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This question already has an answer here:

I have a cylinder (imported from Creo, in .obj), to which I've added a material, steel and rendered it. It looks great.

I've now cut it in half, and want to see a different texture on the cut face, how do I do that in Cycles?

I tried diffent tutorials from that site but doesn't work with Cycles and imported .obj.

Here is an outside view:

outside view

Then, when cut, the blueish part should show the cutting tool path leaving marks in the metal.

cutting tool path

Marks or scratches could be like this.

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marked as duplicate by Ray Mairlot, Community Apr 13 '16 at 19:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Okay, I think I found a way (since unwrapping doesn't seem to work for me).

  1. Select the part, go to edit mode, do a Ctrl+Tab and choose Face

  2. Then select the face of the part I want to add texture to (there's a bunch of little triangles that need to be selected)

  3. Next, assign a new material to that face, and deal with texture in Nodes.

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  • $\begingroup$ Your question is about scratches, but this answer is just about assigning a different material about your mesh. I think either your original question needs to be edited to clarify what you're looking for or this answer expanded as 'deal with the texture in Nodes' does not explain how to create scratches. $\endgroup$ – Ray Mairlot Apr 13 '16 at 14:55
  • $\begingroup$ Done, edited. I just wanted to know how to place a texture on a single face, it can be scratches, marks bumps or whatever. $\endgroup$ – Alain Apr 13 '16 at 18:43

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