Bad.....Scan object of smooth & Non-Color Surface

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    Erik Kubiňan CR

    Well, I am not quite sure if you have shot in complete darkness or masked these images, but indeed more elements in the scene do quite help RC to tell the motion. I do believe this is being done on a turntable, instead I would recommend you to shoot in a well lit scene with a visible background and instead of shooting from single position with a turntable, you should move around the object. 

    Regarding your pattern you used for the surface and the noise you are experiencing, this is not anything strange. Rather than writing the things down on the object use a spray or chalk powder or whatever works for you that creates many little freckled points all around the surface, while still not covering it completely. 

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    jie

    Hi Erik, thanks for the answer. 

     I shoot with black ground and two light in front of object.

    for pattern i draw to the surface , you said "not anything strange" . i still not sure why my drawing cause that noise , you know some models in sketch fab also has various color in their surface , but their model detail is perfect , why my drawing to surface cause constructed mesh ugly ? how should i judge which model with kind of color in their surface should use spray for that kind of model , confuse a bit.

     

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    Erik Kubiňan CR

    Here is a link to a good visual explanation of how the dusting/coating should be done in order to successfully scan a featureless/structureless object https://www.3dscanstore.com/blog/3d-scanning-reflective-objects
    Please don't take models on sketchfab as a good example as many of them have already been cleaned up/postprocessed. 

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    jie

    very appreciate , Erik.

    can i understand as below:

        structureless object 

           whether feature or featureless , both need coating.

           if I draw marker onto the surface of this object ,  marker will turn into mesh noise.  

        structure object 

          whether feature or featureless  , no need coating.

          if I draw marker onto the surface of this object  , marker not turn into mesh noise ?

     

    is that right ?

     

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    Erik Kubiňan CR

        structureless object 

           whether feature or featureless , both need coating.

           if I draw marker onto the surface of this object ,  marker will turn into mesh noise.  
    No, a featured structureless object would be a massive wooden table for example. It is smooth, it is polished, but yet there is a visible both big and tiny detailed pattern to be recognized as points in space. If an object does not have such pattern, the coating of very small freckles all around the object have to be applied. Markers in this case made no effect as these are huge lines instead of the tiny detail a powder, spray, dirt would make. 

        structure object 

          whether feature or featureless  , no need coating.

          if I draw marker onto the surface of this object  , marker not turn into mesh noise ?
    Structured objects such as a detail of leather or a rock or anything already tend to have enough features either structure or color pattern wise. Unless the structure is repetitive. Noise on the mesh was created because of the unpainted clean solid parts and yet the marker itself creates the same thing. Solid color with no little detail.

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    jie

    Very appreciate for your answer.

    Thanks.

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