Feedback & tips for metalic surfaces

[AdrienB]

Hello there,

I'm on a tricky project and I'm looking for tips !

I've to scan a set of aluminium / pewter tubes ( around 60-70 tubes ) for a metrological project from an orthophoto.
It have to be quite precise, mainly for their positions from each other.

What I can do and what I have  :

- Spots
- Polarised filter (useless ATM )
- Flash
- Controled natural light/shadow
- Photoshop for raw

What I can't do and what I miss :

- Direct operation onto the surface ( spray, ... )
- moving the tubes on a turntable

These tubes are in a wood structure so there are some nice non-metallic marks

The result must be an orthophoto from the mesh

I've done a first attempt, 60% them are really bad, 20 % just bad and 20% quite good. Don't understand why some are goods.

Is there anyone with a good idea to improve my process ?
I thought that I could use something like projected light pattern onto the tubes ...
Replacing white burned part of the tubes to another color in photoshop ...

An idea ?
Have a good day