Cid week04 旋轉 Rotate

Step01

 首先進入老師網站 https://jsyeh.org/3dcg10/ 下載[data][win32]檔案，並使用7-zip解壓縮至windows，並把data解壓縮至windows資料夾內，

執行檔案Transformation

Y軸旋轉

X軸旋轉

Z軸旋轉

了解XYZ軸的選轉方向

XY軸旋轉

Step02

下載moodle的FreeGLUT MinGW壓縮檔案，並解壓縮至桌面，把lib資料夾內的libfreeglut.a檔案複製貼上並重新命名libglut32.a，開啟Code Blocks，開啟新專案，File>Project>選擇GLUT Project>命名專案>選擇桌面的資料夾freeglut

讓茶壺旋轉

程式碼 新增旋轉的程式碼

#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("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

打光+旋轉茶壺

程式碼 新增打光的程式碼

從範例程式碼複製 ctrl+f 搜尋(const GLfloot light)和(glEnable)

#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();

}

Step03

老師教了個口訣：「左耳靠在左肩上，程式碼由下往上讀」

藍色的車子長胖了拉到右邊去選轉他

把藍色的茶壺移到右邊旋轉

程式碼

#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();

    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();

}

新加一個黃色茶壺

程式碼

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();  

        glTranslatef(0.5, 0, 0); ///移到右邊

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

        glColor3f(0,0,1);///藍色的

        glutSolidTeapot( 0.3 );///茶壺

    glPopMatrix();

    glPushMatrix();

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

        glTranslatef(0.5, 0, 0);///移到右邊

        glColor3f(1,1,0);///黃色的

        glTranslatef(0, 0.5, 0);///往上移

        glutSolidTeapot( 0.3 );///茶壺

    glPopMatrix();///還原矩陣

    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();

}