1. A non-contact method for inspecting an object comprising, in any suitable order: i) obtaining at least one first image of the object on which an optical pattern is projected, taken from a first perspective; ii) obtaining at least one second image of the object on which an optical pattern is projected, taken from a second perspective that is different to the first perspective; and iii) identifying at least one common object feature in each of the at least one first and second images as a photogrammetric target feature, on the basis of an irregularity in the optical pattern caused by a feature of the object deforming the optical pattern as imaged in the at least one first and second images.