Large Box Lightning Glitch

Development World Creation
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1

Ive got a strange glitch, when i make a large Substractive box inside a box ive got some sky lightning comming trought at the other end, when i move close to it its gone and it reappears on the other side.

the settings of the box:

http://www.gjdwebserver.nl/public/Police%20Chief/Ask/Sub_box_lightning_settings.png

http://www.gjdwebserver.nl/public/Police%20Chief/Ask/Sub_box_settings.png

The glitch itself (see the white area at the end)

In normal lightning:

http://www.gjdwebserver.nl/public/Police%20Chief/Ask/glitch_1.png

Detailed Lightning:

http://www.gjdwebserver.nl/public/Police%20Chief/Ask/glitch_2.png

Lightmap Density:

http://www.gjdwebserver.nl/public/Police%20Chief/Ask/glitch_3.png

Anyone knows what is happening?

2

Check out this thread:

3

Forum page did not really resolve my issue, the box is allready 200px deep into the ground, and surrounded by an other box.

only way to solve it for me is to disable Sun Shadows or just increase the Dynamic Shadow Limit to such an high number there is no shadow at all.

I would assume there is a better sollution since the box in questing is surrounded by other stuff… there should be no sunlight at that point.