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Author Topic: Vertice merging too aggressive in Out of Core meshing  (Read 2797 times)

wojtek

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Vertice merging too aggressive in Out of Core meshing
« on: May 20, 2020, 02:58:04 PM »
Hey,

It seems that the seam merging for each of the meshed regions in depth based meshing is a bit too aggressive, it creates a topology far sparser than the rest of the model. This makes the model pretty hard to smooth out afterwards for example (this topology will create visible errors).



Alexey Pasumansky

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #1 on: May 24, 2020, 08:10:52 PM »
Hello Wojtek,

Can you specify, which mesh reconstruction parameters you are using (including the target face count number)?
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Alexey Pasumansky,
Agisoft LLC

Mak11

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #2 on: May 24, 2020, 08:12:33 PM »
Alexey
I'm getting the same thing on Ultra High with 10M+ polys.

Mak

wojtek

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #3 on: May 25, 2020, 03:25:55 PM »
Hello Wojtek,

Can you specify, which mesh reconstruction parameters you are using (including the target face count number)?

This was built with Custom facecount set to 0, Ultra(60mpix images). It is the same mesh I included for this report: https://www.agisoft.com/forum/index.php?topic=12211.0

Do you need the entire project to test this?

Alexey Pasumansky

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #4 on: May 25, 2020, 09:21:42 PM »
Hello Wojtek,

Thank you for additional information. I think that we do not need the dataset, as the issue might be related to zero face count used.

Mak, can you please confirm, if you are observing the same problem, when the target face count is set to 0?
Best regards,
Alexey Pasumansky,
Agisoft LLC

Mak11

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #5 on: May 26, 2020, 12:31:36 AM »
Alexey,

Didn't try with face count set to 0 yet. I'm observing it mostly on meshes with custom face count set to 20 / 30 or 40 M polys (or higher). Seems like the higher the polycount the more noticeable it is.

Mak

wojtek

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #6 on: May 28, 2020, 11:38:22 AM »
So I think what happens here is that the border welding doesn't scale beyond what "High" facecount would be and so when we set a custom value above it (or 0) the welding is disproportionately aggressive. And with how the decimation works these areas are preserved unless we decimate down to what 'High' would be.

Alexey Pasumansky

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #7 on: May 28, 2020, 04:20:10 PM »
Have you checked, if the problematic areas exist if the custom face count is used, but it is below the 'undecimated' polygon count?
Best regards,
Alexey Pasumansky,
Agisoft LLC

wojtek

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #8 on: May 28, 2020, 08:49:54 PM »
Have you checked, if the problematic areas exist if the custom face count is used, but it is below the 'undecimated' polygon count?

I double checked for you, same result just less/more worse depending how close to the High polycount i end up at.

wojtek

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Re: Vertice merging too aggressive in Out of Core meshing
« Reply #9 on: May 28, 2020, 10:11:25 PM »
Perhaps an Ultra High setting for mesh faces would also be welcome? (let's say 4x density of what High is, for the very smooth result. That gives us the headroom we get from using Custom values now)