Week04☝
step01 到老師的網站下載
-windows.zip 👉 下載 \ windows \ Transformation.exe
-data.zip 👉 下載 \ windows \ data \ 模型
step02 解壓縮windows跟zip檔案，將data檔案拉到windows裡面並執行Transformation.exe
step03 執行之後旋轉x軸
step04 找z軸，利用國中教過的右手定則，手指從x軸到y軸，會伸出大拇指z軸，
拇指當旋轉軸，在掃出我們要的角度。
step05 利用各種軸來做應用啦!
-x軸 ( 1 , 0 , 0 ) 轉動時車頭會朝下
-y軸( 0 , 1 , 0 ) 車頭會朝右轉
-z軸 ( 0 , 0 , 1 ) 轉動時車子左側會往上
Week04✌
step01 讓杯子旋轉吧 ! 複製上週的程式碼並修改
step02 執行結果
程式碼:
| #include <GL/glut.h> | |
| float angle = 0; ///宣告global全域變數angle | |
| void display() | |
| { | |
| glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景 | |
| glPushMatrix(); ///備份矩陣 | |
| glRotatef(angle,0,1,0); ///旋轉angle角度 | |
| glutSolidTeapot(0.3); | |
| glPopMatrix(); ///還原矩陣 | |
| glutSwapBuffers(); | |
| angle++; ///把角度++ | |
| } | |
| 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(); | |
| } |
step05 來幫杯子打光啦!!
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; ///宣告global全域變數angle
void display()
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景
glPushMatrix(); ///備份矩陣
glRotatef(angle,0,1,0); ///旋轉angle角度
glutSolidTeapot(0.3);
glPopMatrix(); ///還原矩陣
glutSwapBuffers();
angle++; ///把角度++
}
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();
}
step07 清背景 把杯子改顏色
#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);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
}
float angle = 0; ///宣告global全域變數angle
void display()
{
glClearColor(1,1,1,1);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景
glPushMatrix(); ///備份矩陣
glRotatef(angle,0,1,0); ///旋轉angle角度
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix(); ///還原矩陣
glutSwapBuffers();
angle++; ///把角度++
}
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();
}
Week04👌
以剛剛的Transformation 按右鍵 swap translate rotate 來觀察轉的方向
- 一個是公轉
- 一個是自轉
自轉 :
公轉 :
step02 回到程式碼把他們交換看看 (讀程式由下往上看)
想像一個大圓桌，茶壺放在邊邊，轉動的樣子就像是紅色茶壺一樣繞著中心轉
程式碼 :
#include <GL/glut.h>
float angle = 0; ///宣告global全域變數angle
void display()
{
glEnable(GL_DEPTH_TEST);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景
glPushMatrix(); ///備份矩陣
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(); ///備份矩陣
glRotatef(angle,0,1,0); ///旋轉angle角度
glTranslatef(0.6,0,0);
glColor3f(1,0,0);
glutSolidTeapot(0.3);
glPopMatrix(); ///還原矩陣
glutSwapBuffers();
angle++; ///把角度++
}
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();
}
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