想问一下这个函数的具体用法，谢谢，
void gluLookAt(
GLdouble eyex,
GLdouble eyey,
GLdouble eyez,
GLdouble centerx,
GLdouble centery,
GLdouble centerz,
GLdouble upx,
GLdouble upy,
GLdouble upz
);它里面的参数都是什么意思，The position of the eye point（GLdouble eyex,GLdouble eyey,GLdouble eyez,）什么意思啊，还有下面的几个参数，请帮助解析一下，谢谢

前头三个参数为你眼睛的位置，中间三个参数为你要看的那个位置的中心，最后三个参数为那个方向是向上的（如果你是站着的，Ｙ轴正是向上的．如果你是睡着的Ｘ，Ｚ就有一个是向上的，想象一下吧）。

谢谢

怎样在VC中判断我按下了方向键，比如说我想在长按向上键的时候，给一个参数不断复值，比如说i+=10什么的，谢谢

确定是否按下方向键有多个函数GetAsyncKeyState(vk_ code);, OpenGL的glutKeyboadFunc(void(*func)(unsigned char key, int x, int y));, 还有DX的DInput.

那要怎 么用这个函数呢，能说一下吗，是不是KEY_DOWN=GetAsyncKeyState(vk_ code);然后if (KEY_DOWN=键的ASCII码）{i+=4}这样啊，这样好像不行啊，请指点，谢谢

if(GetAsyncKeyState(VK_DOWN) == -32767)
i+=4;

32767这个是什么啊

#define KEY_DOWN(vk_code)((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)

然后
BOOL baiscobj::DisplayScene()
{
float speed=0.2f;
if (KEY_DOWN(VK_SHIFT)) speed =speed*4;
if (KEY_DOWN(VK_LEFT)) g_Angle-=speed*2;
if (KEY_DOWN(VK_RIGHT)) g_Angle+=speed*2;
rad_xz = float (3.13149* g_Angle/180.0f);
if (KEY_DOWN(33)) g_elev +=0.2f;
if (KEY_DOWN(34)) g_elev -=0.2f;
if (g_elev<-100) g_elev =-100;
if (g_elev> 100) g_elev = 100;
if (KEY_DOWN(VK_UP))
{ g_eye[2]+=sin(rad_xz)*speed;
g_eye[0]+=cos(rad_xz)*speed;
}
if (KEY_DOWN(VK_DOWN))
{ g_eye[2]-=sin(rad_xz)*speed;
g_eye[0]-=cos(rad_xz)*speed;
}
g_eye[1] =1.8;

g_look[0] = float(g_eye[0] + 100*cos(rad_xz));
g_look[2] = float(g_eye[2] + 100*sin(rad_xz));
g_look[1] = g_eye[1];

gluLookAt(g_eye[0],g_eye[1],g_eye[2],g_look[0],g_look[1]+g_elev,g_look[2],0.0,1.0,0.0);
return TRUE;
}不明白if (KEY_DOWN(33)) g_elev +=0.2f;中33是什么东西，呵，请教一下！

gluLookAt(g_eye[0],g_eye[1],g_eye[2],g_look[0],g_look[1]+g_elev,g_look[2],0.0,1.0,0.0);

g_elev是在这里使用的，所g_elev+=0.0f;是调节目标位置的高低度的．33是VK_PRIOR,34是VK_NEXT(分别是Page Up键与PageDown键）.