오픈지엘 gluLookAt 시점 변환 모델 잘림 해결, 뷰포트

1.

void gluLookAt(GLdouble eyex, GLdouble eyey, GLdouble eyez,
GLdouble atx, GLdouble aty, GLdouble atz,
GLdouble upx, GLdouble upy, GLdouble upz);

2. Arguments

A. 카메라 위치 : (eyex, eyey, eyez)
B. 카메라가 바라보는 점 (초점의 위치) : (atx, aty, atz)
C. 카메라 기울임(Orientation) : (upx, upy, upz)

 

 

void MyDisplay()

{

        glClear(GL_COLOR_BUFFER_BIT);

       

        gluLookAt(1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

        glColor3f(0.0f, 1.0f, 1.0f);

        glutWireTeapot(0.5);

        glutSwapBuffers();

 

        //glFlush();

}

 

카메라 위치를 (1,1,0) 에 뒀는데 잘려버렸다..

뭐가 문제인지 한참을 헤매다가 ..

 

---

 

void MyDisplay()

{

        glClear(GL_COLOR_BUFFER_BIT);

       

        gluLookAt(0.5, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

        glColor3f(0.0f, 1.0f, 1.0f);

        glutWireTeapot(0.5);

        glutSwapBuffers();

 

        //glFlush();

}

위치를 반으로 줄이니깐 잘 나오기 시작했다.

(1,1,0) 은 직선거리가 루트2(=1.414141) 가 나와서 그런 것 같다.

 

 

 

---

void MyDisplay()

{

glClear(GL_COLOR_BUFFER_BIT);



//좌상

glViewport(0, height / 2, width / 2, height / 2);

glLoadIdentity();

gluLookAt(0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0);

glColor3f(0.0f, 0.0f, 1.0f);

glutWireTeapot(0.5);



//우상

glViewport(width / 2, height / 2, width / 2, height / 2);

glLoadIdentity();

gluLookAt(0.5, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

glColor3f(0.0f, 1.0f, 1.0f);

glutWireTeapot(0.5);



//좌하

glViewport(0, 0, width / 2, height / 2);

glLoadIdentity();

gluLookAt(0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

glColor3f(1.0f, 0.0f, 0.0f);

glutWireTeapot(0.5);



//우하

glViewport(width / 2, 0, width / 2, height / 2);

glLoadIdentity();

gluLookAt(1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

glColor3f(0.0f, 1.0f, 0.0f);

glutWireTeapot(0.5);



glutSwapBuffers();



//glFlush();

}