Good day,
let's say I have some *.fbx models which I would like to import to 3DGS. However their texture sizes are not power of 2, thus when imported to WED, textures are not shown. Anyone can suggest a tool, method or software how to batch resize and "restick" the textures without much pain? The problem is, my 3d modelling and texturing knowledge is not that strong

Hi Ostapas,
I don't have a direct answer for you, sorry. But let me offer a word of encouragement. When I am faced with a model that has a texture that is not a power of two, I export the texture, & import it to an image processing program. (I either use Irfanview, PSP or Photoshop) and convert the size to a nice power of two. Very often, as long as the texture width and height are about in the same proportion, only a little fiddling with the vertices is necessary. So, most of the time, I can do it in a few minutes.
So......... my suggestion is that you take an hour or so and experiment along these lines. You might find that you don't really need a complicated batch processing program.
Regards,

Ok, thank you