提出了利用正四面体的某些截面表示一定组成，得出相分离曲线和相分离曲面，并能较好地描述四元体系。
Some of the cross sections are used to stand for a certain component, and semiternary phase diagrams are ploted, then a quaternary phase diagram shown in a tetrahedron is obtained.
采用曲线曲面匹配和误差分离技术对测量数据进行处理，完成了对被测件的评价。
The part is evaluated using the techniques such as curve matching, curved face matching and error separating.
为了应用计算机图形学中高效的3维物体碰撞检查的分离轴理论，对自由曲面进行八叉树建模。
In order to apply the separating axis theory, which is effective in solving 3d object collision problems in computer graphics, an octree is used to approximate the freeform surfaces.
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