於 week15

 

week15

第一步

去https://jsyeh.org/3dcg10/下載window跟 data

把data放入windows

開啟projection

開始測試

*改變up

安裝git 

安裝git並打開git bash

開新的glut專案

把檔案放到桌面的2023graphicsb

使用之前的freeglut

了解LookAt

week15-1

...

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);

    glutPostOverlayRedisplay();

}

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

{

    glutInit(&argc, argv);

    glutInitWindowSize(640,480);

    glutInitWindowPosition(10,10);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutMotionFunc(motion);

    glutReshapeFunc(resize);

    glutDisplayFunc(display);

    glutKeyboardFunc(key);

    glutIdleFunc(idle);

...

投影

week15-2

測試 

 1.臺狀投影glFrustum() 

        

  2.垂直投影glOriho()

 

3.透視投影gluPerspective

...

static void resize(int width, int height)

{   ///aspective ratio長寬比

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

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);///切換成投影矩陣

    glLoadIdentity();

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

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

    gluPerspective(60, ar, 0.01, 1000);

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

    glLoadIdentity() ;///設成單位矩陣

}

...

week15-3

透視投影

#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);

    glutPostOverlayRedisplay();

}

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

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week15");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

week15-4

#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);

    glutPostOverlayRedisplay();

}

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_PROJECTION);

    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();

}