I've got a scene with a track.
I've created a script that places light probes along the track to create a volume extending either side.
However, as the vehicle moves along the track, incorrect lighting is applied, as shown here:
It's easier to see in a video: https://youtu.be/BxRdZJvxYeY
I've tried increasing the light probe density all the way up to 1 slice/meter, but it doesn't help.
My lightmap for the terrain is 2048x2048 and I'm using 64 direct samples, 20,000 indirect. There's a little noise but it's quite smooth.
Placing a large number of spheres shows the inconsistency:
What am I doing wrong? Why am I getting light where I shouldn't and vice-versa?