Hi, There is another excellent texture pack called
[G1] Medarion Texture Pack. It has full widescreen support with new artwork for the menu, interface, chapters and loading screens. It has great characters, NPCs, enemies, armor and weapon textures, and the world textures looks like a HD version of the original Gothic (the Riisis TextureMix is great but looks too dark sometimes).
I don't think you would need HDR Enabled with this texture pack. And by the way, I don't think you need to start the game from scratch, if you kept your saved games they should work with most mods.
Here's the Mod's page, it's in Polish, so it needs to be translated. It had a ton of pictures and the download link will take you to a mega.nz account with a bunch of files to download:
https://www.bractwospolszczenia.pl/showthread.php?tid=1007&pid=32760#pid32760 You should download these files and extract them to the
Gothic\data folder.
G1_Medarion_Texturespack.zip
G1_Medarion_Texturespatch_DX11.zip
G1_New_Run_Anims.rar
FONT_G2.rar
About Riisis TextureMix, you don't need to delete it, just rename it from *.vdf to *.vd- and you could rename it back if you decide to delete the Medarion Texture Pack files.
EDIT: Previous link is dead. Here's new working links
[G1] Medarion Textures Pack (page is in polish, you'd need some browser translation plug-in like TWP to translate).
https://themodders.org/index.php?topic=31838.0 Download Link https://mega.nz/folder/Bz4mjAzb#QzPlM53SaLvWZByWTtkkMw