we discussed about large open world and lights, here a way to fake lights in a tunnel and how to control dynamic light alon a spline

Yep. I knew you would remember this old technique Fake light-mapping rules! On the other hand, dealing with UVs in wz4 requires a very special approach and causes too much pain sometimes

You example has given me this idea: since we can bake shadow directly in material than probably we can bake lights as well... What do you think?

yes I had the same idea in building this example.
i'm going to glance at.

Cool. Perhaps light multiplication is easier on hardware that way...