Blender Stack Exchange is a question and answer site for people who use Blender to create 3D graphics, animations, or games. It only takes a minute to sign up.
Sign up to join this community
I want to make a procedural material to create a panel that has grime following the edges of the face, sort of like an old retro texture, or a minecraft block. It needs to work on stretched faces as well.
The main difficulty is that I don't know how to make it follow the edges of all said faces in the model.
If you are using Cycles, there is a Pointiness attribute to a Geometry (shader) Node that can detect and highlight harsh angles representing "edges". This only works in Cycles and does not work in EEVEE, unfortunately, and will not always give you the result you want (it can often depend greatly, and sometimes unintuitively, on the angles of your desired edges).
I suggest first testing it by connecting the value through a ColorRamp directly to the Material output and adjusting the sliders until you can see what it's doing (as you can see from my image the sliders generally need to be very close together to isolate only "thin" areas).
If you think it catches the edges the way you like, you can then go ahead and use it as a Mix Factor between your Panel Material and your "Grime" Material:
abs(max(max(x, y), z)) - of course will only work if all flat faces are aligned to 4 cardinal directions or up or down...
$\endgroup$
Jun 20, 2021 at 9:12