getting objects to shadow themselves from sky map lights

[logan74k]

Hi guys, new to Toolbag here. I'm looking at imported models and noticing their own geometry isnt blocking light as I'd expect. For instance inside mouths/in crevices etc. surfaces are lit as though they are fully exposed and outside of the model. Specifically the light emitted by the HDR sky maps.

Is there a way to correct this? Other than lighting exclusively using new created lights? Thanks for any tips.

[KillThemAll]

You should turn on the "Enable GI" in render settings under the Global Illumination dropdown. or Ambient occlusion in lighting dopdown list