Transfer functions in volume rendering of lake water quality using concentration frequency distribution
2022
He, Wangjun | Yuan, Alan | Gu, Xianyong | Liao, Zhenliang
In exploring pollutant distribution and diffusion in lakes, the volume rendering technique is used for visualizing the lake water quality model in three dimensions. The vital perspective expression of subtle differences in the volume rendering is difficult because of the narrow distribution ranges and small spatial differences of the scalar field of the lake water quality model. Hence, we proposed transfer functions for the volume rendering of lake water quality using the concentration frequency distribution. The concentration frequency distribution of the lake water quality scalar field was counted, voxel ratios and coloring probabilities of the frequency ranges were calculated, and voxel values were effectively mapped to colors and transparencies according to the coloring probabilities. Thus, a refined expression was achieved for the differences in the spatial distribution of lake water quality. Experiments showed that the proposed method improved the perspective expression of the subtle differences in the lake (especially shallow lakes) water quality. The proposed method is effective for analyzing the characteristics and change behaviors of the lake water quality model.
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