Accelerated terrain rendering method based on graphics processor

Abstract

The invention discloses an accelerated terrain rendering method based on a graphics processor. Not only a problem of a T-shaped crack occurring in a level of detail (LOD) rendering process can be solved effectively, but also operation resource of a central processing unit (CPU) is saved, and a processing performance of the CPU is improved due to the fact that calculation is based on the graphics processor. By means of the method, a large-scale terrain can be rendered on a computer only supporting Direct three-dimensional (3D) 9 in high quality and high performance mode, and the method can be widely applied to 3D games and virtual reality application programs. The accelerated terrain rendering method includes the following steps: dividing an original terrain image into a plurality of terrain blocks with same area; using LOD terrain rendering arithmetic, and building different LOD-level vertex buffer and index buffer; using a quad-tree to organize the whole original terrain, each leaf node corresponds to a terrain block; rendering the terrain; using a graphics processing unit (GPU) to conduct Vertex Shader programming, obtaining height value of a terrain block vertex from a height map by using a vertex texture sampling function; and modifying the height value of a vertex.

Description

[0001] technical field [0002] The invention relates to the field of graphics, in particular to a method for rendering three-dimensional terrain based on a graphics processor. Background technique [0003] Large-scale terrain rendering is an important part of virtual natural scenes. At present, the calculation method based on the central processing unit (CPU) is usually used in domestic and foreign game terrain rendering to calculate the level of detail. Although it can greatly reduce the number of triangles rendered, the disadvantage is that every Every frame needs to update the triangle data transmitted from the CPU to the GPU, occupying precious CPU resources and bus bandwidth. [0004] With the improvement of graphics algorithms and the performance of computer graphics cards in recent years, it has become possible to fully utilize the performance of graphics processing units (GPUs) to generate real-time terrain. T-shaped cracks will appear at the transition of diff...

AI Technical Summary

Problems solved by technology

Of course, this method of eliminating cracks will increase the number of drawn triangles, and will also cause performance degradation

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