By default OpenGL use the two sides polygon mode. How to set a SINGLE SIDES POLYGON MODE? I think this mode works faster.

Thanks for help…

If you enabled face culling, that’s just okay.
I think it is as easy as glEnable( GL_CULL_FACE)

Are you thinking of glPolygonMode(GLenum face, GLenum mode);? Parameters for face are GL_FRONT_AND_BACK, GL_FRONT or GL_BACK. Parameters for mode are GL_POINT, GL_LINE OR GL_FILL.

I think that what you want is what Michael says - a combination of setting the polygon winding with glFrontFace();, telling OpenGL which face to cull with glCullFace(); and enabling culling with glEnable(GL_CULL_FACE);