Rapid dynamic drafting method of magnanimity digital terrain

Abstract

The invention discloses a method for drawing a mass digital landform quickly and dynamically, which comprises the following steps: subdividing an original mass digital DEM landform model into standard landform blocks and storing the standard landform blocks in a computer external memory; generating a memory data structure which comprises four parts including a core landform block set, a transverse landform block set, a longitudinal landform block set, and a multi-resolution auxiliary structure of the core landform block set; scheduling data, which includes pre-scheduling, block updating and pre-reservation; and generating a multi-resolution landform mesh, and finally sending the generated landform triangular mesh to a rendering pipeline to achieve the landform drawing. The method achievesthe dynamic drawing of an ultra large scale landform. The related data structure is comparatively simple and the computational process is easy to achieve. The transitional problem of continuous LOD between the landform blocks is solved naturally. The dynamic extension of the landform in the process of drawing the landform is achieved.

Description

A Fast Dynamic Rendering Method for Massive Digital Terrain technical field The invention discloses a fast dynamic rendering method for massive digital terrain, belonging to the technical field of digital terrain rendering. Background technique Various mass terrain rendering methods are disclosed in the prior art. A massive terrain rendering method based on the combination of terrain block pyramid model and linear quadtree indexing technology (Dai Chenguang et al. Real-time visualization algorithm for massive terrain data. Journal of Computer-Aided Design and Graphics, 2004, 16(11): 1604- 1607). In this method, the original terrain data is used as the bottom layer of the pyramid, and then the complete terrain block pyramid structure is generated by data compression, and then the quadtree is used to construct the terrain block index and manage the terrain data. The pyramid structure used in this method for managing terrain data is built on the entire terrain. When the ter...

AI Technical Summary

Problems solved by technology

This technology has high execution efficiency, but because it requires special graphics acceleration hardware support, it is still difficult to popularize and apply

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