aligning phase problem - stop and doesn't proceed

Development Asset Creation
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1

Hi All,

something go wrong in aligning phase,
i have around 1500 photos from drone, gps data, and some control point.
In aligning phase:
progress bar stopped,
total time count go on,and
finish estimation time dosn’t update…

it is the first time i found this problem.

i appreciate a lot If anyone have some suggestions.

Have a nice day
Paolo

2

Hi Paolo,
what are your alignment settings?
Also, what are your PC’s parameters?

3

Hi Otrhan,

I tryed a lot of alignment settings, anyway i found that RC have some problems to mix georeferenced target data, my pc is
AMD Ryzen 9 5900HX
64GB RAM
GE Force RTX 3070

Now i’m working on other project and i found similar problems, in this case alignment works fine but the positions of targets are about 60 meters error and RC can’t reach to put them in right place.

Thanks

4

Hi Paolo,
Generally, most of the processes in RealityCapture are out-of-core apart (not dependent on the RAM) from the Alignment process (registration of cameras).
RealityCapture will use all available RAM if it leads to faster computation. Otherwise, it splits jobs so that it fills into the Windows System memory (SWAP). So technically 16GB is enough for reconstruction, texturing, etc - but more RAM could lead to faster processing.
Memory consumption during the alignment phase depends on the number of images (not size) and the number of detected features per image. For the default setting of 40 000 features per image (Alignment setting), you can expect the following boundaries:

  • 2,000 images - 16GB RAM
  • 4,000 images - 32GB RAM
  • 8,000 images - 64GB RAM
  • 16,000 images - 128GB RAM
    By decreasing the number of detected features to half you can approximately decrease the memory consumption by half as well. The approximate formula is: RAM = features x images x 200 bytes.
    So it depends on your alignment settings.

About that 60 m error. I assume that the targets were measured, so try to turn off the geoinformation for the images (you can set No in the Use camera priors for georeferencing in the Advanced alignment settings) and then align your data again.
For drones there use to be a big height error, as the measuring of height is mostly from the surface, not above sea level.

5

Thanks Otrhan,
i restarted the process, now it works well, probably i made some error manging coordinate system.
Thanks again