Using QGIS, I have been unable to take a height field contained within the attribute table of a vector file, and make that height field the z-value of that point.
QGIS doesn't seem to have the ability to create/alter Z-values within the core program, I would rather not have to deal with SpatiaLite databases if I don't have to, which is the only other method I have heard mentioned.
Also tried v.to.3d as suggested here Features to 3D from 2D in QGIS
and got either an empty output, an OGR "Data source is invalid ()" message, or both. I am working with a shapefile if that is relevant.