1. A non-contact measurement apparatus, comprising: a probe configured to be mounted on a coordinate positioning apparatus, comprising an imaging device for capturing an image of an object to be measured; a processor configured to: a) analyse at least one first image of an object obtained by the imaging device from a first perspective and at least one second image of the object obtained by the imaging device, which is the same imaging device used to obtain the at least one first image of the object, from a second perspective so as to identify in each of the at least one first image and the at least one second image of the object at least one common photogrammetric target feature on the object to be measured, determine the two-dimensional coordinates of the at least one common photogrammetric target feature on the object within each image, and then, based on knowledge of the relative location and orientation of the imaging device that took the images, determine the three dimensional coordinates of the at least one common photogrammetric target feature; and b) obtain topographical data regarding a form of a surface of the object via analysis of the distortion of a structured light pattern projected on the object caused by height variation on the surface of the object as imaged in at least one image, obtained by the imaging device, which is the same imaging device used to obtain the at least one first image and the at least one second image of the object, wherein the non-contact measurement apparatus being further configured to use both the data obtained from a) and b) to provide a 3D point cloud that describes the shape of the object.