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Messages - JMR

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31
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

32
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

33
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

34
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

35
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

36
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

37
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

38
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

39
Yes you can.

40
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

41
General / Re: failure to assign marker points
« on: May 07, 2023, 12:57:16 PM »
I have the impression that your images do not have enough overlap, it seems overlap is under 50% and that leaves areas with zero overlap and that will make impossible to reconstruct. Is an image is reluctant to align but you are positively sure that it overlaps with aligned images, then you need to place at least 5 markers in that particular image connecting it to aligned ones.
José Martínez
Geobit & Accupixel
Metashape training

42
General / Re: no tie points on road surfaces
« on: April 29, 2023, 12:13:21 PM »
The asphalt shows almost no features. I would suggest to use RAW->tif  to prevent compression artifacts and perhaps you manage to recover more details. To be honest I would be surprised if you had a clean flat surface out of this picture.

43
General / Re: Wrong camera calibration - adjusted focal lenght too off
« on: March 23, 2023, 01:48:58 AM »
Hello, michaldolnik
I suggest you to carefully inspect geotags.
I have seen some cases where really bad geotags are wrongly qualified as accurate as a few centimetres while just watching the coordinates one can see they are wrong.
When you load pictures in a new project you will see the blue balls representing camera locations. watch and see if there is any obvious blunder or misplaced ball.
if you see something suspicious, just uncheck the box for the suspicious photos. If they are tagged as accurate, they can potentially causing a strong bias in both exterior orientation and interior params.

Best regards
José

44
General / Re: GUI in Spanish
« on: February 01, 2023, 02:16:02 AM »
Thank you! That SP GUI typo is likely my fault, I'm sorry! :-[
by the way, don't you think Omega Phi Kappa is the "right", the same fashion as XYZ is the right way for me whereas YXZ... is like driving on the left lane. Very much of an annoyance like nowadays is the entire English System of measurement. (personally: I think the whole world would benefit from banning non IS units whose survival in the globalized world only produces headaches and often catastrophic errors... even some English people privately agree)
Regards

José Martínez Rufio... ups, sorry, it's Rubio

45
Feature Requests / Allow saving bounding region
« on: January 23, 2023, 03:01:53 PM »
I know we can use script to copy region from one chunk to another, but it would be useful to save it so it can be recalled easier.
Regards

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