09163051 上課筆記 week08

 1-1.下載 windows.zip, data.zip,  freeglut.zip

    跟上周一樣的步驟

    開啟 Light Material.exe,

    坐上改變模型,左下改變材質.

 1-2.開新glut專案

    把下列程式碼複製進專案裡

#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 };
const GLfloat high_shininess[] = { 100.0f };
void display(){
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glColor3f(1,1,0);
        glutSolidTeapot(0.3);
    glutSwapBuffers();
}
int main(int argc, char *argv[]){
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(300,300);
    glutInitWindowPosition(300,300);
    glutCreateWindow("week08的視窗");
    glutDisplayFunc(display);
    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 0; 
}

    display()前面是打光的陣列, main函式裡面glEnable到glMaterialfy是打光的函式.

https://jsyeh.org/gl/ 下下禮拜考試的練習.下面11行是基本的函式.

glPushMatrix();//備份矩陣
    glTranslatef(x,y,z);//移動
    glRotatef(angle,x,y,z);//轉動
    glScalef(x,y,z);//縮放
    glBegin(GL_POLYGON);//開始畫
        glColor3f(r,g,b);//色彩
        glTexCoord2f(tx,ty);//貼圖座標
        glNormal3f(nx,ny,nz);//打光的法向量
        glVertex2f(x,y);//頂點
    glEnd();//結束畫
glPopMatrix();//還原矩陣