森 Week04 電腦圖學 選轉

Week04 

1.去https://jsyeh.org/3dcg10/下載[win32],和data檔案，把兩個解壓縮，把data解壓縮檔放進去windows檔案裡，按transformation.exe就可以開啟了。

x,y,z軸的範例圖如下

2.把之前茶壺的稱是加以修改

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle, 0, 1, 0);增加新程式

        glutSolidTeapot( 0.3 );

    glPopMatrix();增加新程式

    glutSwapBuffers();

    angle++;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);增加的新程式

    glutMainLoop();

}

3.複製

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 };

貼在#include <GL/glut.h>底下

和新增一行void myLight()

{

複製程式碼在裡面:

    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);

}

int main(int argc, char *argv[])底下新增myLight();

程式碼成功如下圖

4.口訣:左耳靠左肩

glRotatef:轉動

glTranslatef:位移

glScalef:控制物件長寬高

glBegin:物件