>>10829374Which part?
>>10829383It's just a way of faking the look of the indentation.
The illusion breaks if viewed at a glancing angle but since in this case it would be surrounded by the lip of the can this wouldn't happen so it's the perfect use case for it.
You would just draw the indentation in black and white and project it onto the surface which would save you polys and potentially time depending on how complicated the structure is.
Good thing to learn about now that you've got the modeling down fairly well. Look up normal mapping.
