Research On Acceleration Technique Of 3D Terrain Display On Embedded System

Nowadays, real-time rendering technique for large scale terrain on embedded system is one of research hot spots, and has received extensive attention. With the development of 3D modeling techniques, the object models become more and more complex. Limited by the resources of the embedded system, the rendering speed is improved by simplifying the models of terrain, which has become the core rendering technique of Large-scale terrain.This paper expounds the basic principles of 3D terrain display, and analyses the existing acceleration models and techniques. On this base, proposeing a software-based and hardware-based geometry transformation algorithm, which is improved the performance of real-time display .The design of hardware logic and its cooperating software are completed, and the functional testing and the software debugging are also brought out, which is combined with the hardware and software. The main contents of this paper include:1. The basic flow of 3D terrain display is introduced. The modeling methods of 3D terrain are analyzed in detail.2. The data structure model based on Wavelet analysis, together with the Multi-resolution LOD models and clipping algorithm, is studied. And this paper proposes a simplified evaluation system based on the minimum distance and a scheduling and hierarchical management methods. And the functional simulation and performance comparison for each module is achieved. Based on it, the software acceleration algorithm on embedded system is realized using C program language.3. The geometry transformation algorithm is researched. The hardware-based geometry transformation algorithm and the cooperating software are designed and realized on FPGA. And the functional simulation and performance analysis of the FPGA-based algorithm is achieved.4. The function test of 3D terrain display technique based on embedded system is completed, and the terrain tendering effect of both sofeware based and hardware based is proved, then performance comparison is carried out.