Separation - Alignment Issue – RealityCapture Support

I'm struggling with bringing together a complicated cave chamber, 1829 images taken at different times such that the hard structure in the stone is largely unchanged, but there being significant rearranging of the furniture in the surface features of a big mud bank. Here's a six-panel view of the older imagery on top, new on bottom:

These two sets of images, about 1200 and 630 respectively, do return a single component, albeit with a major separation in the wall and floor:
The separation marked in red is clearly related to what's evident in the Inspect tool, the left cameras not tied in to the ones on the right, these relating to the old and new capture sessions. So while elsewhere, areas not featuring mud, with its ephemeral surface features, the old and new photos played well together in joining into a single component, this side of the room not so much.

There are more images from the old set that I'd love to tie in to ones not seen here, but provide coverage of the mudbank from lower down, the convergence is too extreme to allow tie ins. Shooting from the top of the mudbank without slipping was challenging enough, and from the bottom you just can't get the camera high enough. I can return with an extension pole, but my question here is about pushing what's possible in the software. Any thoughts?

I wish I could tell RC to not consider any features related to the mud in the new images, i.e. masking. I guess I could do this in Photoshop and export with alpha channels, something to try.

Götz Echtenacher

March 20, 2018 07:24

Hi Benjy,

I'm not so certain that the problem is caused by the mudbank. Did you activate "show matches" and check how the tie points are distributed? If there are plenty of gross errors there, then I think masking would help. If there aren't many tie points to begin with, it might not be too successful. You did not by any chance put some stakes as permanent markers into the mud? And I assume you use exif grouping? Have you tried setting Preselector to 20k? Saved my a** once...

March 20, 2018 07:26

20k might be worth considering as permanent setting since you use quite a high image resolution...

March 20, 2018 07:27

Don't forget to raise Max Features per Image/MPX as well...

Separation - Alignment Issue

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