OpenGL的gluLookAt 函数详解[转]

 1 #include "stdafx.h"
 2 #include <GL/glut.h>
 3 #include <stdlib.h>
 4 
 5 void init(void)
 6 {
 7     glClearColor (0.0, 0.0, 0.0, 0.0); //背景黑色
 8 }
 9 
10 void display(void)
11 {
12     glClear (GL_COLOR_BUFFER_BIT);
13     glColor3f (1.0, 1.0, 1.0); //画笔白色
14     
15     glLoadIdentity();  //加载单位矩阵
16     
17     gluLookAt(0.0,0.0,5.0,  0.0,0.0,0.0,  0.0,1.0,0.0);
18     glutWireTeapot(2);
19     glutSwapBuffers();
20 }
21 
22 void reshape (int w, int h)
23 {
24     glViewport (0, 0, (GLsizei) w, (GLsizei) h);
25     glMatrixMode (GL_PROJECTION);
26     glLoadIdentity ();
27     gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
28     glMatrixMode(GL_MODELVIEW);
29     glLoadIdentity();
30     gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
31 }
32 
33 int main(int argc, char** argv)
34 {
35     glutInit(&argc, argv);
36     glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
37     glutInitWindowSize (500, 500);
38     glutInitWindowPosition (100, 100);
39     glutCreateWindow (argv[0]);
40     
41     init ();
42     glutDisplayFunc(display);
43     glutReshapeFunc(reshape);
44     glutMainLoop();
45     return 0;
46 }