week04 蔣

     WEEK04

week04-0

按照上禮拜的步驟,開啟這張圖

觀察他的轉法,使用右手來理解,拇指是轉動軸,其餘四指是轉動方向

先了解旋轉軸為y軸時怎麼轉,再了解旋轉軸為x軸時怎麼轉,最後了解Z軸怎麼轉

在右手座標系統裡,z軸是「用右手4指,本來向著x軸,掃向y軸後, 決定z軸的方向」

week04-1 rotate

用codeblocks開啟茶壺,原先程式碼備分放記事本

配合原先程式碼改成如下 (茶壺會旋轉)

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers( );

    angle++;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop( );

}

week04-2 rotate_light

先複製貼上week04-1的程式碼

去記事本上原先177程式碼按ctrl+f找light找到2大段,貼上來,其他沒變

#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 myLight()

{

    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);

}

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers( );

    angle++;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week04");

    myLight();

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop( );

}

week04-3 rotate translate

複製week04-1的程式,貼上到week04-3

打幾行程式碼上去

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(0.5,0,0); ///移動到右邊

        glRotatef(angle,0,1,0); ///旋轉的

        glColor3f(0,0,1); ///藍色的

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers( );

    angle++;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop( );

}

複製程式碼

glPushMatrix();

        glTranslatef(0.5,0,0);

        glRotatef(angle,0,1,0);

        glColor3f(0,0,1);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(0.5,0,0);

        glRotatef(angle,0,1,0);

        glColor3f(0,0,1);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glTranslatef(0.5,0,0);

        glColor3f(1,1,0); ///黃色

        glTranslatef(0,0.5,0); ///往上移

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers( );

    angle++;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop( );

}