1. A method of geometrical analysis of an object comprising: supporting the object on a support surface bordered on two adjacent sides with two upward-directed surfaces, inclined with respect to a vertical direction, wherein the object is positioned on the support surface in front of retroreflective surfaces parallel to the support surface and to the upward-directed surfaces, such that the object is silhouetted, wherein the retroreflective surfaces are positioned under and behind the support surface and its adjacent sides; taking at least one photograph of the silhouetted object to obtain an image with an outline of the object; and obtaining geometrical parameters of the object based on the outline of the object and a surface enveloping the object.