I've downloaded some of the fantastic track texture updates by ClimaxF1 in the last time.
www.overtake.gg
But as the DDS files are uncompressed, they really need too much disc space and the installation with content manager just doubles the needed disc space. As I see absolutely no difference between uncompressed and compressed track textures in a racing game, so I was looking for an easy way to batch convert these DDS files to DXT5 without mipmaps to save 75% of the disc space. But none of the normal graphics programs like GIMP, PAINT.NET or IRFANVIEW has a function to batch convert DDS files.
After some search a found the tool "ImageMagick", that does a batch conversion of DDS files. But you have to do it with a command line or a BAT-file.
ImageMagick is a powerful, open-source software suite for creating, editing, converting, and manipulating images in over 200 formats. Ideal for web developers, graphic designers, and researchers, it offers versatile tools for image processing, including batch processing, format conversion, and...
imagemagick.org
First install the program on your PC, then create a new TXT-file and copy the following text to it and save it.
C:\Programs\ImageMagick-7.1.1-Q16-HDRI\magick mogrify -format dds -define dds:mipmaps=0 -define dds:compression=dtx5 *.dds
(Note: "C:\Programs\ImageMagick-7.1.1-Q16-HDRI" has to be the installation path on your personal PC. Maybe, you have to change it, if you have installed ImageMagick somewhere else)
In the next step you have to rename the TXT-File to something like "convert_dds.bat" (or what you like).
If your TXT-File has no .txt extension, you have to activate "show file extensions for known file types" in Windows Explorer first.
Now you can copy the BAT-file to the folder with the uncompressed DDS-files and start it with a double-click. The conversion process can take some time, if there are a lot of DDS-files in the folder. Of course you can also use the BAT-file in skin folders with large uncompressed car skin DDS-files. (do we really need a single skin folder with more than 300 MB in a racing game like AC? This means 9 GB for a field with 30 cars).
If you want to create the DDS-files with mipmaps, just change "dds:mipmaps=0" to "dds:mipmaps=1" in the BAT-file. This increases the resulting file size by 25% and I don't think, that the game needs mipmaps any more as they are automatically created at the start of a race. But maybe someone else has more information about that. By the way RSS doesn't use mipmaps for their skins anymore.
I hope this helps a little bit to save some of the limited disc space on your SSD and will increase the performance of the game on low end PCs.