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Solve camera from geometry track

Hello!

I'm trying to track an interior shot, which I also took some lidar scans of. When I track the conventional way, it get's kinda rough and I find that it takes way to long. But when I use a geometry track, import the scan. click off the "moving object" button so the camera moves instead, I get a really good track. Everything seems to stick. But I can't get a solve from that. If I go to a camera solver, It seems to only use the trackers and disregards my track from the geometry track.

Even if I use the "upstream hint". I would like to have the solve to get an accurate st map for use later. Is it possible to use the camera you got from a geometry track to use in a solve?

4 comments

Comments (4)

Adam Hawkes

6 gg fa

Hey Jonas, any reason why you are using a 'Camera Solver'? You can just bolt a 'Scene Export' node directly after 'Geometry Track' and export the camera using a compatible file format such as FBX.

With this method, you will have ideally resolved your optical distortion in the Clip Input node/distortion tab first or a camera preset, in which case you may be better off using the 'Survey Solver', especially if you have access to a Lidar scan.

If you get stuck, send us a message via in-app support, and we can help you from there

; )

Edited

Jonas Eriksson

6 gg fa

Replying to

No it was just to get the distortion, I was thinking that I might as well just use the geometry track made camera since that sticks good with the geometry in the scene. But I can try to measure the distortion in the clip input and see if I can get a good optical distortion from that:)

I might have written that wrong, It's not Lidar, just a mesh of the interior room. But I tried attaching a 'Survey Solver' after the geometry track since that was good. Then I used some trackers and highlighted around 12 of them.

And in the 'geometry' tab in the 'Survey Solver' I clicked 'Generate survey' with those trackers marked. Maybe that's super wrong? - Is that the same as attaching it to the geometry?

After I solved the camera using this method. The camera get's kinda wonky so I'm thinking that I'm doing something wrong here.😅

Adam Hawkes

5 gg fa

Replying to

Ah, I see. If you still have access to the camera and lens, capturing a quick calibration pattern would help accurately measure the distortion. Alternatively, if there are a lot of straight lines in the room, you might be able to use the "measured" option in the distortion tab of the clip input. However, keep in mind that the first method tends to be more precise.

Regarding the survey solver and geometry, we have a YouTube video that touches on useful tips. Although it focuses on a mesh created through photogrammetry, the core principles remain applicable.

: )

Jonas Eriksson

5 gg fa

Replying to

I do but I got a good enough distortion with measuring :) I tried with the Survey but I got the best result just with the geometry track. But I will have that 'Survey Solver' in mind :)

Solve camera from geometry track

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