week1515151515

gluLookAt~~~~~~~~~~~~~~~~~~~~~~~~~~~~

前三個是eye座標

中間是CENTER座標

下面三個是可以旋轉鏡頭

 

glMatrixMode(GL_PROJECTION);切換成投影矩陣

glLoadIdentity();還原成單位矩陣

glMatrixMode(GL_MODELVIEW);切換成Model View矩陣

glLoadIdentity() ;還原成單位矩陣

可以運用+-來調整

胖茶壺

#include<GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void reshape(int w,int h){

    glViewport(0,0,w,h);

    float ar =w/(float)h;

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(60,ar,0.01,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(0,0,1  ,0,0,0  ,0,1,0);

    glutPostRedisplay();

}

int main(int argc,char** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMainLoop();

}