翰翰的日記5

第五周:

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

裡面的windows、glut32.dll、data載下來之後解壓縮把glut32.dll、data丟到windows裡面去

接著把之前那六個轉來轉去的紅色圖形叫出來

再把程式碼改成這樣

#include <GL/glut.h>

///打光的第0步，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 };

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 };

/* Program entry point */

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitWindowSize(640,480);

    glutInitWindowPosition(10,10);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

///打光也需要 3d的 depth test

    glEnable(GL_DEPTH_TEST);

    ///打光1:要開啟光線，原來範例就寫好了

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

///打光2:要設定光light的設定值 (前面有陣列，這裡拿來用

    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:要把物體也設定好它的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);

///其實原本177行程式裡，已經有打光需要的程式了

    glutMainLoop();

    return EXIT_SUCCESS;

}

接下來把程式改成下面那樣就可以幫茶壺打光了

#include <GL/glut.h>

///打光的第0步，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 };

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 };

/* Program entry point */

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};

    light_position[0] = (x-150)/150.0 * 10 ;

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

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glutPostRedisplay();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

glutMotionFunc(motion);

///打光也需要 3d的 depth test

    glEnable(GL_DEPTH_TEST);

    ///打光1:要開啟光線，原來範例就寫好了

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

///打光2:要設定光light的設定值 (前面有陣列，這裡拿來用

    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:要把物體也設定好它的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);

///其實原本177行程式裡，已經有打光需要的程式了

    glutMainLoop();

    return EXIT_SUCCESS;

}

加入以下這段程式碼可以把視窗拉大

#include <GL/glut.h>

///打光的第0步，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 };

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 };

/* Program entry point */

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};

    light_position[0] = (x-150)/150.0 * 10 ;

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

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glutPostRedisplay();

}

static void resize(int width, int height)

{

    const float ar = (float) width/ (float) height;

    glViewport(0,0, width, height);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(-ar,ar,-1,+1,-1,+1);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    }

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

glutMotionFunc(motion);

///打光也需要 3d的 depth test

    glEnable(GL_DEPTH_TEST);

    ///打光1:要開啟光線，原來範例就寫好了

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

///打光2:要設定光light的設定值 (前面有陣列，這裡拿來用

    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:要把物體也設定好它的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);

///其實原本177行程式裡，已經有打光需要的程式了

    glutMainLoop();

    return EXIT_SUCCESS;

}