I am trying to create a 3D TIN surface from a xyz file where buildings polygons are included in the surface, i..e where there are buildings, the surface extrudes up x metres then drops back down again to continue across the natural terrain from the xyz file.
My issues is that I do not know how to tell FME to not triangulate between buildings. This has the effect of slicing up other buildings in between buildings, even if I exclude the xyz file, see below, I do not want the light blue lines crosing the dark blue polygons.
I essentially want the buildings to be interior boundaries where there is no triangulation. Can anyone help? Thank you.