Is it possible to change which pixels Metashape prioritizes when generating orto

[vcarreira]

As far as I know, Metashape and other photogrammetry software prioritize nadir-facing pixels when creating orthomosaics. Is there any way to change this?

[rtfraser86]

following, as I just came here to ask this exact question

[dpitman]

Build the ortho.  Then draw a polygon around an area you are not happy with.  Right click the polygon and select "Assign Images".
You will get a list of the images that contain that area and you can try them to see if any of them provide a more acceptable render.

[vcarreira]

Build the ortho.  Then draw a polygon around an area you are not happy with.  Right click the polygon and select "Assign Images".
You will get a list of the images that contain that area and you can try them to see if any of them provide a more acceptable render.

Thank you, looks like I can do this to select oblique positions instead of nadir. I'll create another topic to know if there is any documentation regarding the assign images ranking.

[dpitman]

Thank you, looks like I can do this to select oblique positions instead of nadir. I'll create another topic to know if there is any documentation regarding the assign images ranking.

Note that there is only a very small amount of area in the center of each image that can be described as "NADIR".  All the rest of the area between images is interpolated.  So, when you say you are selecting an oblique image to replace a nadir image, that is most likely not true.  Unless of course you have other than nadir positioned images in your set.

Distortion generally occurs between seam lines in the ortho.  If a seam line occurs on straight line or patterned area, then it can show distortions or offsets.  Replacing the area with the method shown is a way to use one image (or a combination) for the entire selected area in order to remove the offset or distortion caused by the interpolation process to make it look nicer.

[Dieter]

I'd like to join in the discussion. I have a slightly different point of view that I'd like to discuss.
With orthophotos, preference is always given to images that are parallel to the line of sight of the orthophoto. This works very well with aerial photographs without large elevation changes.

However, with 3D objects that have surfaces almost parallel to the line of sight of the orthophoto, this no longer works.
Photos that look poor are selected. If you look at the creation of a tiled model, you'll see a difference compared to an orthophoto. Here, images that are perpendicular to the surface are used. I've been wanting this option for creating orthophotos (for years).

This option could save us a considerable amount of time in our daily work.

Dieter