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Vray Normal Map issues

KristianBonne
vertex
Hi people,

So im getting very strange artefacts when using normal maps(tangent space) in vray/maya. Check out the images below and notice the rendering of the vehicle:


(with normal maps)


(without normal maps)


The strange thing is that the normal maps render fine in the vehicles' own scene file but whenever I import or reference it into another scene the artefacts appear.
This is how it looks in the original file:

Notice the breakup of panels and the glossiness highlight, this is how its actually supposed to react.


Does anyone know what this is and how to deal with it ? 
Many thanks in advance!
- Kristian


System:
Windows 10
Maya 2016.5
Vray 3.4.3

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