方法：创意投射法。
采用改进的光线投射法渲染烟雾和云，并将整个运算映射到GPU。
We adopt improved Ray-Casting to render smoke and cloud and map the entire arithmetic process to GPU.
本文介绍了图解截交线的三种方法，中心投射法、平行斜投射法、弧线投射法。
Three approaches to the graphic representation for lines of intersection are introduced in this article, namely, central projection, parallel skew projection and arc line projection.
本研究的目的是采用访谈法、问卷法、社会测量法与投射法探讨小学生社会智力的结构。
A study was made to explore pupils social intelligence structure through interview, questionnaire, social test and projective technique.
用圆弧投射法解决圆锥曲线与其它空间几何要素的相互位置问题，可使作图更为简练、精确。
By using circular arc project, the relative positions of the conic curves and other spatial geometrical elements can be solved for simplified and precise drawings.
投射法的主要思想是根据一定投射规则，分别改变边交点和面交点的位置来避免产生不稳定四面体。
The main idea of Snapping is varying the positions of edge intersections and face intersections under certain principles to avoid producing unstable elements.
针对传统图形绘制算法速度慢，质量不高的缺点，提出了一种快速的基于光线投射法的体切割预处理方法。
To overcome the disadvantages of the traditional volume clipping algorithm, this paper proposes a fast volume clipping method based on ray-casting.
光线投射法是一种重要的体绘制算法，但直线上采样点的确定和采样值计算是非常费时的，也是影响体绘制实时性的重要因素。
Ray casting is an important algorithm in direct volume rendering, but it has the disadvantages of the large amount of computation and inefficient computation of sampling-points.
光线投射法是一种重要的体绘制算法，但直线上采样点的确定和采样值计算是非常费时的，也是影响体绘制实时性的重要因素。
Ray casting is an important algorithm in direct volume rendering, but it has the disadvantages of the large amount of computation and inefficient computation of sampling-points.
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