About scanning a bust with a turntable and a rotating camera.

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15 comments

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    tingelbobber

    1) try to fill the picture more with the object, you are covering more background instead of the object itself

    2) hide the hole background, try to make it black or green, the color doesnt matter, the software detects to many features i think.

     

    i think the biggest problem here is the background, on each cycle the background is more prominent than the objeckt. try to hide it with back fabric, so there are no features to detect for the software. 

     

    Edit: i tried also a turntable setup one time, had the same issue, so the only problem was the background, i coverd it all with white fabric, so the software only "sees" the object, not any detail of the background. 

     

    I like your "truntable" like setup very much, well done

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    ShadowTail

    By the looks you do not adjust the reconstruction region to only cover the area of interest before you start the reconstruction. My advice is to do that after alignment.

    That way the back wall becomes a non-issue as any features detected there are discarded.

    Also, the statue or bust itself is pretty much featureless which can cause problems in itself.

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    tingelbobber

    When the alignment is initially broken, setting reconstruction area does not help i think. The aligned must be correct in order to get a correct reconstruction. I would also suggest to use the forum search and type "turntable", there are many post like this one here :)

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    Nightingale

    Thanks to all for your replies.

    I think that the Software needs a background to make a reconstruction.

    I cropped the pictures around the bust and it's worse.

    I only get the wall with the poster.

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    tingelbobber

    you are right the software needs a backround, but you make one mistake here, you have to rotate the hole background with your object. :)

    so far i have understood, you make a pass with your cam on your lego train, then you rotate your object. in the next pass you are capturing the rotated object, but the feature rich background is at each pass the same, thats the problem.

    Did you try to import only one pass of images, without rotating the object? i think then the images should align correctly.

    And the software needs features to detect, the software makes no decision what is a background or an object you want to capture. So no background, no features, no problems :)

     

    Also try this settings: https://support.capturingreality.com/hc/en-us/community/posts/115000773791/comments/115000547791

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  • Avatar
    Nightingale

    My workflow is:

     

    I start with the wagon located at "01".

    Take a picture.

    Rotate the turntable (15°).

    Take a picture

    Rotate the turntable (15°).

    Take a picture.

     

    And so on until we have a whole turn (360°).

     

    Then locate the wagon at "06".

     

    And so on ...

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    stevenramsey123

    your rotating the object and leaving the background stationary so all the alignment is to the background, Add a plate to the base of the object so that rotates the same as the object and remove the background to be black

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    Nightingale

    Hi.

    For each photo I made a mask within Photoshop.

    Here a sample (photo, mask)

     

    Where can I Import the masks into RC ?

    Thanks.

     

     

     

     

     

     

     

     

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    tingelbobber

    https://support.capturingreality.com/hc/en-us/community/posts/115000777351-Masking-

    They wrote:
    "To explain the masking in RealityCapture - even we do not have a tool for editing masks build in our app, the app itself supports masks to some extent. For alignment step all you need to do is to modify image color channel and paint it with a solid color. This will cause that natural features will not be detected there and thus will not influence camera alignment. For meshing we support alpha-channel masks. Adding alpha channel and masking only important parts actually speeds up whole computation. Another benefit is that you would not need to use reconstruction region to filter parts which are not important."

    So just fill the background with a black color. As i mentioned before, its the same like taking the photos on a solid colored background.

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    Nightingale

    Thank you to remind me. So it's not possible to import the mask directly

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    Nightingale

    Hi.

     

    I have started replacing the background with full black color.

    At the beginning I got good points cloud.

    But the more I add photos the worse it becomes.

    No more points cloud or very few ones.

    I do not understand at all.

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    Nightingale

    Here is the very bad result with 96 photos with black background.

     

     

     

     

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    Nightingale

    I stated that :

     

    With 50 photos the alignment is not so bad,

    All photos are checked green.

    With about 100 photos the alignment is very bad. 

    Only 2 photos are checked green.

    What did happen ?

    Each photo has a very good quality.

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  • Avatar
    tingelbobber

    I think you are almost done. I think the last problem is, you have a very featureless object. Try to raise the alignment settings like in this post:

    https://support.capturingreality.com/hc/en-us/community/posts/115001363732-Align-setting

    Also consider to use Markes placed onto the rotating part of your construction like:

    https://support.capturingreality.com/hc/en-us/articles/360003869672-How-to-use-Detect-Markers-Tool-experimental-version-

     

    Also try to use the forum search here, it helped me a lot when i having any problems with RC. There are many posts like yours.

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    Nightingale

    Hi,

     

    I made a lot of tests and it doesn't run at all. 

    Impossible to make the alignment.

    I tested the samples with other software and I get a good mesh.

    So I don't understand what happens with RC.

    Do I have to use marks or is it possible without using them ?

     

    Thanks.

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