The problem with lights in my clock model is that they rotate after modification of openings. I forgot the rule:

(...) if a light source intersects with a rotated part, it sounds logical to make it rotate too.

(#39691 )

Pity - I created new model and it looks good with lights on but only if openings are in their initial position (time 00:00).


There's no space inside where I could place light not intersecting with openings.

I don't know how to define part of model as a triangle mesh light (opaque panel).

I haven't found any clever utilization of "arm_on_ball" yet [;)]