Multi-resolution Representation of 3D Complex Building Model with Features Preservation

We propose a method for multi-resolution representation of 3D complex building model with features preservation based on improved volumetric techniques.Firstly,the polygonal model of 3D complex building is converted into volumetric representation,and the voxels are stored in an octree.Then,various resolution cell models can be generated by clustering the octree cells with a basis on quadratic error metric.Finally,the multi-resolution isosurfaces are extracted and the features are reproduced using normals as expected LOD models.The experimental results show that the proposed method has the characteristics of less calculation and better ability of preserving main structure features of original building.