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开发平台：

Visual C++

afVec3n.cpp：源码内容

							#include "afVec3n.h"
#include <math.h>
#pragma warning(disable: 4514)
afVec3n afVec3n::ORIGIN(0.0f,0.0f,0.0f);
afVec3n afVec3n::FRONT(0.0f,0.0f,1.0f);
afVec3n afVec3n::BACK(0.0f,0.0f,-1.0f);
afVec3n afVec3n::LEFT(-1.0f,0.0f,0.0f);
afVec3n afVec3n::RIGHT(1.0f,0.0f,0.0f);
afVec3n afVec3n::UP(0.0f,1.0f,0.0f);
afVec3n afVec3n::DOWN(0.0f,-1.0f,0.0f);
void afVec3n::set(float nX, float nY, float nZ)
{
	x=nX;
	y=nY;
	z=nZ;
	
	float l = length();
	if(l!=0.0f)
	{
		float il = 1.0f / l;
		x *= il;
		y *= il;
		z *= il;
		valid = true;
	}
	else
		valid = false;
}
const afVec3n& afVec3n::getDifferentVector() const
{
	if(fabs(*this * afVec3n::LEFT)<0.99)
		return afVec3n::LEFT;
	else
		return afVec3n::DOWN;
}

						