The group focused on scanning mirrors and the resulting reflections. A description of their project and progress is given on their blog and here we show the point clouds of the main results.

Behind Pillar

This experiment was done to see how laser rays can be deflected by mirrors to measure things they usually couldn’t. In this case, four mirrors were used to scan behind a pillar. Notice that any mirrors not exactly vertical lead angular displacements in the final viewpoint.

Big Room

This point cloud was scanned in the mirror maze in Luzern. It consists of three individual scans that ReCap was surprisingly able to register automatically, despite the many reflections.

Cyriac

This is an experiment with a reflective foil. It did not work out as well as anticipated, mainly because the foil was not reflecting enough and only totally flat parts of the foil generated usable reflections.

Fake Scanner

This was part of our object generation experiments (see our blog). It was the initial experiment where we got the idea from: four mirrors were placed in equal distance from each other facing outward. For scans were made (one for every mirror), where every scanner was positioned in the same distance to each mirror. The result is this amazing fake scanner in the center, an object which only exists in virtuality.

Heads

Our first practical experiment with the frame. The goal was to generate an object with a face on every side, but this proved to be harder than expected, because our setup is very sensitive to minor object and scanner displacements.

Heads Spirale

Close-up of our -> heads experiment.

HIL Window

Part of our preliminary experiments where we could see the differences between the camera measurements and the laser measurements. The laser was reflected from the windows (presumably by window foil), whereas the camera took pictures from the outside. This scan offers a lot of surprises, most of which we haven’t even discovered yet ourselves.

The Knife

Another part of our object generation experiments, this aimed to create an object where a knife pierces through a theodolit. It failed due to the sensitivity of the frame to small displacements of the objects.

Luzern Curved Mirror

This curved mirror showed us that these objects distort the resulting reflections physically. It was scanned a the Gletschergarten Luzern.

Luzern Curved Mirror 2

This curved mirror showed us that these objects distort the resulting reflections physically. It was scanned a the Gletschergarten Luzern.

Mirror Chair

This experiment was also part of our reflective foil series. Similarly to the scan of Cyriac, even surfaces generate distorted reflections, whereas everywhere else only noise is generated.

Multi Reflection

This mirror consists of several tilted mirrors and shows the multiple resulting reflections physically. It was scanned a the Gletschergarten Luzern.

Palms

A result from a our big room scan at Gletschergarten Luzern. The interesting part about this experiment is that the palms do not exist in reality, but were generated by reflections. Only the sides pointing outwards existed, while there were mirrors between the palms. These do not appear in virtuality and yet the transition seems seamless.

Sultan

Another measurement from the Gletschergarten Luzern, this scan shows the vast hallways and objects of a palace, while the scanned room was only about 4x4 meters (this would be the size of the scan without any mirrors). The yellow tint comes from an error in the camera, because the lighting conditions in the mirror maze were quite bad.

Toilet

Part of our preliminary experiments, this was the first scan we did. It showed us how mirrors have the capability to create entire new spaces in laserscanning.