1. A method for determining information about an object, the method comprising: illuminating an object with a plurality of lines of light, the lines being spaced-apart along an axis; acquiring a sequence of images of the lines of light while rotating the object about the axis; for each image, determining a location of an extremum for each of the lines of light; establishing a reference line based on the location of the extrema for a first plurality of the lines; calculating a deviation between the extrema of a second plurality of the lines and the reference line; and determining information about the shape of the object based on the calculated deviations.