textures, there is only one problem now, when i use one Directional light with shadows, it is obviously working outside of shadows, but in shadows, objects are only silhouettes (image 1 ). I had working solution from here, to add two directional lights (in opposite direction to each other ) with no shadows to have light in shadows of main Directional light. It worked (image 2 ) but it cuts performance. Like, i am not suprised, but is there any other way to get depth to objects in shadows ?
For example when i look at same building in same angle and position, with no lights 125fps, with only main directional light with hard shadows of medium resolution 50fps, with only secondary directional lights with no shadows 70fps (there are 2 of them) , with both main and secondary lights 30fps.