I'm working on a dataset from an excavation collected by an ancient total station. I have a point layer with point code, xyz values and a description of the point. These points are corners of features, lines around features etc etc. They need to be converted to polygons/lines to make sense of all the different features. The problem is that this site is extremely complicated because it consists of a lot of (partial) inhumations on top of eachother. A 3d visualisation of this data would be perfect to analyse this dataset. A 3d visualisation of the points is easy using qgis2threejs. I would like to know how i add the z values from the points and add them to (to be created) polygons so i can create a 3d visualisation of the polygons?