(圖學筆記)電腦圖學Week10

 

電腦圖學_week10

step01-1. 將上週的 texture 和上上周的 model 結合並使用期中考時寫到的 glBegin(GL_POLYGON) 畫多邊形

用 glTexCrood2f() 和 glVertex2f() 做出背景貼圖

#include <opencv/highgui.h>

#include <opencv/cv.h>

#include <GL/glut.h>

int myTexture(char * filename)

{

    IplImage * img = cvLoadImage(filename);

    cvCvtColor(img,img, CV_BGR2RGB);

    glEnable(GL_TEXTURE_2D);

    GLuint id;

    glGenTextures(1, &id);

    glBindTexture(GL_TEXTURE_2D, id);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);

    return id;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    glutMainLoop();

}

step01-2. GLUquadric * sphere = NULL; 宣告

          gluSphere 做出一個圓球

          把圖貼到圓球上

#include <opencv/highgui.h>

#include <opencv/cv.h>

#include <GL/glut.h>

GLUquadric * sphere = NULL;

int myTexture(char * filename)

{

    IplImage * img = cvLoadImage(filename);

    cvCvtColor(img,img, CV_BGR2RGB);

    glEnable(GL_TEXTURE_2D);

    GLuint id;

    glGenTextures(1, &id);

    glBindTexture(GL_TEXTURE_2D, id);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);

    return id;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    gluQuadricTexture(sphere, 1); 

    gluSphere(sphere, 1, 30, 30); 

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    sphere = gluNewQuadric();

    glutMainLoop();

}

step01-3旋轉的地球

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef( angle, 0,0,1);

        gluQuadricTexture(sphere, 1); 

        gluSphere(sphere, 1, 30, 30); 

    glPopMatrix();

    glutSwapBuffers();

    angle+=1; 

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glutIdleFunc(display);///有空idle 呼叫 display()

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    sphere = gluNewQuadric();

    glutMainLoop();

}

# glEnable(GL_DEPTH_TEST)開啟3D深度測試功能

//前面省略

float angle=0;///旋轉角度

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(90, 1,0,0);

        glRotatef( angle, 0,0,1);

        gluQuadricTexture(sphere, 1); 

        gluSphere(sphere, 1, 30, 30);

    glPopMatrix();

    glutSwapBuffers();

    angle+=1; 

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glEnable(GL_DEPTH_TEST);

    glutIdleFunc(display);

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    sphere = gluNewQuadric();

    glutMainLoop();

}