Method for accelerated display of invisible part by three-dimensional digital urban system model

Abstract

The invention relates to a method for accelerated display of an invisible part by a three-dimensional digital urban system model. The method comprises the following steps that first, a three-dimensional digital urban system is generated; second, a three-dimensional single body model in the geographical coordinate range of the three-dimensional digital urban system in a window is placed in a graphics card to be displayed, all data of the three-dimensional single body model are called into an internal storage, the method of light intersection is used for conducting intersection calculation with the three-dimensional single body model in the window from the viewpoint of the system window, obviously-invisible drawing elements are obtained after calculation, and only visible parts are reserved to be displayed. According to the method for accelerated display of the invisible part by the three-dimensional digital urban system model, part of content is removed from a video memory of the graphics card to be not displayed, the display burden of the graphics card can be greatly lightened, the display efficiency of the system is improved, and therefore efficient and quick system browse display is achieved. The method can further be used for lowering the requirement for system hardware, three-dimensional digital urban efficient and high-quality display can be achieved even by a common commercial PC.

Description

technical field [0001] The invention belongs to the field of three-dimensional digital city display, in particular to an accelerated display method utilizing the non-visible part of a three-dimensional digital city system model. Background technique [0002] When a traditional system displays a 3D model, it usually finds all the 3D single models within the geographical space range in the window, then transfers the 3D single models from the database into the memory, and then transfers all these models into the video memory of the graphics card for full display. The amount of data in the method is large, and the display of the graphics card will slow down when the display is displayed, and the frame drop is serious when browsing. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an accelerated display method using the non-visible part of the 3D digital city system model. The display method can...

AI Technical Summary

Problems solved by technology

[0002] When a traditional system displays a 3D model, it usually finds all the 3D single models within the geographical space range in the window, then transfers the 3D single models from the database into the memory, and then transfers all these models into the video memory of the graphics card for full display. The amount of data in the method is very large, and the system display will slow down when the graphics card is displayed, and the frame drop is serious when browsing.