OpenGL透视投影与摄像机定位

我在OpenGL中使用一些地图图像渲染场景，并直接使用地图的纬度、经度作为坐标。所以我的场景不是从0,0开始，而是上升到宽度和高度。虽然我可以看到我的多边形（非常小），但我无法通过在gluLookAt（）中更改眼睛的z值进行缩放

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对于透视图的近平面，值为0.0是不合法的。尝试将其替换为标称小值（0.1f）

另外，在代码的最后总是放一个glGetError调用，它会提醒您出现问题

/*
 * My boundary for map quad with texture
 */
#define TOP 41.9061
#define BOTTOM 41.8546
#define LEFT -87.7012
#define RIGHT -87.6054

/*
 *  window size
 */
const unsigned int window_width = 1024;
const unsigned int window_height = 739;

/*
 * drawing a polygon with texture
 */
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, mainMapTextureId);
glBegin( GL_POLYGON );   
//bottom left
glTexCoord2f( 0.0f, 1.0f );
glVertex3f(LEFT, BOTTOM, 0.0);

//bottom right
glTexCoord2f( 1.0f, 1.0f ); 
glVertex3f(RIGHT, BOTTOM, 0.0);

//top right
glTexCoord2f( 1.0f, 0.0f );
glVertex3f(RIGHT, TOP, 0.0);

//top left
glTexCoord2f( 0.0f, 0.0f ); 
glVertex3f(LEFT, TOP, 0.0);
glEnd();


/*
 * Setting up the camera
 */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, (GLfloat)window_width/(GLfloat)window_height, 0.0, 10.0);
gluLookAt( (float)(LEFT+RIGHT)/2.0, (float)(TOP+BOTTOM)/2.0, 1.0, 
               (float)(LEFT+RIGHT)/2.0, (float)(TOP+BOTTOM)/2.0, 0.0,
        0.0f, 1.0f, 0.0f);