Optimized Wall layout for polygon-based models
For 3.1, I changed the way walls are set up if the models was created via a polygon. This means that the raster contains NoData (NaN) cells. Cells containing a elevation were each simply expressed as a quad, with a top and bottom and possibly with one or more walls. This simple rasterization method worked but lead to a gazillion "corner quads" (i.e. quads with 2 or 3 walls). And while these corners are typically nearly imperceptible in the final 3D print, I found that it was very hard on the motion system of my 3D printer to rattle along all those tiny teeth and it also took longer to print.