Weird graphical error in custom map

[TimProzz]

Hello there,

I'm currently creating Illusions of the Dead 2 (sequel to Illusions of the Dead).
I'm working on a large exterior map. I just started working on the map.

After 1 hour of mapping I decided to give it a look in game and came accross this weird graphical glitch I've not seen before (I also have not created a map this large before).

Video: https://www.youtube.com/watch?v=5D9yhcAa0nY (sorry about the background music I was listening to)

hpl.log as attachment (for info about renderer)

There's no fog in the map (yet).
I purposely made the map really bright to make everything easier to see.
I think it has something to do with the size of the map, not sure.
I used custom entities/static objects (large outside terrain used in In Lucy's Eyes).

Does somebody know what the problem might be?

Thanks,

TimProzz

[Romulator]

Your spotlight size and radius is too big. Use multiple spotlights placed closer to your ground instead.

[TimProzz]

I only have one light at the moment (boxlight) which is in fact quite big (x=700 y=200 z=700) but no point/spotlights at the moment. I can try to resize the boxlight but I doubt it will do anything?

EDIT: Creating 2 smaller boxlight in stead of 1 big one fixed the glitch for me. Thanks Romulator for the tip

[Romulator]

Ah well, it was either gonna be a Spotlight or a Boxlight, but nonetheless, the lighting over such a drastic size is the issue. Glad you got it sorted!