Unity环境下获取一个点在线段上的投影点

不同位置的点P在线段AB的投影图示如下：

代码参考如下： 

	static public Vector3 GetPointProjectOnSegment(Vector3 point, Vector3 pSegA, Vector3 pSegB)
	{
		Vector3 AB = pSegB - pSegA;
		Vector3 AP = point - pSegA;
		float t = Vector3.Dot(AP, AB) / Vector3.Dot(AB, AB);
		Vector3 projection;
		if (t < 0)
		{
			projection = pSegA;
		}
		else if (t > 1)
		{
			projection = pSegB;
		}
		else
		{
			projection = pSegA + t * AB;
		}
		return projection;
	}