2020電腦圖學A: Week17

安裝OpenCV

至桌面相關軟體下載 "OpenCV"

不要更改檔案儲存的預設地方

GLUT專案

先設好 "freeglut" 裡的 "libglut32.a"

把 "working_dir" 設定成小數點

更改 "Compiler" 內容

最後再複製 "freeglut" 的 "bin" 的 "freeglut.dll" 檔到你的工作目錄

改裝GLUT專案

至 "www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10" 下載 "Source"

將 "glm.c" 及 "glm.h" 複製到你的工作目錄

把複製過去的 "glm.c" 重新明明為 "glm.cpp"

至 "Moodle" 老師所提供的相關軟體中下載 "gundam.zip"

將裡面的 "Diffuse.jpg" 、"Gundam.mtl" 及 "Gundam.obj"複製到你的工作目錄

到GLUT專案裡將 "glm.cpp" 匯入

程式碼如下:

#include <GL/glut.h>

#include "glm.h" ///使用 glm的外掛

GLMmodel * model=NULL;///指標變數, 指到 3D model

static void resize(int width, int height)

{

const float ar = (float) width / (float) height;

glViewport(0, 0, width, height);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

///這個程式會從0,0,0看出去...我們的模式也會放0,0,0,衝突

glMatrixMode(GL_MODELVIEW);

glLoadIdentity() ;

gluLookAt( 0,0,2, 0,0,0, 0,1,0);///我們從0,0,2看中心

}

static void display(void)

{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();

///glutSolidTeapot(1);

///T放Teapot,等下要放 Gundam

glmDraw(model, GLM_SMOOTH|GLM_TEXTURE);///TODO:

glPopMatrix();///TODO:

glutSwapBuffers();

}

///打光留下來

const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[] = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

/* Program entry point */

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitWindowSize(640,480);

glutInitWindowPosition(10,10);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("GLUT Shapes");

glutReshapeFunc(resize);

glutDisplayFunc(display);

///刪 //glutKeyboardFunc(key);

///刪 //glutIdleFunc(idle);

///刪 glClearColor(1,1,1,1);

///刪 glEnable(GL_CULL_FACE);

///刪 glCullFace(GL_BACK);

glEnable(GL_DEPTH_TEST);

glDepthFunc(GL_LESS);

glEnable(GL_LIGHT0);

glEnable(GL_NORMALIZE);

glEnable(GL_COLOR_MATERIAL);

glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);

glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);

glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

glLightfv(GL_LIGHT0, GL_POSITION, light_position);

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

///我們要把 OBJ檔讀進來 (glm.cpp幫忙)

model = glmReadOBJ("Gundam.obj");///讀檔

glmUnitize(model);///縮成 -1...+1範圍

glutMainLoop();

return EXIT_SUCCESS;

}

Show All

利用老師的程式碼 Show 出所有模型關節並轉動

程式碼如下:

#include <stdio.h>

#include <GL/glut.h>

#include <opencv/highgui.h>

#include <opencv/cv.h>

#include "glm.h"

GLMmodel * model=NULL;

GLMmodel * head;

GLMmodel * body=NULL;

GLMmodel * arm1=NULL, * arm2=NULL;

GLMmodel * hand1=NULL, * hand2=NULL;

GLMmodel * bot=NULL;

GLMmodel * leg1=NULL, * leg2=NULL;

GLMmodel * knee1=NULL, * knee2=NULL;

GLMmodel * foot1=NULL, * foot2=NULL;

int show[10]={1,1,1,1,1,1,1,1,1,1};

float angle=0;

void resize(int width, int height);

void timer(int t);

void display();

int myTexture(char *filename);

void loadGundamAll();

void resize(int width, int height)

{

const float ar = (float) width / (float) height;

glViewport(0, 0, width, height);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(60, ar, 0.001, 100);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity() ;

gluLookAt(0,0,3, 0,0,0, 0,1,0);

}

void timer(int t)

{

glutTimerFunc(30, timer, t+1);

angle++;

glutPostRedisplay();

}

void keyboard(unsigned char key, int x, int y)

{

int now=key-'0';

if( isdigit(key) ) show[now] = !show[now];

glutPostRedisplay();

}

void display()

{

glClearColor(0.5,0.5,0.5, 1);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glTranslatef(0, -1, 0);

glutSolidSphere(0.1, 10,10);

glRotatef(angle, 0,1,0);

///glmDraw(model, GLM_SMOOTH | GLM_TEXTURE);

if(show[1]==1) glmDraw(head, GLM_SMOOTH | GLM_TEXTURE);

if(show[2]==1) glmDraw(body, GLM_SMOOTH | GLM_TEXTURE);

if(show[3]==1) glmDraw(arm1, GLM_SMOOTH | GLM_TEXTURE);

if(show[4]==1) glmDraw(arm2, GLM_SMOOTH | GLM_TEXTURE);

if(show[5]==1) glmDraw(hand1, GLM_SMOOTH | GLM_TEXTURE);

if(show[6]==1) glmDraw(hand2, GLM_SMOOTH | GLM_TEXTURE);

if(show[7]==1) glmDraw(bot, GLM_SMOOTH | GLM_TEXTURE);

if(show[8]==1) glmDraw(leg1, GLM_SMOOTH | GLM_TEXTURE);

if(show[9]==1) glmDraw(leg2, GLM_SMOOTH | GLM_TEXTURE);

glmDraw(knee1, GLM_SMOOTH | GLM_TEXTURE);

glmDraw(knee2, GLM_SMOOTH | GLM_TEXTURE);

glmDraw(foot1, GLM_SMOOTH | GLM_TEXTURE);

glmDraw(foot2, GLM_SMOOTH | GLM_TEXTURE);

glPopMatrix();

glutSwapBuffers();

}

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 loadGundamAll()

{

float dimensions[3];

if(model==NULL){

model = glmReadOBJ("Gundam.obj");

head = glmReadOBJ("head.obj");

body = glmReadOBJ("body.obj");

arm1 = glmReadOBJ("arm1.obj");

arm2 = glmReadOBJ("arm2.obj");

hand1 = glmReadOBJ("hand1.obj");

hand2 = glmReadOBJ("hand2.obj");

bot = glmReadOBJ("bot.obj");

leg1 = glmReadOBJ("leg1.obj");

leg2 = glmReadOBJ("leg2.obj");

knee1 = glmReadOBJ("knee1.obj");

knee2 = glmReadOBJ("knee2.obj");

foot1 = glmReadOBJ("foot1.obj");

foot2 = glmReadOBJ("foot2.obj");

glmDimensions(model, dimensions);

glmScale(model, 2.0/dimensions[1]);

glmScale(head, 2.0/dimensions[1]);

glmScale(body, 2.0/dimensions[1]);

glmScale(arm1, 2.0/dimensions[1]);

glmScale(arm2, 2.0/dimensions[1]);

glmScale(hand1, 2.0/dimensions[1]);

glmScale(hand2, 2.0/dimensions[1]);

glmScale(bot, 2.0/dimensions[1]);

glmScale(leg1, 2.0/dimensions[1]);

glmScale(leg2, 2.0/dimensions[1]);

glmScale(knee1, 2.0/dimensions[1]);

glmScale(knee2, 2.0/dimensions[1]);

glmScale(foot1, 2.0/dimensions[1]);

glmScale(foot2, 2.0/dimensions[1]);

}

myTexture("Diffuse.jpg");

}