Well, Im posting those two images again with some changes.
The areas marked in blue - it should really not be possible to penetrate them with AT rifles. The armor in real tanks is either too thick, too sloped or usually both. Those areas were designed to withstand rounds from (smaller calliber) AT guns. AT rifle should be useless agains them.
And (with exeption of T-34's front turret) the blue areas should be also AT-rifle proof in game, when looking at the armor stats and ballistic calcs. At this thickness/angle combination, no AT rifle should penetrate them in game.
Maybe some tweaks in collision models are needed...
Especially bugs me the T-34 turret front (mantlet) ! It may some kind of error.
And the areas on T-34 upper front hull plate in the upper corners.
It's just solid and heavily angled 45mm plate, absolutely no reason for 14mm bullet to penetrate it.
Some 14mm bullet achieves what 50mm AT gun can't ?
Well, maybe the rear inspection hatch in T-34 couldbe vunerable under some conditions - conditions being that the gunner tan hit the very edges of the hatch and get a beter (almost 90deg) hit angle.
No AT rifle also was able to penetrate the angled (upper) side armor or rear armor or sides of the turret, can't remember what was the thickness of the rear of the turret, but I believe it was also quite thick, similar to the side armor.
The yellow area on T-34 diagram is where the main ammo store really is
. There are also smaller ammo stores (located on the sides below the turret), and also lot's of fuel tanks, but hitting them don't make so much damage as the ammo does.
The ammo/fuel/engine diagrams from RO1 - well they are very basic and give only a very general knowledge of where to aim in RO2.
The ammo/fuel/crewman/sensitive gear locations in RO2 are much more realistic (they have different shape, size and positions than in RO1, instead of one or two huge ones, there are several smaller ammo stores and hitboxes for other stuff) and - in general - they are just where they should be. Just like in real tanks.
The German version of the PTRS (PzB784r) has (in game) more penetration power than Russian PTRS. In the other case, it would be useless (as it really was) because it would be uncapable at in penetrating any part of T-34 front/side/rear armour which is at least 40mm thick. It could be the used only for hunting vision slits and for damaging sensitive stuff.
P.S. Could someone confirm or deny, that the front hull machinegun port in T-34 can be penetrated with PzB784r AT rifle ? It would be interesting to know.
The PZIV front hull machinegun should not be penetrable any easier than the rest of the front plate, AFAIK. There is no reason for that.