Materials

[Adam Fenton]

Hopefully this is my last post for a while so I don't fill up the forum, but on the same model the materials work fine on the right side of the truck but are messed up on the left as seen in the images
https://gyazo.com/8d52884ab02eb798bc537dfa5276f5f6
https://gyazo.com/af169ad0418278b38d4c394bf43023e2

[Adam Fenton]

they are also flickering within game

[Oleg]

it's hard to say by looking at these screenshots. make sure to apply surface\Normals\Calculate tool and see whether it gives any clue.

also, flickering in game could be of two types: random "nearby used" textures appear on your model when you pass near buildings or fences, or scenery reflection flashes when you spin camera around.

random textures = game fails to find a texture you've used on a model when exported. possibly this texture is no included in .ytd file.
flashing reflection = bad normals. calculation of normals on boxy and bulky models can give bad effect. use Tools->Normals tuner (in top menu) and mix Calculation and Projection in 80% and 20% proportion.