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Messages - Bzuco

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241
General / Re: How to get adaptive resolution of texture?
« on: July 29, 2021, 10:22:19 AM »
1. export mesh from metashape
2. import mesh in blender/3dsmax/...other apps
3. unwrap mesh and scale up polygons(areas where you want more details) in UV editor, but keep every polygon in UV square with no overlaps.
4. import mesh back to metashape
5. make texture with Mapping mode set to keep UV

In example I grabbed top right part of mesh and enlarged it, so in the result that part is much sharper in final texture.

242
General / Re: image stabilisation - yes or no
« on: July 28, 2021, 03:56:39 PM »
I made an attempt. I took six photos of graffiti wall, one row from left to right. First(img 2669-2674) and second(img 2675-2680) attempt was with stabilization off and third(img 2681-2686) with on. I was taking photos from about the same positions and I was pointing to the ~same positions on wall. At third attempt I was slightly far from wall(~30cm), but nothing critical.
My expectations was that 1. and 2. attempt should results in the same pointcloud and 3. attempt should be slightly or significantly different pointcloud.
My expectations were confirmed.
Additional info:
I was taking photos "quickly" holding camera with one hand trying to not move. Manual exposure 1/400, ISO100, F4.0, auto focus on, 5184x3456 jpg, 24mm lens.
Alignment params:  Accur. High, preselect off, key limit 20000, tie limit 0, rest options NO.
Dense cloud: Ultra high, filter aggressive
View matches table also confirmed, that stabilization ON is causing more invalid points...I compared one photo in the middle of the wall with it's two neighbours.

You can comapre 3 rasters from link below to see differences (e.g. in photoshop set difference layer blending mode). Images are ~1pix = 1mm and I was ~2.5m far from wall.
https://www22.zippyshare.com/v/esWhdJBJ/file.html  (23.6MB)

I will be glad if somebody can confirm that this experiment is enough to confirm, that image stabilization brings deviations in point positions. But I also suppose that If I would be holding breath and taking photos after 2 sec. of not moving camera(let stabilization finish its job and return position to center of the chip, etc.) then I would get almost same results as with stabilization off.

243
General / Re: Scanning flowers
« on: July 26, 2021, 11:43:24 PM »
I mostly use metashape for garden projects and point cloud data itself are enough for my purposes(taking heights, distances and camera positions for rendering). Sometimes for greater comfort I am creating also mesh in cloud compare, unwrapped in Rizom UV and textured in meshlab using baking point colors to texture(projecting original photos would be better, but it needs additional procedure and time  :-\ ).

244
General / Re: Scanning flowers
« on: July 26, 2021, 04:35:38 PM »
Hmm, now I understand better what you meant by "melted".
If your dense cloud was lowest quality, then it is impossible to have separated petals in dense cloud and absolutely not in mesh.
You will need dense cloud with points every 1mm...or better every 0.5mm and take another sets of 60 photos 45° from below and 60 photos 45° from above. Only then building mesh algorithm will start to work.
I am assuming, that your dense cloud has density ~ 1point every 2-2.5mm. Lowest settings takes only 1/16 of photo pixels so if your flower was 2048x2048 then lowest means 128x128.

You need to first figure out, why higher quality dense cloud is missing many points. Try to disable depth filtering in build dense cloud dialog...cloud will be probably very noisy.
Check matches(attachment) between photos. More valid matches between photos mean better connections between photos => more precise camera positions, better depth maps, cleaner dense cloud results.
If it did not help, you need to go back to alignment settings. Start with disabling generic preselection...then alignment will start to find matches on every photo with each other, so it will find maximum connected points possible. Be sure to use Highest accuracy, because your mask on every photo take out a lot of space from photo so only flower area matters during process. Then you will start to try change key point limit from lets say 5000 to 100000. Apply mask to should be also set correctly...ensure that matches after alignment process are from flower area and not from background area.

Let me know if it helped you  ;)  :D

245
General / Re: Scanning flowers
« on: July 26, 2021, 12:31:26 PM »
So then 2048x2048 should be enought  :)
Interpolation option in build mesh dialog should have effect only if your resulting mesh vertexes will be denser than points from dens point cloud...or simple said what to do with mesh vertex or its position if there are no close dense cloud points.

In terms of continuity and discontinuity I think metashape has some internal parameter which will make decision when to create separate mesh and when keep it in one continuous piece...dependes of distances between points and also distances betwenn two or more groups of points.

Post closeup screenshot of dense cloud / mesh wire, how it looks like...if it is clean, or if it has some noise in points. If it is OK, then problem is with building mesh algorithm.

I am using metashape only for building dens cloud. For other task(subsampling points, mesh building, noise cleaning,texturing...) I am using cloud compare/meshlab, which has more options set values/parameters. E.g. in cloud compare you have 3 algorithms when building mesh and option to set distance between vertexes in mm, cm, m, ... which is more informative than low/med./high density of mesh in metashape. I am not telling that building mesh in metashape is not good, I just split my workflow on more softwares...each is more suitable for some task.  8)

246
General / Re: Scanning flowers
« on: July 26, 2021, 09:59:10 AM »
Just my small advice...make pure white background behind flower for future projects to eliminate needs of making masks...it will speed up workflow.
If your example photo is cropped 1:1, then try to make bigger photos of the flower or take photos only from yellow flower part, because those yellow leaves have not so much details(it is just yellowish colors with few grooves) and takes only ~540x540pix on photo...that is not enough for more precise mesh/dense cloud.
Also check how many valid/invalid matches do you have between photos and post screenshot of your project info(RMS reprojection error, max repro. error, ...settings...)

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