15binggreen

 https://jsyeh.org/3dcg10/ 下載 data win32 把data放在windows裡面

gluLookAt <eye 控制鏡頭視角 x控制左右 y控制上下 x控制遠近

center 是鏡頭中心點座標

up 橫拍或直拍

week15-1_gluLookAt 加鏡頭

float eyeX =0,eyeY=0; void motion(int x,int y){ ///加motion eyeX = 3*(x-320)/320.0;///算eyeX的座標 eyeY=3*(240-y)/240.0;///算eyeY的座標 glLoadIdentity(); gluLookAt(eyeX,eyeY,-3,0,0,-6, 0,1,0); /// EYE位置 中間主角 UP向量 glutPostRedisplay(); }

fov field of veiw(y方向) 視野張開的角度

aspect aspect ratio 長寬比

week15-2_glutPersprctive

glOrtho(-ar*3,ar*3,-1.0*3,1.0*3,2.0,100.0);

gluPerspective(60,ar,0.01,1000);

week15-3_perspective_glulookat

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x,int y)

{

    glLoadIdentity();

    float eyeX=(x-150)/150.0,eyeY=(150-y)/150.0;

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

    glutPostRedisplay();

}

void reshape(int w,int h)

{

    float ar =w /(float) h;

    glViewport(0,0,w,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);

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week15");

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}