setFramebufferScaleFactor( factor ) {

		this._framebufferScaleFactor = factor;

		if ( this.isPresenting === true ) {

			console.warn( 'THREE.XRManager: Cannot change framebuffer scale while presenting.' );

		}

	}
Sets the framebuffer scale factor.

This method can not be used during a XR session.

@param {number} factor - The framebuffer scale factor.