Watertight Scenes from Urban LiDAR and Planar Surfaces
Article first published online: 19 AUG 2013
© 2013 The Author(s) Computer Graphics Forum © 2013 The Eurographics Association and John Wiley & Sons Ltd.
Computer Graphics Forum
Volume 32, Issue 5, pages 217–228, August 2013
How to Cite
van Kreveld, M., van Lankveld, T. and Veltkamp, R. C. (2013), Watertight Scenes from Urban LiDAR and Planar Surfaces. Computer Graphics Forum, 32: 217–228. doi: 10.1111/cgf.12188
- Issue published online: 19 AUG 2013
- Article first published online: 19 AUG 2013
- Computer Graphics [I.3.5]: Computational Geometry and Object Modeling—Geometric algorithms: Surface and solid representations;
- Computer Graphics [I.3.7]: Three-dimensional Graphics and Realism—Visible line/surface algorithms
The demand for large geometric models is increasing, especially of urban environments. This has resulted in production of massive point cloud data from images or LiDAR. Visualization and further processing generally require a detailed, yet concise representation of the scene's surfaces. Related work generally either approximates the data with the risk of over-smoothing, or interpolates the data with excessive detail. Many surfaces in urban scenes can be modeled more concisely by planar approximations. We present a method that combines these polygons into a watertight model. The polygon-based shape is closed with free-form meshes based on visibility information. To achieve this, we divide 3-space into inside and outside volumes by combining a constrained Delaunay tetrahedralization with a graph-cut. We compare our method with related work on several large urban LiDAR data sets. We construct similar shapes with a third fewer triangles to model the scenes. Additionally, our results are more visually pleasing and closer to a human modeler's description of urban scenes using simple boxes.