Texture anomaly

Answered

Comments

11 comments

  • Avatar
    Wishgranter
    Hi Benjamin
    It's NOT a corrupt file. It looks like misalignment plays a big role in the missing wall areas. Place some control points to verify the alignment. If you get 2+ pix reprojection error, then it’s for sure the misalignment in play - why is the wall not reconstructed properly...
    0
    Comment actions Permalink
  • Avatar
    BenjvC
    To clarify, this same Composition was output without either problem I described, a) wrong texture information (most visible on what should be dark pile of sticks), and b) empty sections in wall after Reconstruction. Misalignment certainly explains both problems, had the thought that color was reprojected from a camera that previously aligned, but that somehow now referenced another image file, projected wrong color from there. If something caused cameras to lose their link to correct images, what could account for that?

    My next step was to run Alignment again, lose my coordinate system, so have to redo all Reconstructions, but heh. The previous 1195 cameras wouldn't realign into the same Composition, it breaking into two Compositions in this very area with the issues, making me suspect that this erroneous link from a camera(s) to source images is the culprit.

    I can try exporting .rcalign files and merging into a new project, try a few things.

    Thanks,
    Benjy
    0
    Comment actions Permalink
  • Avatar
    Wishgranter
    Hi Benjamin
    It’s not that RC lost the link to images, the results of texturing are just all from source images, if you have more images with a dark subject ( underexposed ) and then lower amount of a lighter ( overexposed ) subject on them, then weighing ( more images with "dark" pixels in the same spot ) will take the more images where it‘s darker.. So plan this, or disable some images... or do postprocessing when the texture comes out, and you WON‘T lose the coordinate system, only get it in a different position ( only if you change the COORDINATE SYSTEM ).
    0
    Comment actions Permalink
  • Avatar
    BenjvC
    I understand that about the need for consistent levels across photos, that's not what happened here. Each of the photos showed the pile of sticks dark brown, which rendered that way in several Reconstructions, then suddenly those sticks appears with very light color, none of the images containing that for rotting sticks. I had experienced some system issues, lost and restored a drive containing some of the source imagery, perhaps something got mixed up in that process. Anyway that's now resolved, back to where I was.

    I misspoke, didn't lose coordinate system, I lost position. Is there a way to export coordinates via control points or such to position a new Reconstruction using the same imagery, tie-ins, etc.?

    Thanks,
    Benjy
    0
    Comment actions Permalink
  • Avatar
    BenjvC
    Wishgranter,

    After a redo, new Reconstruction, this issue with wrong color on sticks went away. Unfortunately, long story, but had to redo once more, and this time the identical anomaly reappears. This time you see there's no wall missing, but the Maximal error is a whopping 427.

    Max_error.JPG


    You said anything over 2 would explain these small UV islands of light rock sprayed all over the pile of dark sticks (and much more), but I have a few observations and questions. First, the Median error and Mean error are under 1, so could that mean there's an outlier in there somewhere, one really messed up camera or such? Additionally, these nearly 1200 camera poses dispersed throughout the cave produced (in chunks) a seamless model where texture on every rock and feature is otherwise in place.

    poses.JPG


    If this weren't some outlier spoiling the group, wouldn't you expect a Maximal error in the hundreds to show problems all over the place?

    In searching for answers I was going through Help and took a look at Shortcuts, need to spend more time in there, but noticed under Scene View 3D the following:

    shortcuts.JPG


    I wanted to use these to possibly point to the problem child (or children), but found them inactive. Are these tools not included with RC Promo?
    0
    Comment actions Permalink
  • Avatar
    Kruzma
    Benjamin von Cramon wrote:
    In searching for answers I was going through Help and took a look at Shortcuts, need to spend more time in there, but noticed under Scene View 3D the following:
    shortcuts.JPG

    I wanted to use these to possibly point to the problem child (or children), but found them inactive. Are these tools not included with RC Promo?

    Hello Benjamin,
    this tools work only for tie points(alignment), not for reconstructed mesh.
    Select 3D view, go to 3D SCENE context TAB in the reibbon and check 'Tie points' to show tie points in 3D. If you use this shortcuts, they should work.
    0
    Comment actions Permalink
  • Avatar
    Wishgranter
    Hi Benjamin
    Can you make a screenshot of your ALIGNMENT settings ?
    Is it possible to get the RCPROJ files+folder and images for inspection ?
    0
    Comment actions Permalink
  • Avatar
    BenjvC
    Alignment Settings:

    Settings.JPG


    If there were a way to retain position when exporting .rcalign I could simply try again, but now getting this other problem again:

    Export_failure.JPG


    I'd gladly share .rcproj and imagery, but am tapped out for online storage.
    0
    Comment actions Permalink
  • Avatar
    Wishgranter
    Hi Benjamin
    You are trying to export COMPONENTS again and features for the images are already lost. And components have not been designed to be stacked. If you need to export it again, select all images ( in the particular COMPONENT ) and change FEATURE SOURCE from USE COMPONENT FEATURES to USE ALL IMAGE FEATURES, then look at the CONsole view and use the ALIGN button, and watch that all images get detected features and cancel the ALIGNMENT process. then you can export the COMPONENT as you wanted ( So you get all features detected again and so it can be reexported )
    0
    Comment actions Permalink
  • Avatar
    BenjvC
    Right, I left out the Align step and stopping it part, need to make a note. Thanks.
    0
    Comment actions Permalink
  • Avatar
    Wishgranter
    Hi Benjamin
    regarding the high reprojection error, please click on the 2 COMPONENTS in that project to see what sort of reprojection error you have there - whether it is from the 2 COMPONENTS or you get it just after the alignment
    0
    Comment actions Permalink

Please sign in to leave a comment.