Messages

31

Bug Reports / Re: Honey, I shrunk the kids...

« on: September 27, 2023, 12:27:11 AM »

Good point. I think you could have nailed it. The customer gave me a pre-processed project and he might have created using an older version, now he is working with 2.0.3. followinf my advise. This is what he did after the upgrade. He replaced images (out of camera jpg's) with a new set of jpg's from raw. So in the new project in 2.0.3 he changed pàths for all photos and realigned using the option reset current alignment, but kept marker projections placed on original jpgs.

And then we had the abnormal scale issue.

I have suggested him to start a new project from scratch but he is reluctant to align 30k photos again, mainly because the photos had been carefully organised into camera groups according to several criteria and he spent quite a long time creating this structure....
What would be a smart way to copy the project structure to a new project file?

Regards

32

General / Re: Automatic scaling

« on: September 25, 2023, 02:48:19 AM »

I'm guessing you want to automate something
Do you repeat your captures strictly? if so, you could define your scale by either entering camera known coordinates (estimated with a standard dataset) or by setting a scale bar between cameras. maybe...or maybe not.
If you want accurate answers, you probably need to provide more details of your use case.

33

General / Re: Canon RF 5.2mm F2.8L dual fisheye

« on: September 25, 2023, 02:31:59 AM »

if your dua fisheye lens produces a single image with two halves. I'd be glad to help you with this uncommon approach. Feel free to contact me at jose.rubio@accupixel.co.uk
Regards
José Martínez

34

Bug Reports / Honey, I shrunk the kids...

« on: September 24, 2023, 10:21:19 PM »

Hello. I have experienced one of the weirdest things ever with Metashape 2.0.3
I'm processing a large project with a some thousands of photos, and after finished alignment and some other pretty standard operations, I closed the project until next day.
When I open, I see the sparse cloud has been dramatically downscaled for no reason...

Any thoughts?.

José Martínez

35

Feature Requests / Re: Snapping Tool for Line and Polygon: Enhancing Volumetric Calculations

« on: September 22, 2023, 08:57:02 PM »

Hello, Joel: The snap function actually exists, although I would agree with you it needs to be improved. But at least snap to vertices and to nearest point on another vector exists.
Snap to mesh actually also exists too, and works constantly when you draw on a mesh. If you want denser polylines like sections or profiles, it can be done on 2.5D and then brought to 3d.

When it comes to colours. I'm not sure if I got your request. If you want photographic colours and detail on your triangles so they look as crisp as in the photos, then you need to build a texture. If you dislike the washed colours when you look at your mesh shaded (with colour per-vertex and interpolated), this is due to the low density of your triangulation. But a low density mesh is not necessarily inaccurate, actually it rather is optimal for surveying use.
Do you want shaded colour look like real?, then you can do in two ways: Densify you mesh by sampling dense points on it and then build a new mesh from the new dense cloud... or process from scratch at higher settings with a higher custom triangle count target. I would not go this way but rather would use textures for nice renders and light meshes for good measurement.
If you need help do not hesitate to reach me at Accupixel. We are Agisoft certified trainers.
Best regards.
José Martínez

36

Bug Reports / Re: Points visible only from certain angles

« on: September 16, 2023, 08:09:44 PM »

Hello: I think your problem is the front clipping plane, one mostly unexplanined and uncontrollable "feature" we have in Metashape. All you need to do is to re-center the visualisation volume to see all points close to your point of view.  Use Doble click on one point so it becomes the new center of the world.

Agisoft, please give us a proper set of tools to take control of view clipping. Almost every 3D software provides something to allow user to manage clipping boxes or clipping planes, save them, etc.
use "filter" tool is something, is better than nothing, but is not flexible at all... is not even the right name. "filter" is more for noise removal, or to change visualisation by class.... but not to hide parts.

Regards

José Martínez
ACCUPIXEL

37

Bug Reports / Re: Colourise Laser Scan bug / odd behaviour

« on: September 16, 2023, 07:53:24 PM »

I can confirm the bug. A very important bug, actually.

