大吃七斤Week07

week07

從老師給的網址( https://jsyeh.org/3dcg10/ )下載windows.zip和data.zip，解壓縮後把data資料夾中的data放入windows的資料夾，後開啟windows裡的Texture.exe

通常是右手座標系統(4個頂點是逆時針繞)

0到1之間重複，有時會改設成左右上下鏡射，有時候直接拿0或1的值

jsyeh.org/gl/opengl_10_func.html

glPushMatrix();//備份矩陣
    glTranslatef(x,y,z);//移動
    glRotatef(angle,x,y,z);//轉動
    glScalef(x,y,z);//縮放
    glBegin(GL_POLYGON);//開始畫
        glColor3f(r,g,b);//色彩
        glTexCoord2f(tx,ty);//貼圖座標
        glNormal3f(nx,ny,nz);//打光的法向量
        glVertex2f(x,y);//頂點
    glEnd();//結束畫
glPopMatrix();//還原矩陣

從2022葉正聖老師上課軟體安裝 OpenCV-2.1.0-win32-vs2008.exe 要注意以下選項

不能改位置

從Settings ==>  Compiler settings 

Search dirctories ==> Compiler 目錄加入 C:\OpenCV2.1\include

                                    Linker 目錄加入 C:\OpenCV2.1\lib

 Linker settings 加入 cv210  cxcore210  highgui210 三個

week07-1_opencv_cvLoadImage

檔名一定要.cpp

#include <opencv/highgui.h>

int main()

{

    IplImage * img = cvLoadImage("image.jpg"); ///圖檔要放桌面

    cvShowImage("Week07",img);

    cvWaitKey(0);

}

week07-2_myTexture

從 https://gist.github.com/jsyeh(myTexture.cpp)複製程式碼，earth.jpg(myEarth.cpp)要放在桌面/freeglut/bin裡面

#include <opencv/highgui.h> ///使用 OpenCV 2.1 比較簡單, 只要用 High GUI 即可

#include <opencv/cv.h>

#include <GL/glut.h>

int myTexture(char * filename)

{

    IplImage * img = cvLoadImage(filename); ///OpenCV讀圖

    cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)

    glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能

    GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID

    glGenTextures(1, &id); /// 產生Generate 貼圖ID

    glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點

    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);

    glBegin(GL_POLYGON);

        glTexCoord2f(0,0); glVertex2f(-1,+1);

        glTexCoord2f(1,0); glVertex2f(+1,+1);

        glTexCoord2f(1,1); glVertex2f(+1,-1);

        glTexCoord2f(0,1); glVertex2f(-1,-1);

    glEnd();

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week09 texture");

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    glutMainLoop();

}

增加

glBegin(GL_POLYGON);

        glTexCoord2f(0,0); glVertex2f(-1,+1);

        glTexCoord2f(1,0); glVertex2f(+1,+1);

        glTexCoord2f(1,1); glVertex2f(+1,-1);

        glTexCoord2f(0,1); glVertex2f(-1,-1);

glEnd();

week07-3_myEarth

從 https://gist.github.com/jsyeh(myEarth.cpp)複製程式碼，earth.jpg(myEarth.cpp)要放在桌面/freeglut/bin裡面

#include <opencv/highgui.h> ///使用 OpenCV 2.1 比較簡單, 只要用 High GUI 即可

#include <opencv/cv.h>

#include <GL/glut.h>

GLUquadric * sphere = NULL;///一個指到二次曲面的指標

int myTexture(char * filename)

{

    IplImage * img = cvLoadImage(filename); ///OpenCV讀圖

    cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)

    glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能

    GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID

    glGenTextures(1, &id); /// 產生Generate 貼圖ID

    glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點

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

    return id;

}

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle, 0,-1,0);

        glRotatef(90, 1,0,0);

        gluQuadricTexture(sphere, 1);

        gluSphere(sphere, 1, 30, 30);///glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week07 texture background");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    sphere = gluNewQuadric();

    glEnable(GL_DEPTH_TEST);

    glutMainLoop();

}