week06

(1)其中考考題

glPushMatrix()://push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);//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

(2)複習內容

(3)打光:教材(理論/實作 操作)
              實作

todo1

教材light material.exe
左上:調model
左下:material
右:屬性


可以換model

todo2

新glut專案
打光

#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};
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};//打光源
const GLfloat high_shininess[]={100.0f};//光

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("hello 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();
}

todo3

調亮度

todo

用motion改光位置

#include <GL/glut.h>

const GLfloat light_ambient[]={2.0f,0.1f,0.0f,1.0f};

const GLfloat light_diffuse[]={3.0f,1.0f,2.0f,5.0f};

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,0.5f,0.8f,1.0f};

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

const GLfloat high_shininess[]={90.0f};

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

#include <stdio.h>

void motion(int x,int y)///滑鼠按下後的motion

{

    light_position[0]=(x-150)/150.0;

    light_position[1]=-(y-150)/150.0;

    glLightfv(GL_LIGHT0,GL_POSITION,light_position);///重設光位置

    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("hello 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();

}