3D打印和图形学把模型转成表面：三角形、层、路径和像素。

核心公式

A_triangle = 1/2 |(v2 - v1) x (v3 - v1)|
S_mesh = sum of triangle areas

实用示例

Example: a right triangle with base 4 and height 3 has area = 1/2 x 4 x 3 = 6.

相关资源

Use Sphere, Cylinder, Ellipsoid, and composite shapes.