Point Lasso greyed out under Alignment

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    Lucia CR

    hello, this is not a bug:

    for reconstructed models (mesh), you need to use Lasso from the RECONSTRUCTION tab,

    the Points Lasso in the ALIGNMENT tab is just for point clouds (not reconstructed models)

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    BenjvC

    Thank you for clarifying. I then tried with the Lasso from Reconstruction tab, but then that doesn't support Find Images. To note, the ability to select a section of points from the point cloud, to then find related images, to do this in the context of searching for overlapping photos between two Components, that's most useful, but sometimes it's not enough. I got a clearer view after running Preview, but then lose my ability to search for cameras in the same way. Might this be a valuable capability to add, to bring back the sparse point cloud to enable the points lasso, or maybe a different approach that yet allows the Lasso in Reconstruction tab to then also allow Find Images?

     

    Thanks.

    Benjy

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    Lucia CR

    Find CPs works just with Camera Rect and Camera Lasso

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    Götz Echtenacher

    Hi Benjy,

    you need to activate the sparse point cloud in the 3D view because the lasso selects those only, not the mesh...

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    BenjvC

    Right, knew that, issue being that the points in a Reconstruction aren't the same as what Alignment allows with Point Lasso to select from sparse point cloud, no access to Find Images. 

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    Götz Echtenacher

    But if you activate the sparse point cloud additionally, does it not work for you then?

    I mean: Scene - Alignment Points - Tie Points

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    Alikhan

    https://support.capturingreality.com/hc/en-us/community/posts/360008738492/comments/360000986271

    How to edit point cloud? what is point cloud lasso for?

     

    I mean how can i delete unneeded points using a point cloud lasso at the alignment stage. just as an exapmle: i have aligned several photos, then got a point cloud, and now i can only create a mesh of an object in reconstuction region. BUT how can i delete all unneede point in reconctruction region? OR how can i save a piont cloud of what is in reconstruction region. and again what is point cloud lasso for

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    BenjvC

    Hello Alikhan,

    After Align, a new Component(s) forms containing a sparse point cloud, but only after clicking Preview, Normal, or High does your Component now feature tie points, these being selected from features that were detected during Align, but then were found as common features between overlapping photos or cameras. What were simply 2D features now have a Z value for their depth. If you enable "Tie Points" under the SCENE tab, the Lasso tool is made active under RECONSTRUCTION, you can then select unwanted points to then apply Filter Selection to delete them (forms a new Component), or — most useful — you can rotate the model to identify separations in a wall due to misalignments> click Find Images to locate the problem children cameras> disable them> run align to form a new Component without those cameras. A this stage RC doesn't have all the cameras you want active, but at least your Component won't contain that particular group of misaligned cameras, which only causes problems with control points showing a red exclamation point (high reprojection error (when you're confident your CPs are good), also the problem of inviting more misalignments downstream when bringing in other photos, gets too complicated to parse this out how the problem ripples through a dataset. Once you have this "wrinkle" ironed out, delete the older component containing those disabled cameras, as the tie points in that Component will inform (pollute) any Align in that scene, a good practice to omit really small components, they're strong candidates for misalignments, then  go back and re-enable those cameras> run align again> RC now creates new tie points for those cameras and uses the strength of a clean(er) Component to bring these cameras back into play.

    This kind of thing simply takes lots of practice to get a feel for, stick with it.

    Benjy

    www.photo2topo.com

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