This brings the data back into a 3D density field which can be projected onto a 2D plane. The last step simulates the effect of looking at the metal mask through the electron microscope. The resulting 'virtual micrograph' can be compared with real experimental results. Extending the simulation to rotary-shadowing is a matter of computation time. The effects of random noise are not relevant as interesting features on the sample are presumably much larger than any noise levels.
Some results are available below but they are of qualitative rather than quantitative nature.
There is only one metal layer here and it is about 30-50 angstroms thick. In real life resolution is better and images more compicated. This image although very crude, serves as a simple illustration of what's happening.