How to perform a point based alignment in Agisoft Metashape for turntable photogrammetry
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- Опубликовано: 21 авг 2024
- In this tutorial, I walk through the steps of how to perform a point based alignment of two separate chunks in Agisoft Metashape. After aligning two chucks the user can then merge the two chucks to get a single complete model of the object photocaptured. As part of the tutorial, I also show how to use the model to actually mask the photos, masking away the turntable and anything that may be in the background of the photos.
A link to the marker palettes shown in the video is provided below:
alexelvisbadil...
This tutorial is golden. Eventhough I did several objects with great success, shot in chunks, and now I feel really confident, I would just watch it for pleasure as I am doing right now, thanks again Alex!
Thank you, Alex, for another incredible tutorial. It was truly helpful because I spent the last two days trying to process an object capture with macro photos in two chunks and several loops, needing to use the mask. I wasn't succeeding with Reality Capture (a software I really like but in this case Metashape rocked for me). This tutorial saved me from having nothing processed to present at work! Now I have much more confidence in my workflow thanks to your excellent teaching skills. Gracias!
I just watched this again and not sure how I missed that Gradual Selection trick, but man is that helpful!
I thought I would share a trick I discovered that you could do to fix misalignment after the merge if you're having trouble getting them scaled properly...I had this issue with the bottom of a shoe where it was noticeable bigger than the other. I actually ran the Optimize Camera's and then afterwards I re-aligned the photos for the merged chunk....not sure why that worked but it did, and it fixed the issue. I'm sure that simply making sure that both sets are taken from the same distance away for all the images ahead of time would probably prevent issues like this too begin with. I'm just theorizing. I bought a cheap laser measuring tool to help with that for next time.
This is a great tutorial, even though I'm working with UAV (drone) photogrammetry rather than 3D models, this is still probably the best explanation for aligning chunks that I've come across so far. Basically, I'm trying to align thermal images where the Ground Control targets are very difficult to see with an RGB ortho where the Ground Control is easy to see.
hi, thanks for this great video. I am following exactly same steps but my chunks are not at all aligning. What could be the issue. individual models in each chunk are visible, masks are also created but chunks are not aligning. Can you throw some light on this matter ? Would be really helpful.
Nice video! Simple questions: 1. Both turntable prints can be the same or you need to swap for bottom / top photos? 2. What camera are you using? I have two canons with several lenses, but Im worried with blur for fov. (I know, need better lighting to close lens). 3. Can I crop png for turntable and print in normal A4 printer?
one like is not enough for you :) thanks bro
This video has been truly informative for me, great content! However, I'm encountering the "not enough points to align" error during the align chunks stage. Does anyone have information about this? I'm looking forward to your assistance, thanks!
Thank you. 👍
With what accuracy do you need to position the object from different angles (for example, from below and above)? I repeated your tutorial on my model: I ended up with the bottom model being photographed head left and the top head right, and the blocks didn't line up (the head merged with the tail).
Thanks a lot!!!
It shouldn't matter which way the object is facing as long as you have flipped the object. What matters is ensuring that there is enough overlap in the photos between the two chunks. If the point based method doesn't work, I would try a marker based alignment. I have a video for that too :)
Thanks for this helpful video! I tried to print out the markers but they seem way over sized. If I were to print at 100% they are way too big. even 50% is too large based on the measurements you give.
Did you try to print the marker palettes that I provide on my website? If so, you should have success on a large format printer, printing at 100%. If you are talking about the marker from the Agisoft Metashape software, you will likely need to resize in a third party software. I do this in Adobe Illustrator.
Watching this in nov 2023. I however, can't find the 'detect markers' option. Its not there, nor in the tools menu, Don't know how to fix it, can't find help on forums.
Make sure that you are using the professional version of Agisoft Metaphase. The standard version doesn't have some of these tools.
@@alexelvisbadillo thank you, simple solution. Didn't think about this.
I tried follow this tutorial but aligning didnt work. Bouth peaces overlaps each other. What else can be done in this situation?
The issue might be with the photocapture. You can try a marker based alignment, but if that doesn't work you may need to adjust your turntable setup. You should try and photocapture as much of the object as possible from all angles. Make sure that after you flip the object, you capture a good amount of overlap that will align the two chunks.
this is beautiful think you so much. have question about crystal objects i never was able to perform it. are there a solution ?
I have not had the chance to do any myself, but I know there are people who have had success with it. I would search cross polarization and photogrammetry. There are a few video tutorials.
@@alexelvisbadillo 🙏 really a big think you doctor that will help me a lot.
Great video thanks, I'll try that pattern method.
I did somehow get two chunks aligned though and the strange thing is when I merge the dense clouds only one of them is there....I'm not sure why.
I've seen this happen on several occasions where they are aligned but when I merge them one is left out.
This happens to me sometimes, but when I check to see if the merged chunk is activated, one of the other chunks is activated instead. Then, I just double click the merged chunk in the contents pane.
@@alexelvisbadillo Ah so it could possibly just be an annoying bug perhaps? I'll try looking for that next time but I'm pretty sure it was active, I double clicked it.
@@alexelvisbadillo I did manage to get it, and it turned out pretty good but honestly at this point I feel like I'm just getting lucky. I'm sure it will come to me in time.
How are the equations when using turntable and fixed camera? Is there a resource that explains the equations for the fixed camera and the rotating object?
I'm not sure. You may want to try consulting the Agisoft Metashape Manual, or ask this question on the Agisoft discussion boards.
I really appreciate this video!! Most of the time I mask the photos first then run through the workflow. I have some object that metashape just don't like that process. This helped me out a ton. Thank you!!
So the dense cloud is not relevant ? in this workflow is never needed to run the dense point cloud to keeping more resolution mesh ? thankss 🙌🙌🙌
It depends on the object. Nowadays, you don't need the dense cloud. But every once and a while I find a challenging object that I like to run a dense cloud on and then edit that before I run a mesh.
@@alexelvisbadillo thanks Alex. 👍
Hello! Does this work on the standard version of Metashape, or only on the professional one?
Thank you!
I think you should still be able to align chunks, but you will not be able to add scale.
@@alexelvisbadillo thank you! It worked just fine. I had a couple of small holes in the mesh, do you know if there is any function in Metashape to correct that?
@@cristobalascencio329 Yes. I believe it's under the tools tab, mesh, close holes.
@@alexelvisbadillo thank you!
I usually do the masking inside RealityCapture Normal mode (resolution reduced 3times) -which is much faster
and then I import all photos with mask into Agisoft and do the final part similarly as you do
also this looks like super outdated Agi version, isnt it?
Thanks for sharing! It's the most up to date version, I just set it to "classic theme" mode.
@@alexelvisbadillo I also prefer classic theme more
Hello, professor. Do you use the same base - with the same markers - for the initial bottom and top photos? You have two bases with diferentes markers that we can print. Should we use the same for the alignment of the two chunks Thank you.
I usually use a different base for when I capture the top and the bottom of the object just so that the numbers on the markers are not the same.
@@alexelvisbadillo Thank you.
excellent video! but my chucnks don't align correctly :C, I put my object on a surface with marks, and when it aligns them, it overlaps each other, it doesn't put them like in your case. help
Whether or not this will work is dependent on the photoset and at times the object being modeled. Sometimes adjusting the parameters in the alignment dialog can help, but often you might need to resort to using a marker-based alignment instead. I have a video for that as well.