2 minute read
Scanning
Scanning
We tried both photogrammetry and also 3D Scanning. for Photogrammetry a Canon Camera 700D and for the 3D scanning a Creaform Handyscanner was used.
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For photogrammetry we maid our on reference plate in order to become able to match the scales of the stones after scanning with the reality. Also for the 3D scanning, the scanning stage was made by the B-Made staff. Using that, there were no need to have extra referencing nodes on the stones to identify to geometry, since there were enough referencing points on the scanning stage.
Overall, 3D Scanning was more reliable, easier to use, faster and more precise in comparison to the photogrammetry. The analysed comparison will be discussed later.
As my thesis topic, my main task in the group througout the year was to analyze the general workflow and try to find new ways to enhance the general process from the System’s Engineering point of view.
For 3D scanning, we use “VX-Elements” to scan the stone. Then we use “Z-Brush” to cap the holes and reduce the mesh size. Then the “Geomagic” to simplify the mesh. At the end, the *.obj file is ready to be imported into the Grasshopper.
On the other hand, when we choose the photogrammetry, the “Autodesk Recap” is the useful software to put the photos together and make the mesh. Then the rest of the process is through the “Z-brush” and “Geomagic” as well.
Alternatives Availability of Resources
Photogrammetry Cost Time Labour Precision
3D Scanning
Both are available equally The camera is cheaper than the 3D scanner, but until the group has access to it, they are equal. 10 mins + 20 mins postproduction 1 person
3 D Scanning is more precise and convinient
Photogrammetry Setup
The trade-off here is the fact that VX-Element is a live software, so we can see the mesh actually while the stone is being scanned. Different sides of the stone would be visible, and the amount of the errors will reduce. However, when using the photogrammetry, this is not the case anymore. The SD card will be taken out of the camera and photos will be sent to the Autodesk Recap, and it takes a while to produce the mesh, and then we can see the mesh for the first time, and if there is something wrong with our scan, we should do the entire process again.
