Forum

Author Topic: Merging dense cloud  (Read 5777 times)

nicokalo

  • Newbie
  • *
  • Posts: 27
    • View Profile
    • Photographe corporate paris
Merging dense cloud
« on: November 08, 2018, 06:50:55 PM »
Hi there,

I'm trying something. I've read somewhere that it could be interesting to make a medium dense cloud, a High dense cloud and to merge them to have a somehow better High Dense cloud.

The thing is, I tried but I can't make it happen on Photoscan.
Here is what I have
Chunk 1 : High Dense cloud (83,500,000 points)

Copy of Chunk 1 : Medium Dense cloud (19, 300, 000 points)

I aligned the chunks based on both camera and points.
And I merged the chunks.

But each time the merged Dense cloud is only 19, 300, 000 points and is identical to the medium one.
Is it possible to do better than that ?

Thanks for your help.
My website as a professionnal photographer in Paris.
Photographe institutionnel paris
Photographe corporate paris

Alexey Pasumansky

  • Agisoft Technical Support
  • Hero Member
  • *****
  • Posts: 14846
    • View Profile
Re: Merging dense cloud
« Reply #1 on: November 08, 2018, 08:19:11 PM »
Hello nicokalo,

Was the chunk alignment operation successful? Do both chunks have [R] or [T] mark next to their labels prior to merging operation?

Also can you please specify the method of chunk alignment used? There's no option to use both camera based and point based options, only one of them is possible.
Best regards,
Alexey Pasumansky,
Agisoft LLC

nicokalo

  • Newbie
  • *
  • Posts: 27
    • View Profile
    • Photographe corporate paris
Re: Merging dense cloud
« Reply #2 on: November 09, 2018, 01:53:44 AM »
Thank you for your reply.
In deed I have one chunk a [S] and the other as [T].
This happens either if use the camera or point based alignment.

Which is weird because the chunk 2 is a copy of the first chunk. They should align easily no ?
« Last Edit: November 09, 2018, 11:49:02 AM by Alexey Pasumansky »
My website as a professionnal photographer in Paris.
Photographe institutionnel paris
Photographe corporate paris

Alexey Pasumansky

  • Agisoft Technical Support
  • Hero Member
  • *****
  • Posts: 14846
    • View Profile
Re: Merging dense cloud
« Reply #3 on: November 09, 2018, 12:19:37 PM »
Hello nicokalo,

I have followed your approach and everything works as expected. So can you please check that both dense clouds are set as active in the source chunks prior to the chunk merging operation?

The alignment procedure in similar case should be the following:
- process the first chunk,
- scale and reference first chunk, if necessary,
- duplicate chunk,
- process duplicated chunk (hopefully you do not optimize camera alignment or re-align the cameras),
- run Align Chunks operation using "Camera Based" approach with "fix scale" option unchecked, using the first chunk as a reference,
- merge chunks.
Best regards,
Alexey Pasumansky,
Agisoft LLC

nicokalo

  • Newbie
  • *
  • Posts: 27
    • View Profile
    • Photographe corporate paris
Re: Merging dense cloud
« Reply #4 on: November 09, 2018, 04:47:30 PM »
Well I tried but when I align (camera based) my two chunks instead of having R, the copy (who was S) becomes T.
Hence that must be why the merging does not work.

But that's really weird, this should not happen right ?
My website as a professionnal photographer in Paris.
Photographe institutionnel paris
Photographe corporate paris

Alexey Pasumansky

  • Agisoft Technical Support
  • Hero Member
  • *****
  • Posts: 14846
    • View Profile
Re: Merging dense cloud
« Reply #5 on: November 09, 2018, 06:11:05 PM »
Hello nicokalo,

It should work in the same way with only scaled chunks. Also you can check, if you can just ignore chunk alignment operation - try using Show Aligned button on the toolbar to see, if both chunks have the same location, then just use Merge Chunks operation.
Best regards,
Alexey Pasumansky,
Agisoft LLC

nicokalo

  • Newbie
  • *
  • Posts: 27
    • View Profile
    • Photographe corporate paris
Re: Merging dense cloud
« Reply #6 on: November 09, 2018, 11:57:17 PM »
Hello Alexey,

one again, thank you for your most valuable help !

I think something is wrong with my file.

I attached to screenshot.
One before the alignment, and the second one after.

As you can see, the after is really not aligned.

Do you think I should use Point based alignment ?
My website as a professionnal photographer in Paris.
Photographe institutionnel paris
Photographe corporate paris