setFoveation( foveation ) {

		this._foveation = foveation;

		if ( this._glProjLayer !== null ) {

			this._glProjLayer.fixedFoveation = foveation;

		}

		if ( this._glBaseLayer !== null && this._glBaseLayer.fixedFoveation !== undefined ) {

			this._glBaseLayer.fixedFoveation = foveation;

		}

	}
Sets the foveation value.

@param {number} foveation - A number in the range `[0,1]` where `0` means no foveation (full resolution)
and `1` means maximum foveation (the edges render at lower resolution).