leane-week04

 week04-旋轉rotation

上課主題:旋轉rotation

week04-1

1.先去https://jsyeh.org/3dcg10/下載data和win32

2.兩個都解壓縮把data放到window

3.打開data裡的transform可以看到車車(如下圖)

4.滑鼠點擊可以移動軸的位子

右手定則橫著手心向上x軸往上掃y軸x,z軸在鼻子

*拇指當軸剩下四根手指就是擺動方向

week04-2

把上週的程式拿過來用:茶壺轉

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glRotatef(angle, 0,1,0);///備份的矩陣

       glutSolidTeapot( 0.3 );

        glPopMatrix();///還原矩陣

        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();

 }

開第二個glut專案把第一個複製到第二個

(茶壺變成黃色茶壺背景變白色)

#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);

    lMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

}

float angle = 0;

void display()

{

    glClearColor(1,1,1,1);

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glRotatef(angle, 0,1,0);

     glColor3f(1,1,0);///備份的矩陣

       glutSolidTeapot( 0.3 );

      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);

    myLight();

    glutMainLoop();

 }

week04-3

移動旋轉程式碼如果對調結果會不一樣

在下面按右鍵 swap translate rotate

1.在旁邊自己轉(自轉)

2.繞著中心轉(公轉)

#include <GL/glut.h>//茶壺一個公轉一個自轉

float angle = 0;

void display()

{

    glEnable(GL_DEPTH_TEST);

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef(0.6,0,0);

    glRotatef(angle, 0,1,0);

    glColor3f(1,1,0);

    glutSolidTeapot( 0.3 );

    glPopMatrix();

    glPushMatrix();

    glRotatef(angle, 0,1,0);

    glTranslatef(0.6,0,0);

    glColor3f(1,0,0);

    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();

 }

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