ELF

期中考必考

///OpenGL必背10函式: 拼字、大小寫不能錯

///參數要加，個數不能錯

glPushMatrix();///備份矩陣 10%

    glTranslatef(x,y,z);///移動 10%
    glRotatef(angle,x,y,z);///轉動 10%
    glScalef(x,y,z);///放大縮小 10%

    glBegin(GL_POLYGON);///開始畫
       glColor3f(r,g,b);///顏色 10%
       glTexCoord2f(tx,ty);///貼圖做 10%
       glNormal3f(nx,ny,nz);///法向量 10%
       glVertex2f(x,y);///頂點 10% 也可glVertex3f(x,y,z);
    glutEnd();///結束畫

glPopMatrix();///還原矩陣 10%

Light Material.exe

第二週 http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ 下載檔案


a⇨ ambient
d⇨ diffuse
s⇨ specular

立體茶壺LIGHT

#include <GL/glut.h>

///陣列的宣告，裡面有光的值

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 };
///可以更改數值 改變光源的方向(改變逆光)

///裡面有material的值

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();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Week08");

    glutDisplayFunc(display);

    ///開啟3D

glEnable(GL_DEPTH_TEST);  

///打開第一個燈光

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

///光的設定值

    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);

///material的設定值

    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();

}

立體茶壺LIGHT (滑鼠更改光源設定)

#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刪掉，const表示不能動的變數

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();

}

void motion(int x,int y)

{

    ///可以更改要除的數值

    light_position[0] = (x-150)/15.0; ///光源的X座標

    light_position[1] = -(y-150)/15.0; ///光源的Y座標

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

    glutPostRedisplay();///重製畫面

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Week08");

    glutDisplayFunc(display);

    ///讓mouse motion可以改變光源的位置

    ///裡面要有打光設定的程式

    glutMotionFunc(motion);

    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();

}