getFilmWidth() {

		// film not completely covered in portrait format (aspect < 1)
		return this.filmGauge * Math.min( this.aspect, 1 );

	}
Returns the width of the image on the film. If {@link PerspectiveCamera#aspect} is greater than or
equal to one (landscape format), the result equals {@link PerspectiveCamera#filmGauge}.

@return {number} The film width.