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Messages - beldridg

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General / Mac Studio system performance
« on: December 01, 2023, 06:56:21 PM »

Santa is looking to give me a Mac Studio for Christmas but he doesn't know which one is ideal in terms of cost vs. performance for Metashape. Specifically, it is worth it (i.e., do you get more performance for the $$) to go with the M2 Ultra or should I stick with the more affordable M2 Max?

Thanks for any help or suggestions.


- brett

PS - I'm only considering a Mac at this point. I'm not a Mac fanboy but I am a heavy Unix user and it is really the only option. I've never owned a Windows system in my life and don't plan to start now.

General / Delete Depth Maps
« on: July 19, 2023, 08:04:39 PM »
I'm always running out of disk space. :)

Quick question: Once a project is completed, is there any value / need to keep the depth maps? Even if I were to add additional photos, I would need to regenerate them all anyway, right?

Also, if I ever wanted to color correct (I do underwater models), as long as I have the mesh, I don't need the depth maps to build a new texture, right?

I'm just trying to free up some disk space but don't want to delete the depth maps if they are needed for something else.


- brett

I was reading through the manual (ver 1.8) about the "Accuracy" setting for Alignment.

I have a project on a large shipwreck that involves multiple dives. I basically use incremental alignment with the new photos and have some overlap of photos with the previous dives.

What basically happens is that the new photos have a "tight" alignment with each other and a "loose" alignment with the photos from the previous dive that overlap.

This results sometimes in areas where the two sets of photos are close to being aligned, but not exact and there is a little bit of a "ghosting" effect.

I'm generally using Medium alignment accuracy and generic preselect.

With all that...

In reading the manual, I noticed this under "Reference preselection"

"if the alignment operation has been already completed for the project, the estimated camera locations will be considered when the Align Photos procedure is run again with the Estimated preselection selected."

If I didn't want to start from scratch, could I use this option to increase the accuracy?

If so, I'm assuming I would NOT want to check "reset current alignment" but how exactly would I go about doing it? Would I reset alignment of all photos and then select Align Photos and check the Estimated Preselect?

Or would I just run Alignment with High and Estimated Preselect?

If somebody could clarify, that would be great!

Happy Holidays all,

- brett

General / Re: Depth maps after incremental photo alignment
« on: December 12, 2022, 08:36:39 PM »
Okay, thanks, understood.

Any thoughts on the other question?

If I start from scratch and re-generate all depth maps, what reasons would cause there to be fewer depth maps than aligned photos?

- brett

General / Re: Depth maps after incremental photo alignment
« on: December 12, 2022, 07:40:10 PM »
Thanks, two follow-on questions:

1) If I un-check that option AND I already have some of the maps done, should it just process depth maps for the "new" aligned photos?

2) I have one project where I have 3,404 photos aligned but only 3,377 depth maps were created. What would cause a depth map to not be created for a photo that is aligned? I re-checked that the region included all photos.

- brett

General / Depth maps after incremental photo alignment
« on: December 12, 2022, 06:43:18 PM »
I'm running into some behavior that I think is unexpected. I'm using v 1.8 of the Standard version.

Let's say I align 100 photos and build a mesh which creates 100 depth maps.

Then I align an incremental 20 photos. If I then try to build a "new" model, it doesn't create the depth maps for the additional 20 photos or include them in a mesh.

I have Reuse depth maps enabled AND I don't change any of the parameters (e.g., quality, filtering, etc.).

The only workaround I have found is to basically delete all the existing depth maps and start over. If it was just 100 photos, I wouldn't really care, but it is 1000s of photos.

What am I doing wrong?


- brett

PS - I know that the manual says to disable this setting when there is a discrete GPU, but I've also seen advice to the contrary on the forum.

- brett

General / Question on Use CPU when performing GPU accelerated processing
« on: December 02, 2022, 06:30:00 AM »
I've seen multiple posts on this and I can't seem to find a "best practices" guide on whether to check it.

For example, should I check it if I have a dedicated GPU?

What about if I have an "integrated" CPU in something like the Apple M1 chips?

Should I select it for certain operations and not others?

I've read the manual a couple times and researched some of the forum posts, but I can't find a definitive guide on this.


- brett

General / Reduce Overlap - What is considered a "rough" mesh model?
« on: December 02, 2022, 06:26:41 AM »
I've used the Reduce Overlap function in the past but I have a question about what is meant by a "rough" model?

I have generally built a mesh from depth maps but with Quality = Low and Face Count = Low.

Would it be better to build from the Tie Points? I'm assuming it would be much faster but what do you sacrifice? Accuracy?

Is there any "best practice" for what constitutes a "Rough Mesh Model" as mentioned in the user manual?


- brett

I've been researching "Reduce Overlap" and agree that this would be a great feature.

General / Re: Building a mesh from Dense Cloud vs Depth Maps vs Tie Points
« on: December 02, 2022, 02:08:49 AM »
Thanks for your response.

So, if for example, I wanted to have somebody build a 3D model of just an airplane and not the seabed, I would classify the sand one way and the airplane another and then build just the airplane?

Does that make sense?


- brett

General / Re: Building a mesh from Dense Cloud vs Depth Maps vs Tie Points
« on: November 30, 2022, 07:40:54 PM »
Thanks. What would be the benefit of generating a dense cloud then? I guess you could do certain editing functions before you build a mesh?

- brett

General / Building a mesh from Dense Cloud vs Depth Maps vs Tie Points
« on: November 27, 2022, 02:35:14 AM »
Hi all,

I've seen a few posts about the ability to build a mesh from Depth Maps directly instead of building a Dense Cloud first. I also noticed an option to build from Tie Points.

What are the practical differences in these approaches?

My use case is to build solid models with textures of underwater wrecks and post them to Sketchfab.

I think the "pro" of building from Depth Maps instead of a Dense Cloud is that you would skip the time to generate a Dense Cloud -- but does it increase the time to build a Mesh?

- brett

General / Re: Sparse cloud not updated after incremental alignment
« on: November 26, 2022, 06:37:05 AM »
6000 images is not so large dataset to align - what settings are you using and what format/size of images are being used?

Hi Simon,

They are "out-of-camera" JPG from a Sony a6400 so they are 16MB or so each (dimensions 6000px x 4000px with a resolution of 350dpi x 350dpi).

My settings are Key Point Limit of 40,000 and a Tie Point Limit of 10,000. Generic preselection = No, Reference preselection = No, Exclude stationary tie points = Yes, Guided image matching = No, Adaptive camera model fitting = No.

Thanks for any tips or guidance.

- brett

General / Re: Sparse cloud not updated after incremental alignment
« on: November 21, 2022, 03:43:28 AM »
A quick update on this. I basically figured out what was going on. After "Dive 4" all the photos had aligned; however, a whole slew of them were aligned in a "rats nest" of photos.

Basically, it was a "butterfly effect" where two pictures aligned but the angle was off and then it spiraled in on itself. The photos for the new dive aligned with the photos in that rats nest and so it just got worse.

I finally figured it out and corrected it but it was painful and I learned my lesson. Always do a sanity check to see if things are correct on the sparse model even if they are aligned.

- brett

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