Week08 ─ 沒有最狂只有更狂，狂日記

一、講解期中考的程式碼

glPushMatrix();　　　　　//備份矩陣

glTranslatef(x,y,z);　　//移動

glRotatef(角度,x,y,z);　//旋轉

glScalef(x,y,z);       //縮放

glBegin(GL_POLYGON);   //開始畫

glNormal3f(nx,ny,nz);  //打光法向量

glTexCoord2f(tx,ty);   //貼圖座標

glColor3f(r,g,b);      //顏色

glVertex3f(x,y,z);     //頂點

glEnd();               //結束畫   

glPopMatrix();         //還原矩陣

二、利用程式碼，
讓我們的圖形更加生動，

為茶壺打光。



程式碼如下:

#include <GL/glut.h>

static void display(void)
{
    const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
    const double a = t*90.0;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3d(1,0,0);

    glPushMatrix( );
      //  glTranslated(-2.4,1.2,-6);
      //  glRotated(60,1,0,0);
      //  glRotated(a,0,0,1);
        glutSolidTeapot(0.3);
    glPopMatrix( );


    glutSwapBuffers( );
}

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 };

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);
    //glutKeyboardFunc(key);
    //glutIdleFunc(idle);

    glClearColor(1,1,1,1);
    glEnable(GL_CULL_FACE);
    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);

    glutMainLoop( );

    return EXIT_SUCCESS;
}

三、利用程式碼將圖形切成不同的形狀。



程式碼如下:

#include <GL/glut.h>

float angle=0;

static void display(void)

{

    angle++;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3d(1,0,0);

    glPushMatrix();

    ///glTranslatef(x,y,z);

    glRotatef(angle,0,1,0);

   // glutSolidTeapot(0.3);

 // glutSolidCone(0.8,1,30,30);

 //glutSolidDodecahedron();

 glScalef(0.5,0.5,0.5);

    glutSolidDodecahedron();

    glPopMatrix();

    glutSwapBuffers();

}

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);

//   glutKeyboardFunc(key);

   glutIdleFunc(display);

    glClearColor(1,1,1,1);

    glEnable(GL_CULL_FACE);

    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);

    glutMainLoop();

    return EXIT_SUCCESS;

}