I am not sure whether you are referencing a check box setting, or whether you are suggesting a check scan of objects. I have found references to backface in the documentation, but cannot find anywhere to adjust its settings for an individual surface. As you will see below, the Options setting for Backface is ‘Use front face settings’.
I ran Analyse | Diagnostics | Check, and all objects are valid.
I have attached the material details for one of the ignored objects.
I have attached my settings for Technical view.
Here is the Object Description for the same ignored surface:
ID: ea6d28fe-23bf-44b4-b1cd-50dde258f2e6 (3124)
Object name: (not named)
Layer name: Shell Lower A::SLA Endeavour
source = from obj
index = 1688
UserData ID: CE28DE29-F4C5-4faa-A50A-C3A6849B6329
description: User text (0 entries)
saved in file: yes
copy count: 51
Trimmed surface with 1 hole(s).
“U”: degree =1 CV count = 2 (0 <= U <= 90)
“V”: degree =1 CV count = 2 (0 <= V <= 43.8)
13 boundary edges
Edge Tolerances: all 0
Vertex Tolerances: all 0
Render mesh: 1 basic custom mesh 78 vertices 74 polygons
Analysis mesh: none present
UserData ID: 6ADBBF65-A1D4-4d54-A0C8-BFAAB1A6086D
description: Technical Drawing Data
saved in file: no
copy count: 1