由于：用一组顶点和三角形建立与这些点网格所定义的3D网格

Given: A 3D mesh defined with a set of vertices and triangles building up the mesh with these points.

问题：找到投影任意旋转网格的二维轮廓上的任意平面

Problem: Find the 2d outline of the projected arbitrarily rotated mesh on an arbitrary plane.

的投影是容易的。挑战在于找到在平面投影三角形边的船体。我需要一些帮助，输入/指针在研究这个算法。为简单起见，我们可以假定三维边缘被投影竖直向下到xy平面上。

The projection is easy. The challenge lies in finding the "hull" of the projected triangle edges in the plane. I need some help with input/pointers on researching this algorithm. For simplicity, we can assume the 3D edges are projected straight down onto the xy plane.

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