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我在OpenGL中渲染一个带有一些地图图像的场景,并直接使用地图的lat,lon作为坐标。所以我的场景不是从0,0开始,而是上升到宽度,高度。尽管我可以看到我的多边形(非常小),但我无法通过更改gluLookAt()中的眼睛的z值来进行缩放。OpenGL透视投影和摄像机位置
/*
* 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);
非常感谢。有效。 – musa 2012-04-17 20:21:41