I captured a couple scans previously with a version I can recall on my pixel 7 pro. In at least two cases the straight wall appears curved in the scan
Any advice?
Hi there,
I apologize for the extended delay, and I appreciate your patience and understanding.
Curvature, artifacts, and other inaccuracies in scans are often due to moving your camera too fast, poor scanning technique, poor lighting conditions, or a combination of factors. I encourage you to take a moment to review our scanning guidelines in our How To guide and try to perform your scans again.
Let me know if you have any additional questions or concerns!
Kind regards,
Maverick L.
Thanks for the feedback. I made a screen capture ( https://youtube.com/shorts/oMmFuVSNoKo?si=-hYiFcyOOmtwk63e ) of a new scan ( https://youtube.com/shorts/oMmFuVSNoKo?si=Ci-B1wErpbAe_TJS ) of the same mural. I was walking a slow normal pace during daylight but had to make minor shifts to get around a utility pole. Do you see anything I’m doing especially poorly?
Thank you for taking the time to share your scanning technique!
It looks like you would benefit from capturing some elements of the background behind the mural, varying the distances and angles you capture from, and moving your device up and down instead of capturing from the same height the entire time.
Let me know what you think of the results!
Kind regards,
Maverick L.
What the user is running into here is a classic image based 3D reconstruction issue. Even with the aid of ARCore on the Pixel 7 Pro, the camera poses in a straight line trajectory is prone to curvature.
I like to relate it to what you experience with a series of connected puzzle edge pieces. While they connect, they can flex and warp away from a straight line. If you step back and walk back to the start of this capture, you get a second line of puzzle pieces with more interconnectivity…and a more rigid result.
Any time you ever capture a scene. Ensure you walk back to where you start but by taking a different trajectory back (camera further back, higher up angled down, etc). Just don’t walk back on the exact same path you can from.
That should make a huge different in the result.
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I’ll chip in and in addition to what was said before, I recommend to also get close to the wall while keeping as much of the subject in frame as possible in order to aid the scanner get a side view of the wall.
(i remember there were some great guides out there but I can’t seem to find it now 
)
Thanks,
I did another pass with two depths and it improved though still not 100% straight
Sam
I tried my learnings from the smaller mural of taking multiple passes at different depths and apply it to a larger mural but I got a curved result