Distorted uv maps

[Okidoki]

Also you may have a look at :

Distorted Uvs

This is because the simple (and so fastest) affine texture mapping is not “correct”… also you are mapping a rectangular sectioned texture to a non retangular surface (the inner rings are smaller than the outer so it is a non- parallelogram)… But actually not the probelm because you only see this because you are using some rectangualar texture… if you paint (especially in 3D) this thing you proberly would not see any “distortions”. You might want to use @colkai’s mentioned trick… or unwrap ever…

…so: be sure to have some subdivision.