OpenGL Transformation
http://dis.dankook.ac.kr/lectures/cg08/entry/transformation-예제
OpenGL Geometry: Cube, glutShapes, gluQuadrics
http://dis.dankook.ac.kr/lectures/cg07/entry/geometry-cube-glutShapes-gluQuadrics
OpenGL Cube Transformation
http://dis.dankook.ac.kr/lectures/cg08/entry/cube3d-예제