電腦圖學week09筆記

前置作業

(1) 到 jsyeh.org/3dcg10 下載

windows.zip => 解壓縮 windows\Texture.exe

data.zip => 解壓縮 windows\data\圖檔

source.zip => 解壓縮

(2) 到 moodle 下載 opencv 2.1.0 win32 vs2008 

開始做

開啟一個新檔案，檔案名稱 week09_opencv.cpp 

今天的第一個程式

#include <opencv/highgui.h> 

int main()

{

IplImage * img = cvLoadImage("檔名.png"); 

cvShowImage( "week09", img ); 

cvWaitKey( 0 );

}

做好後，去設定 

1. Settings => compiler => Search directories => Compiler

2. Settings => compiler => Search directories => Linker

3. Settings => compiler => Linker settings

完成

結合 OpenCV 和 OpenGL

開啟一個新Project，檔案名稱 week09_texture

程式碼

#include <GL/glut.h>

#include <opencv/highgui.h>

void myTexture()

{

    IplImage * img = cvLoadImage("sky.png");

    cvShowImage("opencv", img);

}

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("week09 texture");

    glutDisplayFunc(display);

    myTexture();

    glutMainLoop();

}

(貼圖和茶壺分開)

#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("week09 texture");

    glutDisplayFunc(display);

    myTexture("sky.png");

    glutMainLoop();

}

(進行貼圖的設定，把圖片印到茶壺上)