2023電腦圖學二甲: 電腦圖學紀錄 Texture

介紹Texture

去 https://jsyeh.org/3dcg10/

下載date.zip--->解壓縮至此

下載windows.zip--->解壓縮至此啟動Texture.exe

3D的世界都用3角形，但人類比較好理解4邊形

glColor4f 調整顏色

glTexCoord2f 下面四邊形的點的上下

glVertex3f 上面四邊形的點的xyz

OpenCV專案

安裝葉正聖老師上課軟體--OpenCV程式

安裝第二步時下面兩個有add的都可以選

安裝完後重開codeblock

step1: 開啟settings--compiler

step2: 設定Search dlirectories

Compeiler--加入C:\OpenCV2.1\include

Linker--加入C:\OpenCV2.1\lib

step3:設定Linker setting

在Link libraries打上

cv210

cxcore210

highgui210

step4:File-New-Empty file

另存成week07-1_opencv_cvLoadimage_cvShowimage.cpp

放在week07資料夾

圖片image.jpg也丟在同資料夾

#include <opencv/highgui.h>
int main()
{
IplImage *img =cvLoadImage("image.jpg");
cvShowImage("week07",img);
cvWaitKey(0);
}

喵我忘記穿幹服

GLUT專案

week07-2_myTexture

去https://gist.github.com/jsyeh

複製myEarth.cpp

另存myEarth.jpg到freeglut-bin資料夾

#include <opencv/highgui.h>

#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);

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();

glutSwapBuffers();

}

int main(int argc,char**argv)

{

glutInit(&argc,argv);

glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week7 texture background");

glutIdleFunc(display);

glutDisplayFunc(display);

myTexture("myEarth.jpg");

sphere = gluNewQuadric();

glEnable(GL_DEPTH_TEST);

glutMainLoop();

}

平的世界地圖

week07-3_myEarth

同上去https://gist.github.com/jsyeh