则分别以点 为三角形顶点计算面积并求和即可。
Point of the triangle is the vertex of each area and the sum can be calculated.
首先我们需要对每个三角形顶点法线，但如何实现这一目标？
At first we need to get normals for each triangle vertex, but how to achieve this?
在读入步骤1的饼图后，将在步骤1的图表中绘制由三角形顶点文件指定的多边形。
After reading in the Step 1 pie chart, polygons specified by the triangle vertices file are drawn on the Step 1 chart.
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