week04 旋轉Rotation

第一堂課

前往https://jsyeh.org/3dcg10/

下載Win32,Deta

並各自解壓縮

點選Transformation 是玩裡面的旋轉功能(Rotation)  =>會用到安培右手

Y軸

X軸

Z軸

座標變成(1,1,0)

第二堂課

開一個新的GLUT專案  Week04 GLUT_Rotation

複製貼上之前的10行程式碼，然後加入新的

#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("week03");

  glutDisplayFunc(display);

  glutIdleFunc(display);

  glutMainLoop();

}

會出現旋轉茶壺

week04-2

將04-1的程式碼複製貼上,再加入剛剛複製的程式碼

#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 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();

}

會得到有光的旋轉茶壺

第三堂課

前往https://jsyeh.org/3dcg10/

下載Source

如何判斷公轉,自轉  =>口訣:"左耳靠左肩"

Week04-3 rotate_translate

旋轉的藍色茶壺

複製04-1的程式碼並加入glColor3f(0,0,1);

完整的程式碼

#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("week03");

  glutDisplayFunc(display);

  glutIdleFunc(display);

  glutMainLoop();

}

藍色和黃色茶壺一起旋轉

#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 );

 glPushMatrix();

 glRotatef(angle, 0, 1, 0);

 glTranslatef(0.5, 0, 0);

 glColor3f(1,1,0);

 glTranslatef(0, 0.5, 0);

 glutSolidTeapot( 0.3 );

 glPopMatrix();

 glutSwapBuffers();

 angle++;

}

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

{

  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

  glutCreateWindow("week03");

  glutDisplayFunc(display);

  glutIdleFunc(display);

  glutMainLoop();

}