Lighting issues on imported .obj [Modified UV'S]

Development Rendering
1

Hi people, I’m doing a modular scenery and when I build the lights appear a few lighting issues in several points of the scenery.

This is when I realized that the UV’s were modified by the triangulation. If I triangulate the Mesh inside MAYA occurred the same. And is affecting to the whole Static Meshes.

Is there any way to preserve the UV’s when triangulating?

f67427bd751090091b115dbb8051ff49o.png
f67427bd751090091b115dbb8051ff49o.png1519×575 269 KB

d2d798c2e6de8ddca807c92a35e87508dea4ae30.jpeg

Thanks in advance to everybody.