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Messages - cbnewham

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Bug Reports / Re: reduce overlap -> empty bbox
« on: September 19, 2020, 11:12:01 PM »
I'm getting this too.

There appears to be no solution. Decimating the mesh does not work. Creating a new chunk and building a new low-res model does not work.


General / Re: Dealing with out of focus areas
« on: August 30, 2020, 03:17:09 PM »
Two answers to this problem.

You could use focus-stacking software to achieve focus over the entire object. Once you've processed the photos, then put them into Metashape.

You could also photograph it in small sections. I photograph life-size effigies using hundreds of photos with areas no bigger than 30x30 cm. Metashape reconstructs them as expected.

General / Re: Filter Dense Cloud not available?
« on: August 09, 2020, 02:30:28 PM »
Export the dense cloud.

Decimate in something like CloudCompare.

Import the decimated cloud.

General / Reduce overlap feature
« on: July 30, 2020, 02:16:09 PM »

I think the new feature for disabling images with a lot of overlap is a nice idea. Unfortunately, I have not found this of use. Even if I set the overlap allowance to "high", the resulting model is very noisy compared to using every image (image sets of the order of 800 to 1000 images).

I don't know the details of how the overlap is being determined (presumably by looking at the surface of the rough model that is needed in order to determine overlap, to see how much is shared between images).

It would be nice if there was an alternative method, which I think would work along the lines of removing cameras that have a close spatial distance and view orientation (perhaps ignoring rotation). For my cases, I think that would remove quite a few similar pictures without impacting the resulting model.

General / Re: Best Laptop for Metashape?
« on: July 08, 2020, 01:29:38 PM »
I've been using a Razer Blade 15 with 64 Gb of memory since October last year.

It's very good for photogrammetry. However, as a laptop for general use I'm not that impressed - especially with the non-standard keyboard that inverts the position of the shifted and non-shifted characters on each key. Weird. The screen also suffers from slight flickering displaying certain mid-greys - I'd have preferred a standard screen that didn't have this problem over a 144 MHz fast refresh that does exhibit the problem.

But that said, overall it's a fine laptop - and runs very very cool.

General / Re: No points found for photo with detail
« on: January 03, 2020, 11:46:49 AM »
Thanks Alexey.  I need to find a better example. Will post again when I find one.

General / Re: No points found for photo with detail
« on: December 30, 2019, 12:48:45 PM »
I don't know what you mean by inconsistent. The images are naturally lit and of surfaces which are not smooth and have detail. Feature detection is based on details in the images and the fact that there are no points being detected suggests something strange is going on.

General / Re: No points found for photo with detail
« on: December 29, 2019, 12:13:43 AM »
My projects have more overlap than is good for them (because they are sculptures with heavy undercutting) and the lighting is always good. Anyway - if no features are detected (the photo I provided) then no matches will be found, of course.

As I said before, I think there is a problem with Metashape - unless feature detection is different to how I imagine it works.

General / Re: No points found for photo with detail
« on: December 28, 2019, 09:40:02 PM »
My understanding is that the blue points are the matched ones, the grey ones are unmatched.

The photo with no points has no specular reflection.

General / Re: No points found for photo with detail
« on: December 28, 2019, 03:50:45 PM »
I currently haven't got an example to hand with similar views, but here is one with the same area of the subject. One photo with no points and the other with many. There's definitely something odd going on with how Metashape is detecting points. I also don't understand why Metashape seems to like clustering points around one area of a photo rather than distributing them more evenly if the photo has detail features across the entire photo - I've seen that happen more than a few times.

General / No points found for photo with detail
« on: December 26, 2019, 10:38:53 PM »
My projects are usually 400 to 1200 images in size. I have noticed for a few of them that no points are found for a few photos where there is plenty of detail. I've tried masking any background or blurry foreground out and I've also tried varying the total number of key points at the start but it makes no difference - the same photos always come back with no points - that is, zero points, not just points that weren't matched - during the initial processing phase and hence can't be matched.

I attach an example (the attachment is 25% of the original photo size). Other similar photos from the same area of this sculpture with similar photographic viewpoint produce hundreds of points.

Why would this be?

Thanks so much Alexey!  The new version now keeps the camera where it is - and I'm no longer losing my mind.  :)

I notice it still resets after a save to file, but that's not a big problem and I'm more than happy that it no longer resets when re-aligning.

This has to be the worst aspect of MetaShape!  It's driving me crazy.

Can't believe it's a "feature request". It's a bug (which is where I raised it initially - under General - until it was moved to this forum section), not a feature.

Come on AgiSoft. Please fix this! It can't be very hard to do seeing as you don't move the virtual camera during a "reset camera alignment" and you seem to know where the default virtual camera is that it keeps resetting to after an alignment.

General / Re: New article on photogrammetry / Metashape
« on: December 11, 2019, 10:50:28 PM »
Thanks Alexey.

General / Re: New article on photogrammetry / Metashape
« on: December 10, 2019, 01:18:59 PM »
That would be a nice thing to do.

I don't see any way to submit the article for the article section of the AgiSoft site - so I'm not sure how that works. Perhaps the webmaster has to do it.

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