A dynamical loading of large scale 3D city based on OSG

To dynamically load the large scaled 3D city model based on OSG (OpenSceneGraph), the model is firstly separated small blocks so as to improve the loading speed and save the memory, here we directly separate the scene along the x-axis and y-axis, then we design the algorithm to control the numbers and the positions of loading blocks, thirdly we optimize the algorithm. In the end we give the experimental result to show the virtues of our methods.