POP 4 – Recommended lighting (Lux), scanning people and Cross Lines mode

Support & Feedback Issues
1

Hello,
I am a POP 4 owner and I would like to ask for some technical advice about the optimal scanning conditions and the different scanning modes.

1. Recommended lighting conditions and Lux values

Are there recommended ambient light levels for the different POP 4 scanning modes, preferably expressed in Lux?

I am particularly interested in the Cross Lines laser mode. If possible, I would like to know whether Revopoint has a recommended Lux range, or an approximate optimal value, for obtaining the best scanning results with this mode.

I would like to measure the ambient illumination using the light sensor of my smartphone and a Lux meter app, so even approximate reference values or recommended ranges would be very useful.

If there are no official Lux specifications, I would also be interested in knowing what lighting conditions are considered optimal in practice for Cross Lines scanning (for example: low ambient light, normal indoor lighting, avoiding direct light on the object, etc.).

2. Best scanning mode for head and upper-body scanning

Which POP 4 scanning mode would you recommend for scanning a person, specifically the head and upper torso, rather than necessarily performing a full-body scan?

I would also like to know what lighting conditions are recommended for this type of scan.

3. Turntable vs. moving around the object in Cross Lines mode

When scanning small to medium-sized objects using Cross Lines laser mode, is it generally preferable to:

  • keep the scanner relatively stationary and rotate the object on a turntable, or
  • keep the object stationary and manually move the scanner around it?

If one method is preferable, I would be very interested in understanding the technical reason — for example, whether it provides better tracking, accuracy, point-cloud quality, coverage, or reduces alignment errors.

Thank you very much for any technical advice or practical experience you can share.

2

Hi @roberto19

If you scan people in color you will need a good lighting fur the color texture usually soft but light and turntable

However for scanning without color data you absolutely don’t need any lights , Full Field is using Infrared that do not need any lighting so you can even scan in completely darkness .

SK the answer is simple, no you don’t need special lighting setting for scanning objects without color data .

If you scan outdoors you will need to use the included lenses and calibrate the scanner outdoors with the lenses on. After removing the lenses you will need to recalibrate the scanner indoors again.

3

Absolutely you can keep the scanner stationary while using a turntable , the scanner can’t be fixed in one position when using laser modes for scanning , the scanner need to move gently back and forth and up and down to capture all angles n three dimension.

You can use the turntable and let the object spin slowly , but the scanner still need to move , fixing the scanner stationary will results in artifacts on the surfaces like lines .

Since laser mode uses markers , the tracking is registries the moment you hit the scan button and locked in , so as long as the markers moving together with the object in relative positioning it is ok even if you move the scanner back and forth .

Collect as much frames as possible starting from minimum 8K to 36K depends of size of the scanned object and complexity.

4

Full Field: if you scan without color the lighting is not much important

Hybrid : the lighting is not as important but good to have since the Hybrid mode use pixels as tracking so interior controlled light is ok, nothing special requires this action

If you go for capture textures you will need a good soft box light to avoid harsh shadows

5

Thank you very much for the detailed answers.

Your explanations have clarified all three points, especially the use of the turntable in Cross Lines mode. I had assumed that keeping the scanner stationary while rotating the object might be preferable, so your advice to still move the scanner gently to capture different angles and avoid surface artifacts is particularly useful.

The information about lighting and the differences between Full Field, Hybrid and color/texture scanning is also very helpful.

I will apply these recommendations in my next scans with the POP 4.

Thanks again for your help!

6

Hi @roberto19

You welcome , I use simple desktop arm ( microphone stand ) to get off the load of my arm while holding the scanner for much longer and still can use turntable but also gently changing position of the scanner each 360 rotation to avoid the artefacts in the center , you can use it with all laser modes this way .

Full Field use structured light technology and full frame so there are no issues when the scanner is stationery and also very much preferable to avoid blurred frames .

When using Turntable

  1. Laser mode : move the laser each 360 rotation
    Light is not nesesery for scanning no color data

  2. Full Field mode : keep the scanner stationery each 360 rotation/angle ( light is not nesesery for scanning no color data)

  3. Hybrid & 3DGS mode : keep the scanner stationery and change position/angle each 360 rotation . Lighting requires , avoid extreme windows lighting like direct sun light from the window when not using Lenses , color data requires soft box lighting . 3DGS works in most all lighting conditions

  4. Use manual setting for Exposure & Color Balance before starting capturing any color data .