Plane.Set3Points 设置三个点

function Set3Points (a : Vector3, b : Vector3, c : Vector3) : void

Description描述

Sets a plane using three points that lie within it. The points go around clockwise as you look down on the top surface of the plane.

使用三个点来设置平面。点环绕顺时针方向，正如看到的平面的顶面。