Mod articles
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Follow these instructions at your own risk. I recommend you back stuff up.
This information is for people who want to make their own patches or tweaks.
Tools:
GIMP - https://www.gimp.org/
GIMP DDS plugin - https://code.google.com/archive/p/gimp-dds/downloads
BIMP - https://alessandrofrancesconi.it/projects/bimp/
GIMP Normal Map plugin - https://code.google.com/archive/p/gimp-normalmap/downloads
ImageMagick - https://imagemagick.org/script/download.php
I will assume the above are properly installed.
For small numbers of files, you can load up each dds texture into GIMP, and generate a normal map by going to Filters > Map > Normalmap.
I used the following settings:
filter = 4 sample,