Directional light problem with being inside a building

Unity Engine
1

Hi there…

i wrote a system wich allows me to switch between Inside/outside or between floor-by-floor without changing the scene, by simply disolve parts of my building model.

So, when the player enters a building, all Floors + Roof above 1st, get disolved. If the player enters a stair, the 2nd floor appears, or disapears when going downstairs.

This works very well - just got a problem with the directional light of the world.

See:

and this is one of the problems (see shadow outside, but player inside):

The question now:
Is there a way to avoid - that directional light affects the ground/walls/lighting inside a building with such a system??
I don´t wnat the sun to shine inside, even when i disolve the upper floors.

2

I can only thing of a bit of a cheaty way. What if you added a line to your script so when the floor dissolved it tells the directional light to no longer cast a shadow. Switch it back on when you go outside again.

light.shadows = LightShadows.None