Week11

Week11

今天一開始上課先去http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/下載四個東西，分別是網站裡面的 [source][data][win32]和 glut32.dll，然後跟以前一樣解壓縮後開啟檔案

然後開啟window裡面的隨機一個檔案，打開他的Notepad++搜尋他的頂點與法向量，然後自己去摸索一下他的程式碼

解壓縮source資料夾，之後用Dev-C++打開它裡面的glm.c,glm.h,transformation.c三個檔案

去下載freeglut，用CodeBlocks新增一個專案新增的GLUT專案裡，把transformation範例拿進來跑，再把glm.c，glm.h放到同一個目錄，再把glm.cpp加入專案裡，執行前要把3D model的data目錄放到freeglut資料夾的bin裡即可執行

之後把上面別人的程式碼全部刪掉，自己親手打造一個程式碼，設計出一個白色的機器人

#include <GL/glut.h>

#include "glm.h"

GLMmodel * model=NULL;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if(model==NULL) model = glmReadOBJ("data/Al.obj");

    glmUnitize(model);

    glmFacetNormals(model);

    glmVertexNormals(model, 90);

    glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week11親手打造的");

    glutDisplayFunc(display);

    glutMainLoop();

}

//////

Light

• 利用"codeblocks"的"GLUT"來複製"light"的程式碼
• "ctrl+f"來搜尋關鍵字"light"
  #include <GL/glut.h>
  
  
  
  
  
  
  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 };

  GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };
                                 ///const 是不可改變的意思,刪掉就可以改了 
  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 };
  
  
  void display()
  {
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
      glutSolidTeapot(0.3);
      glutSwapBuffers();
  }

  
  

   ///新增這個函式 

  void motion(int x,int y) 
  {
      light_position[0]=(x-150)/15.0;  ///光的x座標 
      light_position[0]=(y-150)/15.0;  ///光的y座標 
      glLightfv(GL_LIGHT0, GL_POSITION, light_position);  ///設定位置 
      glutPostRedisplay();  ///重畫畫面 
  
  }
  
  
  int main(int argc,char**argv)
  {
      glutInit(&argc,argv);
      glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
      glutCreateWindow("Week8_light");
  
  
      glutDisplayFunc(display);
      glutMotionFunc(motion);  ///新增這行 , 讓mouse motion改變光源位置 
  
  
      glEnable(GL_DEPTH_TEST);
  
  
      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);
  
  
      glutMainLoop();
  }

進階版-打光

#include <GL/glut.h>

#include "glm.h"

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 };

 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 };

GLMmodel * model=NULL;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if(model==NULL) model = glmReadOBJ("data/Al.obj");

    glmUnitize(model);

    glmFacetNormals(model);

    glmVertexNormals(model, 90);

    glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    glutSwapBuffers();

}

void motion(int x,int y)

{

    light_position[0]=(x-150)/15.0;  ///光的x座標

    light_position[0]=(y-150)/15.0;  ///光的y座標

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);  ///設定位置

    glutPostRedisplay();  ///重畫畫面

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week11親手打造的");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glEnable(GL_DEPTH_TEST);  ///3D的深淺度

    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);

    glutDisplayFunc(display);

    glutMainLoop();

}

轉180度後-

#include <GL/glut.h>
#include "glm.h"
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 };
 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 };
GLMmodel * model=NULL;
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    if(model==NULL)
    {
        model = glmReadOBJ("data/Al.obj");
        glmUnitize(model);
        glmFacetNormals(model);
        glmVertexNormals(model, 90);
    }
    glPushMatrix();
        glRotatef(180,0,1,0);
        glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);
    glPopMatrix();

    glutSwapBuffers();
}
void motion(int x,int y)
{
    light_position[0]=(x-150)/15.0;  ///光的x座標
    light_position[0]=(y-150)/15.0;  ///光的y座標
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);  ///設定位置
    glutPostRedisplay();  ///重畫畫面
}
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week11親手打造的");


    glutDisplayFunc(display);
    glutMotionFunc(motion);

    glEnable(GL_DEPTH_TEST);  ///3D的深淺度
    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);

    glutDisplayFunc(display);
    glutMainLoop();
}