Quickest way to get panorama or photos on to a scan provided with no UVs?

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Peyman Bashiri
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Re: Quickest way to get panorama or photos on to a scan provided with no UVs?

Post by Peyman Bashiri »

jedfrechette wrote: Wed Jul 28, 2021 9:26 pm I would do this in Agisoft using their nodal solver. Basically:
  1. Import the unstitched nodal images and put each pano set in to a "station" group so Agisoft knows they were shot with a nodal head.
  2. Run the alignment, if you're lucky the additional nodal constraints will allow Agisoft to align everything even with much less overlap than you would normally need for photogrammetry. How successful this is, however, will depend on exactly how much overlap and coverage you have. Nonetheless, I've seen it work with pretty sparse data sets.
  3. Manually pick control points between your lidar data and the photos. Then run the alignment again to align the photos to your scans and/or model. You don't necessarily need to have color or intensity associated with the scans as long as you can identify unique features by their geometry. We do our integration in Houdini so that's where we would pick these 3d points, but you can use anything that lets you get coordinates for points on the model.
  4. If you're able to get a good alignment then you can automatically texture your imported model in Agisoft. Even if you're not able to get a great alignment though you still might be able to get it close enough that it will give you a good starting place for manual tweaks if you bring the model, automatic texture and cameras in to Mari.
I wish Agisoft had better tools for automatically aligning photos to independently derived geometry as it could be a very efficient workflow. The needs you've described are a very valid use case for that so I would suggest also posting to their forums describing what you need to do. Their developers are pretty responsive so hopefully if enough of us keep asking for it we'll see improvements in future versions.
Dose Agisoft can handle point cloud? The last time I checked it doesn't.
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Re: Quickest way to get panorama or photos on to a scan provided with no UVs?

Post by jedfrechette »

Peyman Bashiri wrote: Thu Jul 29, 2021 2:09 am Dose Agisoft can handle point cloud? The last time I checked it doesn't.
The newest versions do. Unfortunately, they basically just copied RC's approach of treating scans like panoramas and trying to generate matches via color/intensity feature detection. Although I understand why they did that (it's easy from a development perspective) I think it is fundamentally a poor approach to the problem.
Jed
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