setFlipSided( flipSided ) {

		if ( this.currentFlipSided !== flipSided ) {

			const { gl } = this;

			if ( flipSided ) {

				gl.frontFace( gl.CW );

			} else {

				gl.frontFace( gl.CCW );

			}

			this.currentFlipSided = flipSided;

		}

	}
Specifies whether polygons are front- or back-facing
by setting the winding orientation.

This method caches the state so `gl.frontFace()` is only
called when necessary.

@param {boolean} flipSided - Whether triangles flipped their sides or not.