I think CoH is working with LoDs like every new Game.
It looks like you done some of them with Multi res or something like this... With Medium Settings the Tanks looks very ugly cause of UVW issues and smoothing issues.
If you have a low Poly cylinder it is posible to smooth it, and then ich looks ok. But often then People don´t create LoDs by Hand and use Multires Modifikator all smoothing Infos get lost and it look like crap if it isn´t fixed.
Next is, is it right that you havent Wreck Textures for all Tank? IS-100 looks destroyed the same with broken track???
You forget the wreck Texture or wreck or is it a error cause of Medium Setting.
The Katjuscha has a nice Wreck Model and Skin. And right looking LoDs too.
I hope you will spent some work on this. Would be great
