One way to prevent this from happening in the first place:
In Options/Preferences..., un-check the option "Transfer material from operand". Pro has that-- right?
Transferring the material from the operand (subtrahend) is what causes what you experienced Bill.
With this option checked, when doing a 3D Subtract, with Materials already assigned to the Objects in the operation, the face(es) that the subtrahend intersects with the minuend will take on the Material of the subtrahend.
Some time ago, I was surprised and enlightened to read Henry write that assigning Materials was one of the last steps he does in modeling. Not the last step, but nearer the end then I originally imagined.
"Thank You" to Andy H. for making me aware of this option in Options/Preferences, a few months ago. ~Alvin
« Last Edit: February 05, 2015, 05:53:34 PM by Alvin Gregorio »
Intermittent TurboCAD user since yr. 2000 (ver6.5). No formal CAD Training.
---TurboCAD: V21PP; V20.2PP; V19DL; V11.2Pro; Windows-7-Pro/64-bit; Intel-Core-i3 CPU; 2.27ghz; 4GB RAM; Intel HD Graphics (CPU based)