Artec Space Spider
[updated on 26 March 2018]
We were given a dried specimen of this Diodone fish with a question "Can you 3D-scan this one?"
As you see from the screenshots, the answer is yes :) The result 3D model is available for download here. Additionally, feel free to check it here on Sketchfab as well as to review some extra 3D-scanning and processing information below.
- Coloured background with pattern works as an excellent texture feature here!
- The fish is placed on a transparent stand on purpose - it is not visible for the scanner, i.e. it is not recorded and the background can be easily removed during post-processing with an Eraser in a couple of clicks.
- Overall there are 5 scans with about 5700 raw 3D-frames in total.
- Such amount of frames was recorded to capture these long spines over the fish body from all possible angles.
- No spray or something of this kind was used, just Artec Space Spider and Artec Studio 12.
[updated on 08 March 2015]
We scanned this fish with an Artec Eva back in 2015, when our team was asked to develop a fish-scanning technique for one of our clients. An interesting request I should say! :) Feel free to download the result 3D model here.
Trick 1: hang the fish in the air
Trick 2: put the fish on a glass
The reason beyond this recommendation is that you will be able to easily capture the fish from below, i.e. through the glass.
You will need a reference object for a smooth transition from the underside to the upperside. Also, it will be beneficial for alignment, in case you capture several raw scans during this session.
Trick 3: use non-rigid alignment
Overall, this method is excellent for scanning soft objects with simple geometry. Non-rigid alignment algorithm (NRA) is extremely useful, when any object (a person, a fish, etc) moved or changed a shape between scanning session. The less the object changes its shape between your scanning sessions - the better.
- Make several scans and run the Fine, Global and Fusion algorithms on each of them separately
- Select all fusions in Workspace, navigate to Align section and select Non-Rigid Alignment tab
- Mark the fusion, which you want to leave unchanged, as registered, then align all other fusions relative to it
- To speed up the process, you can erase some overlapping geometry, but try not to erase too much
- At the end of NRA, all of your fusions will have a similar shape
- The last step is to run "fusion of fusions", so you will merge your data together. Sharp fusion with a small resolution parameter (0.5 or 0.8 mm) is preferable in this case
Keep in mind, however, that Non-Rigid Alignment is the most time-consuming method and the measurements of the final model may not be 100% faithful to the original.