劉 電腦圖學

 Week 15 Camera 攝影機、投影、運鏡

  

第一堂課

下載windows.zip  data.zip 並解壓縮

開啟檔案

gluLookAt 的九個參數可以調

安裝Git 

下載程式倉庫

開啟新的GLUT 專案 Week15-1_gluLookAt

.

新增程式碼

glutMotionFunc(motion);

float eyeX = 0, eyeY = 0;

void motion(int x, int y)

{

    eyeX = 3*(x-320)/320.0;

    eyeY = 3*(240-y)/240.0;

    glLoadIdentity();

    gluLookAt(eyeX, eyeY, 3, 0, 0, -6, 0, 1, 0);

    glutPostRedisplay();

}

第二堂課

gluPerspective(fovy, aspect, zNear, zFar)

fov:視野張開的角度

aspect:長寬比

開啟新GLUT專案 week15-2_gluPerspective

新增程式碼glOrtho(-ar*3, ar*3, -1.0*3, 1.0*3, 2.0, 100.0);

第三堂課

開啟新專案week15-3_gluPerspective_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();

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

新增程式碼

#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_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}