thanks for your response. I’ve used the Extrude Between method in the past too, but like you said, once the building reaches that second tier, it has no break line to enforce clean facades. I wish there was a tool that would use the slope and aspect rasters of your LAS to automatically recognize where to force clean wall facades in the final multi patch. TerraScan does a better job at this.
out of curiosity, why do the buildings in your first screenshot not have more triangulation if you only used the extrude between tool? it looks like there are very few points it’s connecting. Did you sub-sample the TIN’s or only model key points or something?