準備好期中退選了嗎?

期中考準備

打光Light

http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ 

windows

data

glut32

下載

Light Material

今天主題

開啟 glutproject  

#include <GL/glut.h>

光的陣列宣告

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 };

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 };

茶壺程式

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("week07 light");

打光設定函式

 glutDisplayFunc(display);

3D深淺度測試>>>>>近的蓋掉遠的

 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);

 glutDisplayFunc(display);

    

}

進階

滑鼠按著光源跟著移動

#include <GL/glut.h>

光的陣列宣告

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 刪掉讓數值可以變動

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 };

茶壺程式

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot( 0.3);

    glutSwapBuffers();

}

motion函式改light_position[]的值，呼叫函式

void motion(int x,int y)

{

光源x的座標

    light_position[0]=(x-150)/15.0;

光源ㄗ的座標

    light_position[1]=-(y-150)/15.0;

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

重畫畫面

    glutPostRedisplay();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week07 light");

   打光設定函式

    glutDisplayFunc(display);

   讓mouse motion 可以改變光源位置

    glutMotionFunc(motion);

    3D深淺度測試>>>>>近的蓋掉遠的

    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);

    glutDisplayFunc(display);

    glutMainLoop();

}