Moveable light and recalculation

Development Rendering
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1

As far as I know, moveable light recalculates every frame the shadows and also the light.
Let us suppose we have the classical day and night life cycle with the sun light source moveable: what happen if I set for a fixed amount of time (1 hour) the moveable light to be completely stopped? Even in this case the performance are affected by the recalculation, despite there is no need to recalculate the shadows?

I’m not an UE4 dev, but my claim is the following: since in this case there is no need to recalculate, the moveable light is acting like a normal static light. Is my claim correct?

2

There are differences between static and dynamic lights… if a dynamic light doesn’t move it’s still a dynamic light so Unreal will use the calculation according to that… Static lights have BAKED lighting information (shadows and light) so it needs to be pre-calculated and can’t be changed during “gameplay”… dynamic lights go on the flow…