Reverse engineering is a special process technology in the engineering geodesy. It describes the process of extracting spatial information from real objects (such as maschines, parts of ships, buildings) by e.g. 3D laser scanning in order to reproduce them with graphical software. Reverse engineering offers the possibility to reconstruct equal or new, aligned objects.
We have successfully conducted this method from the very first assignment referring to 3D laser scanning.
3D surveying using TLS
Compared to the data acquisition using a tachymeter, the expenditure of time is usually much lower with respect to terrestrial laser scanning (TLS). Often TLS is even possible during other operations at production sites. Complex and curved geometries, irregular designed rooms or faces of a building can be measured quickly (e.g. 100.000 points per second) and entirely.
3D measurement data (point cloud)
The laser scanner measures huge amounts of 3D points composing a digital point cloud that represents the measured flat, curved or irregular formed object surfaces in a raster-wise manner.
Triangulation (meshing) of a point cloud
Fabrication model of glasses adjusted to the mesh
Glasses adapted to a framework model
Rendered (photo-realistic 3D view) of a mesh inside a vehicle
Mesh of a framework model (shipbuilding)
Triangulation (closed polygons) of a framework model
Developed fabrication models of glasses on a mesh (half-transparent view)
During the evaluation process the punctual measurement data is meshed by polygons using special software. Therefore object surfaces can be replicated with for instance a closed set of triangles. The accuracy of approximation of the surface depends on the amount of points and therefore on the size of the triangles.
These digital replications of are subsequently processed and refined with different software solutions.
At the end of the process a detailed image of the initial object is obtained. This 3D model can be allocated for CAD-applications to architects and constructing engineers.
For further evaluation we are able to extract geometrical shapes, structures, constructional elements or engineering drawings from these digital 3D models. It is also feasible to develop optimally adjusted 3D fabrication models.
-> see 3D modeling
Besides we conduct nominal/actual comparisons between planning models and survey models or survey models and developed fabrication models. The comparison includes for example information about punctual or laminar deviations.
-> see 3D quality control, comparison of products