Correct lighting for prop in a wall.

I was wondering the best way to calculate light for something that is in the wall?
If you have not noticed before pushing a prop (or any model for that matter) into the map causes it to become black.
What is the best way to fix this, i’v tried render.ComputeLighting in many set ups and none of them return accurate results and the prop becomes really dark again.

Maybe

render.SetLightingOrigin or

render.SuppressEngineLighting

Currently cannot test as unable to use gmod, but as soon as I can I will test it, if it works thank you very much.

FWIW, lamps (projected texture) don’t exhibit this behavior.