Definition: Phototopography, also known as optical topography or photogrammetry, is a method of measuring and analyzing the shape and distribution of an object's surface using light. It involves using a camera to take photographs of the object in question, with the objective being to identify the direction and location of light sources on the object's surface. Phototopography can be used for a variety of purposes, such as identifying potential structural or mechanical defects in objects, measuring the surface area of an object