Europa Universalis IV

Europa Universalis IV

489 ratings
Ad Lucem
File Size
69.440 MB
Aug 7, 2018 @ 1:20pm
May 2, 2023 @ 4:36am
15 Change Notes ( view )

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Ad Lucem

In 1 collection by Borsch
Borsch's EU4 Mod Emporium
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🎉 Ad Lucem has been updated for 1.35!
This update brings no new additions to the mod.

New releases!

⚠️Attention Linux users!⚠️
If you are experiencing issues with this mod while playing on Linux, set PARALLAX, REPLACE_WATER_TEXTURE and WAVES in the mod's constants.fxh file to false and FOW_FLAT to true in constants.fxh, to see if it makes any difference. It has been reported that these tweaks fix the hard lockups (see the discussion below).

Ad Lucem, the long-anticipated graphical enhancement mod, makes its way to the Steam Workshop. Not alike any other, this modification features plethora of changes to the game's appearance, making it look better than ever before:
  • New terrain textures
  • Tone & Parallax Mapping
  • Improved shadow blur
  • Improved snow
  • Improved province highlight shader
  • False colors []
  • Fancy Fog of War
  • New water shader

📢This mod was made by skenera. Borsch only maintains the workshop page.

Ad Lucem offers a variety of customization options
which you can tailor to your needs by changing specific values in the mod files. To begin, go to:
Then open:
gfx/FX/constants.fxh - Open this file using software of your choosing, I recommend Notepad++.
Using the following table, change the listed settings as you please:

Due to the structure of Ad Lucem, only few graphical mods are incompatible with it. You will run into no issues with any mods changing the world map graphics files - Beyond Typus looks great with Ad Lucem enabled, however MEIOU is incompatible, unless you use a patch, which you can get here.[]

However, this mod is incompatible with other ones like: Revolutionary Borders Mod, Europa Reborn, Theatrum Orbis Terrarum, etc.

Original EU4 Reddit post - Manual Ad Lucem download links for 1.28, 1.29 and 1.30, as well as a standalone province selection effect mod.

Screenshots were taken with the Simple Borders addon, which can be downloaded from the link below: Simple Borders addon

Disclaimer: I do not own this mod. Ad Lucem was uploaded to EU4 Steam Workshop in courtesy of its original creator, skenera.
Popular Discussions View All (1)
May 2, 2023 @ 5:07pm
Hard lockup on linux when using this in combination with basicaaly any other mod
Војвода Рачић Jul 11 @ 10:13am 
Thank you
Borsch  [author] Jul 10 @ 11:41am 
@Војвода Рачић since there are no reports of issues, it should be working as intended.
Војвода Рачић Jul 10 @ 7:06am 
Greetings! Is this mod working with the newest version?
sbradley0 Apr 27 @ 5:32am 
I love the Fog of War, would be amazing if it were standalone like the Water Only version.
proteus06 Feb 21 @ 2:28pm 
@skenera my apologies for the delayed response, that definitely fixed the problem, thank you so much for the mod as well as the fix, appreciate it!
skenera  [author] Feb 1 @ 10:02am 
@proteus06 Set PARALLAX to false in constants.fxh, I must have made a mistake that only affects OpenGL.
proteus06 Jan 31 @ 2:19pm 
@Borsh just tested with only Ad Lucem loaded and unfortunately it does seem to happen with only that one loaded. Weirdly, if you don't try to move too fast it seems to recover itself for a bit as it will lag and then start moving again. Seems to be related to zooming in after you've zoomed out. However, if you try and move too much it'll lock up entirely.
Borsch  [author] Jan 31 @ 2:10pm 
@proteus06 Does this also happen when Ad Lucem is the only loaded mod?
proteus06 Jan 31 @ 11:59am 
Great mod, however, on macOS it seems to cause the game to crash, not a huge deal as I can switch to Windows, but just wanted to share. The issue seems to be related to zooming in and out as that will consistently reproduce a game crash. I use all the same mods on Windows as macOS if that helps (GMI, The Great Exhibition, Doge's Ironman compatible tweaks, HRE Ironman rework). Thanks for the mod, appreciate your time and efforts!
skenera  [author] Dec 30, 2023 @ 3:59pm 
I have no objection to the addition of these two parameters.