End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
OpenGL 기초 3: 3차원 좌표, 와인딩 & 컬링, 폴리곤 모드, 예제(주전자, 도넛 등) 호출 http://yoonbumtae.com/?p=932