Missing details when scanning objects with POP 2

Hi,

i am definitely a beginner at 3d scanning so therefore one may forgive me obvious beginner’s mistakes.

I use a POP 2 scanner to scan some smal figures like a goat of a Christmas crib, a small duck of my children and a porcelain angel. As supporting tools I used the 2-axis tunrntable in a photo box that has a LED ring at the top. I tried to have the distance “excellent” and to have per angle a 360° turn.

The result is not bad but based on other results I miss details in the result. How can I imrprove the results? Or should I do a (re-)calibration of the scanner?

Here are my first results:

Kind regards
Florian

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Make sure you fuse the point cloud at 0.1mm and mesh it at level 6 denoiser level 3

You see the preview of Revo Scan do not show all the details , it is more on the smooth side than the actual results .

If you keep your scanner at the distance of exactly 15 cm from the center of the turntable , you will get the sharpest results.

I don’t think the angel was that bad at all , of course you will not get fine details with 0.1mm resolution here , but if you keep the proper distance you can get better.

The Excellent indicator is for distance between 15-25cm and the best details works at 15cm . So try again .
Also get a little down with the Scanner on the tripod, just a slightly because the only sharpest will be the head … try to have the 15cm distance between the scanner front and the middle of the turntable and forget about the indicators in the software .

Remember you not taking picture or video of the object , it has 3 dimensions so you need to capture the 3 dimensions , scanning just one angle will scan only 2 dimensions and the third will be produced by the software not reflecting the reality resulting in smoother details .
So to get the best results lower the scanner down a little bit and keep it at the proper angle .

Thanks for your valuable tips. I’ll try that the next few days and then let you know here if I make progress.

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Looking forward to see your progress Florian , take your time .

Hi @PopUpTheVolume,

I finally found the time to some more tests based on your recommendations. I tried to keep the distance at about 15 cm and also took over the suggested fuse and mesh settings.

Here are the results:

1. MAN duck

Duck - Distance 15 cm - Fuse Settings

Duck - Distance 15 cm - Mesh Settings

My estimation:
Quite good result.

2. Garden Gnome

![Garden Gnome - Distance 15 cm - Scan Settings|690x474]


(upload://3XvC20IuC2o4dXz3rmQArxUVyS9.png)

Garden Gnome - Distance 15 cm - Result - 2

My estimation:
Needed to make several indivudal scans and had to clean and merge them with Revo Studio. Result is not that good how I expected it. Any ideas how to improve it?

3. Bevel gear (broken and glued together again to be able to print it once, I had to use a 3D scan spray)

Gear - Distance 15 cm - Result Merged - 1

Gear - Distance 15 cm - Result Merged - 2

My estimation:
I scanned it with 3 different angles and stored each scan as individual file. In Revo Studio I cleaned the point clouds and merged it then together. I guess it would still need some polishing but the result should be sufficient for my purposes.

Where you maybe could help me to understand the usage of the exposure settings of the depth camera. How do I know which is the best setting for the scan:

  • As little blue (= underexposure) and red spots as possible? Or is just blue bad and red ok?
  • Choose the exposure setting with with you see the most details (points) of your scanned model?
  • How is the automatic mode really working? I click on auto and then place the rectangle around my object. And then?
  • Is there any rule how to choose the best setting for exposure?

So I think I have still a lot to learn but this but this trip is a lot of fun for me. :slight_smile:

Hi! Did you always scanned only 360°, without overscanning same area? Also, what are you calibration values? You might need to do the calibration to improve the results.

Hi @ivan,

of course I scan the object not only once with a 360° turn.

I place it in different positions and pause after each 360° turn and let Revo Scan find the track where to resume. If it looses track I store each 360° as individual file and merge it afterwards together with Revo Studio.

You could try scanning for max 360° in each position an saving those scans as point clouds (ply) individually and combining them later on (for example in cloud compare). :thinking:
Or fusing the clouds before continuing scanning because pausing and scanning for another rounf after changing the position would mean you scan different part over and over which makes more noise.

@PopUpTheVolume can correct me if I am wrong. :no_mouth:

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Hi @flotux , you suppose to not over scan your models and scan only one pass each time as Ivan mentioned
From your preview the duck looks the best , the other was scanned with multiple positions and looks less good .

Changing position will over scan the model many time so it may not be as sharp as only one pass.
Professional people never scan more than 360 rotation per scan .

And then merge the multiple parts .
You doing already progress but try to learn the other way and see the results .

Don’t forget to have some fun !
You doing good job already and the first scan looks very good .

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