For forward as well as reverse engineering, especially of free form surfaces
the measurement and drawing preparation is an extremely difficult task. To generate the surfaces, sufficient numbers of points on it are necessary. Generation of such points are very difficult through conventional means.
Non-tactile White Light Scanner
(CMERI has been the first organization, in India, to have installed this equipment)
in which dot points generated from reflected light with x, y, z co-ordinates are stored in digitized format. Later on, these dot points are used in surfacer software to generate 3D surfaces. The equipment can collect the data of an area of 8 x 8 square inches in a single exposure. For bigger jobs, quite a few exposures or shots are to be taken to collect the dot points of the whole surface and then all the exposures are to be aligned.
The surfaces generated are then
transformed into Solid Models through Solid Modelling softwares.