Hi,
it's been a long while since the last update, but I needed new data. This Monday I went to Munic to see Star Wars Identities again. This time I was prepared much better for taking pictures for photogrammetry. In 5 hours I took nearly 1900 photos from the Slave 1, the A- and B-Wing, the Star Destroyer, the AT-AT and a few of the Millennium Falcon. The biggest improvement was that I took a 1m-rule with me, which I put in fromt of the cabinets for a few shots of each model, such that the rule can be solved together with the spaceship models to give an absolute scaling object.
And I am amazed how well it worked for the Slave 1! The model changed place and was now inside the large cabinet with the Star Destroyer and most other models. The lighting there is worse, and some of the brighter bulbes are turned on only for about 1 minute every 12 minutes. To get consistent bright lighting, I took pictures only during those intervals and enjoyed the view during the remaining time.
Again I used VisualSFM and CMPMVS for the analysis. This screenshot from VisualSFM depicts all used camera positions (358 in total):
CMPMVS took 13 hours to get this solve:
This was cleaned up in Meshlab and imported into Rhino.
For all who don't want to know dimensional details, please do not read any further.
With the rule in the solve I can now scale the model to real world dimensions.
I can now confirm the following measurements to an accuracy of about +/- 2mm (estimated upper limit of the uncertainty based on the rule's mesh density):
Length of skirt: 588 mm
Width of skirt: 333 mm
To get a feeling of the accuracy of my first attempt, I imported the last iteration of my reconstructed Rhino model into the file, and it matched up perfectly sizewise, with the only larger inaccuracies worth mentioning being in the region where the first photogrammetry solve was bad because of bad coverage. For most other areas of the mesh the distance between my new solve and the first Rhino model is in the order of 1 mm. So I think both the method and the programs used proved that they lead to an accurate reconstruction.
I'll now first focus on processing the other models before I try to make a new model of the Slave 1 in Rhino.
Best regards,
Thorsten