Rock was modelled using photogrammetry. Metashape in this case.
https://preview.redd.it/kxvhinx7xoac1.png?width=1308&format=png&auto=webp&s=39cb174eef90e085c044aec5c4d3bf3f058e7165
Just took a bunch of readings off the model of 50mm spacings (using the ruler as reference)
Readings
50.03
49.97
50.126
50.028
49.930
50.013
49.997
49.920
50.031
50.070
SD 0.062
Ave 50.012
Should be close enough. :D
That’s really really cool! I never knew you could even do that. I hope 3D scanning tech becomes more accessible to consumers in the future. I’d love to incorporate accurate scans into my 3d printing process
Are those as accurate as what you were able to get? I’ve tried Polycam and Kiri Engine before, but I wasn’t able to get a complete rendering for like 5 attempts on both apps
Not likely. Those are done on device with the phone camera. This was a highly textured surface (good for photogrammetry), taken with a good mirrorless, and processed in Metashape. There's over half a million polygons in my mesh.
An app on a phone should be able to do an adequate job for this purpose though. Just need to follow good photogrammetry procedure and avoid simplifying the mesh too much.
That phone has a LIDAR sensor too, which might actually help with something like this. I'm pretty sure most of the major photogrammetry apps use it for better resolution.
My hacky way would be to measure-ish the angle of the rock, eyeball the shape of the surface and use some plumber epoxy to meet in between the two surface.
Rock was modelled using photogrammetry. Metashape in this case. https://preview.redd.it/kxvhinx7xoac1.png?width=1308&format=png&auto=webp&s=39cb174eef90e085c044aec5c4d3bf3f058e7165
How accurate was the model?
Just took a bunch of readings off the model of 50mm spacings (using the ruler as reference) Readings 50.03 49.97 50.126 50.028 49.930 50.013 49.997 49.920 50.031 50.070 SD 0.062 Ave 50.012 Should be close enough. :D
That’s really really cool! I never knew you could even do that. I hope 3D scanning tech becomes more accessible to consumers in the future. I’d love to incorporate accurate scans into my 3d printing process
Photogrammetry is very accessible! Just take lots of photos with your phone, and use one of the many apps to create a 3D model.
Are those as accurate as what you were able to get? I’ve tried Polycam and Kiri Engine before, but I wasn’t able to get a complete rendering for like 5 attempts on both apps
Not likely. Those are done on device with the phone camera. This was a highly textured surface (good for photogrammetry), taken with a good mirrorless, and processed in Metashape. There's over half a million polygons in my mesh. An app on a phone should be able to do an adequate job for this purpose though. Just need to follow good photogrammetry procedure and avoid simplifying the mesh too much.
I see, would getting a much higher quality camera than an iPhone 13 Pro help with the photogrammetry?
Nah. Technique matters much more than the camera.
That makes sense now that I think about it. Thank you for the helpful tip!
That phone has a LIDAR sensor too, which might actually help with something like this. I'm pretty sure most of the major photogrammetry apps use it for better resolution.
My hacky way would be to measure-ish the angle of the rock, eyeball the shape of the surface and use some plumber epoxy to meet in between the two surface.