I have aligned a set of images to 5 tls referenced scans, they all look fine, then I colorise point cloud and the result is a brandnew dense cloud object that surprisingly is well colorised depite its location is rotated and shifted unlike photos that remain well positioned relative to the scans. So it looks like the jump occurs after colourisation.

Most of TLS integration needs a full rework in my opinion.

Regards.

José Martínez
GEOBIT & ACCUPIXEL

38

General / Re: Cameras positions and EO for multi-cameras layouts

« on: August 07, 2023, 11:16:44 PM »

I think you need first to import multicamera images, then define slave to master relative orientation in camera calibration dialogue, and then impor references for rthe master images (likely RGB) as if they were not multicameras. This should force NIR images EO.
I hope this helps,

Regards
José Martínez
Accupixel & Geobit Consulting
Metashape training

39

General / Re: Power cables in the dense cloud

« on: June 20, 2023, 02:01:53 PM »

can you please post a comparison example from the same set of images with both. Power cables are well detected by the built-in function, but the output is a vector drawing, not dense points.

Regards

José Martínez

40

General / Re: Preselect image pairs while aligning chunks

« on: June 16, 2023, 03:36:08 PM »

Hola superpulpo:
in your case I think it would be faster to align all photos at onece selecting sequential strategy for preselection. If you have about twenty redundancy that is to say 95% front overlap, I would say you can apply an important overlap reduction either by blindly sampling photos in advance, or by a more precise method, after alignment, apply overlap reduction based on a rough mesh that you can obtain from the sparse point cloud.
Another approach could be to let some photos to be included in both chunks that you want to link, that will make chunk to chunk alignment "by cameras" almost instantaneous.
We have assisted some users doing the same type of surveys in Florida. If you want to know more, please contact my partner Simon Brown. https://accupixel.co.uk/2022/05/13/scripting-the-value/
Regards

José Martínez
Accupixel & Geobit
Metashape training and consultancy

41

General / Re: Conversion from point cloud to mesh not working

« on: June 14, 2023, 04:14:51 PM »

Sorry, Mark, I missed that you are trying to build a mesh from lidar points and not from photos. Yes, mesh form depth maps or mesh from dense cloud requires aligned set of photo to be available as the source options in the mesh dialog.
If your las is classified you might use ground class to get a DTM if it's not then you can try the ground classification tool and later do the same. Normally you cannot expect to have a nice mesh from forestry lidar data because the points are everywhere into the canopy structure and form a scattered "fog" inside, making it hard for the program to estimate point normals and thus deliver a detailed and accurate mesh. If you are lucky enough and have enough points hitting the ground, you can at least create a good terrain model... but yes, all are pro features.

 
José Martínez
Accupixel & Geobit
Metashape training

42

General / Re: Safety message

« on: June 14, 2023, 01:54:05 PM »

I back you on this, Dieter. You are righter than right. The default behavior should be never overwrite, but only if user specifically wants to.

José Martínez
Accupixel & Geobit
Metashape training

43

General / Re: Conversion from point cloud to mesh not working

« on: June 14, 2023, 01:49:24 PM »

Hi, Mark:
It looks like you are building the mesh from the sparse point cloud (tie points), you should rather use either "from depth maps" or "from dense point cloud" methods.
The latter will take longer, and the results may be slightly different but also in return you will have the opportunity to classify the dense cloud prior to mesh and filter by class the points you want to use for meshing.

Regards,
José Martínez
Accupixel & Geobit
Metashape training

44

General / Re: Multiple Different cameras used in one scan - possible - normal results...?

« on: June 11, 2023, 05:48:55 PM »

Yes you can.

45

General / Re: How to locate the corresponding 3d points of a pixel region of orthomosaic?

« on: May 13, 2023, 01:45:35 PM »

I think this could work only if a DEM exists. Draw a shape around the area of interest on the orthomosaic, right click and choose update altitudes. Then goto mesh and you'll see the shape in 3D, if you are on dense cloud you can also select points enclosed by shape, if that is your desire. If you want a more detailed shape projected onto the mesh all along the edges, and not just on the vertices, there's is a workaround as well.
Regards

José Martínez
info@accupixel.co.uk
Accupixel & Geobit
Metashape training