OpenGL 正面/背面 背面剔除

• 注意方向

GL_BACK: Culls only the back faces.
GL_FRONT: Culls only the front faces.
GL_FRONT_AND_BACK: Culls both the front and back faces.

• mode  指明前面多边形的方向。可选的值有GL_CW和GL_CCW。默认值是GL_CCW。

glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CW);