3D city model 3D modeling 1 3d city model 1 AEC 1 Augmented reality 1 Augmented reality applications 1 City model 1 CityGML 1 HoloLens 1 Hololens 1 Mesh generation 1 Mixed reality 1 Mobile augmented reality 1 Occlusion 1 Occlusion handling 1 Three dimensional computer graphics 1 augmented reality 1 mixed reality 1 occlusion 1 urban planning 1