week15 Camera攝影機、期末作業

 Week15攝影機

去https://jsyeh.org/3dcg10/

先下載data windows，然後解壓縮把data丟到windows打開模型

介紹:在glutlookat()最後三個參數是up的向量

前面的eye和center會決定攝影機的軸線，從eye射向center。

攝影機會照軸線再360轉動，這個是由up向量來決定的。

step2開啟專案

檔名:week15-1_gluperspective

改數值 glOrtho(-ar*3, ar*3, -1*3, 1*3, -100, +100);

程式碼:

static void resize(int width, int height)

{

    const float ar = (float) width / (float) height;

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);///切換投影矩陣

    glLoadIdentity();///還原單位矩陣

    ///glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    ///glOrtho(-ar*3, ar*3, -1*3, 1*3, -100, +100);

    gluPerspective(60,ar,0.01,1000);

    glMatrixMode(GL_MODELVIEW);///切換model view矩陣

    glLoadIdentity() ;///還原成單位矩陣

}

建一個新專案

程式碼:

#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);

    ///在0,0,1看著茶壺0,0,0 up是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();

}

胖胖的茶壺

#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);

    ///在0,0,1看著茶壺0,0,0 up是0,1,0

    glutPostRedisplay();

    }

float eyeX =0, eyeY=0;

void motion(int x,int y){

    eyeX=(x-150.0)/150.0;

    eyeY=(150.0-y)/150.0;

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    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);

    glutReshapeFunc(reshape);

    glutMainLoop();

}

滑鼠按著移動可以看到茶壺有立體感

打開final project(因安裝github當掉，所以git沒有Final Project)

導致無法做以下動作