对于烟雾的渲染，利用两次光线投射的方法，得到了很好的烟雾效果。
For the smoke rendering, we take the approach of ray-tracing twice and achieve satisfactory results.
实验结果表明本文算法既可以增强传统光线投射算法的绘制效果，也可以加快算法的速度。
The results of Experimental show that the algorithm can not only enhance the effect of traditional ray-casting algorithm, but also accelerate the speed of the algorithm.
实验结果表明本文算法既可以增强传统光线投射算法的绘制效果，也可以加快算法的速度。
The results of Experimental show that the algorithm can not only enhance the effect of traditional ray-casting algorithm, but also accelerate the speed of the algorithm.
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