逃離電腦圖學 Week07

 https://jsyeh.org/3dcg10/
下載
data
win32

開啟texture.exe

調整glColor4f();可以改變圖片的顏色

調整glVertext3f();可以改變圖片頂點位置

調整glTexCoord2f();可以改投射材質座標

安裝OpenCV-2.1.0-win32-vs2008.exe

CodeBlock

Settings>Compiler

Compiler目錄要加 C:\OpenCV2.1\include

Link目錄要加 C:\OpenCV2.1\lib

Linker目錄要加cv210 cxcore210 highgui210

OpenCV_LoadImage

#include<opencv/highgui.h>

int main()

{

    IplImage*img=cvLoadImage("image.jpg");

    cvShowImage("week07",img);

    cvWaitKey(0);

}

MyTexture

程式碼

找一個地球的圖片

存在freeglut>bin 檔名earth.jpg

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();

MyEarth

#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("week10 texture background");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    sphere = gluNewQuadric();

    glEnable(GL_DEPTH_TEST);

    glutMainLoop();

}