I used the difference procedure to create a “door” and “windows” on a single plane. (placing 3 joined cubes through the plane and using the “difference” modifier to create the apertures) After overlaying the test map the result shows unexpected lines, indicated with yellow lines, on the resulting map. I uploaded the results (Second life) and it appears to look ok.
I could use Loop cuts to get the same result but was wondering if anybody knows what is happening (the unexpected lines) and if this is going to cause issues elsewhere.
I have applied rotation and scale modifier, remove double vertices and reset origin to centre