The applications of 3-D realistic terrain display to the terrain structure comprehension, geographic data analysis and spacial decision,etc are very important and have received a great deal of attention,However,because of the irregularity and complexity of natural terrain surface′s texture details,the realistic terrain display is one of the most challengingproblems in computer graphics.

He put forward "five wishes" and established "Special Cultivation Abbey with a view to educating personnel for running the country and dreamed of uniting the nation with Taoism.