Week06

期中考題
glPushMatrix();//push備份矩
   glTranslatef(x,y,z);//移動
   glRotatef(angle,x,y,z);//旋轉
   glScalef(x,y,z);//縮放
   glBegin(GL_PLOYGON);//開始畫
      glNormal3f(nx,ny,nz);//法向量
      glTexCoord2f(tx,ty);//貼圖座標
      glColor3f(r,g,b);//色彩
      glVertex3f(x,y,z);//頂點
   glEnd();
glPopMatrix();//pop還原矩陣



載完window/data/dll檔後
開 Light  Material.exe

左上 Model形狀


左下 Material顏色材質

















右屬性值


會發光的茶壺
程式碼
#include <GL/glut.h>

const GLfloat light_ambient[]  = { 1.0f, 0.0f, 0.0f, 1.0f };///光的顏色
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 0.0f, 0.0f, 0.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };///光的位置

const GLfloat mat_ambient[]    = { 9.0f, 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 };///特別亮的點


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("hellow 3D");
    glutDisplayFunc(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();
}

jsyeh.org/3dcg10參考PDF檔
http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ppt/3dcg10_06illum.pdf
http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ppt/3dcg10_alogl_05light.pdf

光源隨滑鼠動的程式碼
#include <GL/glut.h>
#include <stdio.h>

const GLfloat light_ambient[]  = { 1.0f, 0.0f, 0.0f, 1.0f };///光的顏色
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 0.0f, 0.0f, 0.0f };
 GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };///光的位置要讓他跑所以不要const

const GLfloat mat_ambient[]    = { 9.0f, 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 };///特別亮的點


void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glutSolidTeapot(0.3);
    glutSwapBuffers();

}
void motion(int x,int y)///滑鼠按下後的motion函式
{
    light_position[0]=(x-150)/150.0;
    light_position[1]=-(y-150)/150.0;
    glLightfv(GL_LIGHT0, GL_POSITION,light_position);///重設光的位置
    glutPostRedisplay();///請glut送出Re重新 display顯示
    printf("%f %f\n", light_position[0],light_position[1]);

}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("hellow 3D");
    glutDisplayFunc(display);
    glutMotionFunc(motion);///加入motion函式
    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();

}

能量一樣 面積越大 越暗

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