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Messages - Arie

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General / Re: LIDAR Point Cloud Mesh
« on: September 18, 2020, 07:07:41 PM »
Hey Darko,
attached are some screenshots o the results from some quick processing in cloudcompare. I just calculated the normals with a priority on the z-axis and used the poisson surface reconstruction (afaik Agisoft uses the same algorithm for meshing point clouds).
The mesh would still need to be edited, i.e. removing the lower parts and maybe smoothing the topography out a little. After that you could manually remove the castle from the LIDAR mesh, remove the vegetation from the photogrammetric mesh and merge the two. That would give you a starting point for creating a halfway decent 3D-print.
I would also strongly advise to use the new depth-map based reconstruction for the castle. The resulting mesh should be more detailed.

p.s. Do you want the mesh? Or would you rather recreate it in Cloudcompare yourself?

General / Re: LIDAR Point Cloud Mesh
« on: September 18, 2020, 11:52:14 AM »
Hey Darko,
unfortunately, I don't see an easy and fast approach considering the type of data and your intented use case.
If you don't mind sharing the LIDAR cloud, I'd be happy to take a look at it.

General / Re: Minimum percent overlap
« on: September 18, 2020, 11:37:56 AM »
You fail to mention, that this is done with highly specialized equipment, such as metric cameras....
One needs a accurate DEM to compute an accurate orthoimage. With consumer-grade equipment you will not be able to achieve that with a 60% forward and 25% sideward overlap.

General / Re: I9-9900K upgrade
« on: September 18, 2020, 11:31:33 AM »
Hi Henrik.
I've just been in a similiar position on upgrading my PC and I had the same questions regarding the benefits of high core count.
In the end, I went with the Threadripper 3960X (24 core). On the one hand, it is very convenient to be able to just assign half of the cores to Metashape and being able to continue working on something else without much lag (I have a dedicated GPU just for display).

If you work with chunks, you can process multiple chunks in separate instances of Metashape, which increases perfomance (somewhere at Pudget that possibility was even mentioned).  In addition, I work with other software (Blender, GIS etc.) which can utilize the cores more efficiently. And I would expect Agisoft et al. to optimize their algorithms for larger amount of cores in the near future since high core count has just recently become so widespread. Also, the amount of PCIe lanes the TRX40 platforms offers can be quite useful when working with many M.2/ PCIe SSDs.

If you have any questions, feel free to ask away.

p.s. for a cluster you will need a separate license for each node.

Bug Reports / Re: - Private messages broken (?)
« on: September 17, 2020, 10:17:48 AM »
Hi Alexey,
seems like this bug has been fixed.

Dear Agisoft team,
is it possible to tweak the settings to change the resolution of the images used for generic preselection?
Being able to adjust this setting would let the user decide the balance between accuracy and processing time.

Bug Reports / Re: - Private messages broken (?)
« on: September 15, 2020, 02:48:50 PM »
Alexey, thank you.
And James, thanks for the work-around!

Bug Reports / - Private messages broken (?)
« on: September 15, 2020, 12:42:11 PM »
Hi all,
in the "My Messages" section, the contents of received messages are overlapping each other, making it impossible to read. Tried on chrome and firefox, both exhibit the same behaviour.
Is anyone else experiencing this?

General / Re: create orthomosaic using imported dem
« on: September 15, 2020, 12:18:17 PM »
Have you tried using a projected coordinate system (such as UTM)?
Which format are you using to import the DEM? Does it show up in the correct position?

General / Re: create orthomosaic using imported dem
« on: September 15, 2020, 12:35:12 AM »
Hi cwm,
did you check the bounding box (region)? Try resetting it.

Ah, it took a while but I finally understand your predicament. Excuse my naive input!
Since the value is used to preselect images, have you tested the ones stated in your example above (or similar ones with a large variability) and checked the matching results? The amount of matches should be a good indication for the type of input expected, or?

Hi andyroo,
just as a quick thought: Entering the altitude above sea level would not be useful for the actual purpose this value serves. Quote from above "... to make the preselection procedure work efficiently."
For estimating which overlapping images could possibly match, it would make a lot more sense to have the actual distance from image to surface (as well focal length etc.).
Does that make sense? It definitely has been a wild year...

General / Re: Depth maps
« on: September 10, 2020, 05:19:28 PM »
Hi Alexey,
what's the difference between the export with Python scripting and the EXR images in the .files folder?
Is the approach with python scripting based on the existing mesh, whereas the images in .files folder are the actual basis for generating the mesh?

General / Re: Camera Alignment Settings
« on: September 10, 2020, 05:16:01 PM »
It depends a bit on the type of project, usually the default settings are a pretty good starting point. Sometimes I increase the key points to 80.000 and tie points to 6000, afterwards using the gradual selection filter. And depending on the overlap, I also use "Adaptive camera model fitting".
Let us know, how it works out for you.

General / Re: Camera Alignment Settings
« on: September 10, 2020, 04:59:44 PM »
Hi Anton,
one thing that might help: Using generic preselection the image is downsampled to find potential matches before actually matching the images in full resolution. Since the apples surface is fairly homogeneous and even the available features are fairly similiar to each other, you might want to try unchecking generic preselection. Depending on your image count, it might take a lot longer but I had a couple of projects where this approach yielded way better results.
Good luck!

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