两个由三角形组成的四面体之间的碰撞检测。-Composed of two triangle collision detection between tetrahedral.

试定义类TRI(三角形)及其派生类COL(三角柱体).其中三角形类可以计算三角形的面积和周长:三角柱体类可以计算柱体的体积和表面积.-Try to define classes TRI (triangle) and its derived classes COL (triangular prism) which can calculate the triangle class area and perimeter of triangle