Converting DUDV to Normal Maps
The Problem
Has your normal map been making your texture look weird from ripped models?
The main reason is because APE converts it to a DUDV map, causing what you rip is not the raw normal map.
DUDV map:
BAD DUDV map preview when imported into radiant as a normal map: (Why it looks weird on models)
Properly Converted Normal Map: (looks like the first DUDV map again in the preview)
The Guide
Method 1 (Thanks to HitmanVere)
1. Download GIMP from
https://www.gimp.org/downloads/2. Launch GIMP. Open your image.
3. Open Brushes Window if not already open. (Window > Brushes) In the brushes window, click the Channels tab and only have the Blue Channel highlighted.
4. In the main window, Colors > Invert. (If it still looks strange, try the green channel aswell.)
5. Now to save, click File > Export As... and go to the directory you want to save and click export. Note: Make sure the name before clicking export has .tif or .tiff in the name.
Repeat 3-5 for other images.
Method 2
1. Download GIMP from
https://www.gimp.org/downloads/2. Download the Normalmap plugin from
https://code.google.com/archive/p/gimp-normalmap/downloads3. In the downloaded Normalmap archive, extract normalmap.exe to Installation Directory\GIMP 2\lib\gimp\2.0\plug-ins
4. In the downloaded Normalmap archive, extract all to .dll files to Installation Directory\GIMP 2\bin
Note: Installation Directory is normally C:\Program Files\
5. Launch GIMP. Open your image. Click on Filters > Maps > Normalmap...
6. Change conversion to "DUDV to Normal" and click OK. Your image should look like a regular normal map now.
7. Now to save, click File > Export As... and go to the directory you want to save and click export. Note: Make sure the name before clicking export has .tif or .tiff in the name.
Repeat 5-7 for any images you'd like to convert.
If anyone knows how to convert with photoshop or anything else, feel free to post here and I'll add.
Edit: With the latest Wraith update, this may no longer be needed.