week04

到https://jsyeh.org/3dcg10/ 下載win 及data壓縮檔

打開transformation出現可以轉動的汽車

使用右手定則表示XYZ軸

0

測試XYZ軸的旋轉

glRotatef()

做出會旋轉的茶壺

#include <GL/glut.h>

float angle=0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix();///備分矩陣

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

        glutSolidTeapot( 0.3 );

    glPopMatrix(); ///還原矩陣

    glutSwapBuffers();

    angle++;///角度++

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);///有空idle時,就重畫畫面

    glutMainLoop();

}

將茶壺打光

#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()

{

    glClearColor(1,1,1,1);

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix();///備分矩陣

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

        glColor3f(1,1,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix(); ///還原矩陣

    glutSwapBuffers();

    angle++;///角度++

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);///有空idle時,就重畫畫面

    myLight();

    glutMainLoop();

}

上色

void display()

{

    glClearColor(1,1,1,1);

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix();///備分矩陣

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

        glColor3f(1,1,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix(); ///還原矩陣

    glutSwapBuffers();

    angle++;///角度++

}

將移動,旋轉程式碼對調，結果會不一樣

做出兩個不同轉法的茶壺

#include <GL/glut.h>

float angle=0;

void display()

{

    glEnable(GL_DEPTH_TEST);

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix();///備分矩陣

        glTranslatef(0.6,0,0);

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

        glColor3f(1,1,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix(); ///還原矩陣

    glPushMatrix();

    glRotatef( angle,0, 1, 0 );

    glTranslatef(0.6,0,0);

    glColor3f(1,0,0);

    glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

    angle++;///角度++

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);///有空idle時,就重畫畫面

    glutMainLoop();

}