week05

先到

http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/?fbclid=IwAR2pHVmbOZQukvzZ2VwY9r-UlW1tjXyUpsCR3CjTIjxgF41L9jJ801oWEVg

下載[data] [win32] glut32.dll 這幾個檔案，接著像上週一樣解壓縮

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開啟Light Material檔案

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成功開啟

可以試著調整光線的角度方向

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練習幫茶壺加上光線效果

程式碼如下

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#include <GL/glut.h>

///打光0:宣告陣列,裡⾯有光的屬性值

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 };///光線的角度

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()///茶壺程式碼

{

 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

 glutSolidTeapot(0.3);

 glutSwapBuffers();

}

int main(int argc, char *argv[])

{

 glutInit(&argc, argv);

 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

 glutCreateWindow("GLUT Shapes");

 glutDisplayFunc(display);

///打光需要的3D depth test

 glEnable(GL_DEPTH_TEST);

 glDepthFunc(GL_LESS);

///打光1:開啟光線

 glEnable(GL_LIGHT0);

 glEnable(GL_NORMALIZE);

 glEnable(GL_COLOR_MATERIAL);

 glEnable(GL_LIGHTING);

///打光2:設定light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);

///打光2.2:要把物體也設定好她的material

 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 EXIT_SUCCESS;

}

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讓光線隨著滑鼠移動

程式碼

#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);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x,int y)

{

        GLfloat light_position[]={2.0f,5.0f,-5.0f,0.0f};///陣列,放位置

        light_position[0] = (x-150)/150.0*10;///用motion的x坐標,算光的位置

        light_position[1] = -(y-150)/150.0*10;

        glLightfv(GL_LIGHT0,GL_POSITION,light_position);///用函式,把光設好

        glutPostRedisplay();///貼個post請GLUT重畫畫面

}

///所增加的程式碼

int main(int argc,char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

///現在我們想要光源動,用motion函式做

    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();

    return EXIT_SUCCESS;

}