week13 02160200 課堂練習

TODO:垂直投影

程式碼

#include <GL/glut.h>

void display()

{

    glPushMatrix();

        glutSolidTeapot(100);

    glPopMatrix();

    glFlush();

}

void reshape(int w,int h)

{

     glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(-w/2,w/2,-h/2,h/2,-1000,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

}

int main(int argc, char**argv)

{

    glutInit(&argc,argv);

    glutInitWindowSize(800,600);

    glutCreateWindow("3D");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMainLoop();

}

攝影機.運鏡

程式碼

#include <GL/glut.h>

float eyeX=-100,eyeY=80,eye2=-200;

void display()

{

    GLfloat pos[]={0,0,200,0};

    glLightfv(GL_LIGHT0,GL_POSITION,pos);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_LIGHTING);

    glEnable(GL_DEPTH_TEST);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        gluLookAt(eyeX,eyeY,eye2,0,0,0,0,1,0);

    glPushMatrix();

        glutSolidTeapot(100);

    glPopMatrix();

    glPopMatrix();

    glFlush();

}

void motion(int x,int y)

{

    eyeX=x-400;eyeY=300-y;

    glutPostRedisplay();

}

void reshape(int w,int h)

{

     glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(90,w/h,0.001,10000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

}

void timer(int t )

{

    glutTimerFunc(20,timer,t+1);

    eyeX+=2;

    if(eyeX>300)eyeY+=4;

    glutPostRedisplay();

}

int main(int argc, char**argv)

{

    glutInit(&argc,argv);

    glutInitWindowSize(800,600);

    glutCreateWindow("3D");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutTimerFunc(0,timer,0);

    glutMainLoop();

}