Small Scratch - "Ghost Scratch" Shader - What and Where use

[conio]

Hmm, I guess you could do these kind of materials with the usual combination of maps for the different channels (diffuse, spec, gloss, transparency, anisotropy, etc.).
But you will have to use procedurals or very large bitmaps to capture all this details. And, of course, the sampling will have to be... well... VERY HIGH!!! But, in the end, I think it's (just) a matter of the level of detail, since you can always "zoom in" until you reach a microscopic
level, which is in essence what basic shading models do...

Another way to achieve this might be to do it in compositing. Maybe rendering out normal and uv passes to layer some maps on top of the rendered images... I don't have experience in that though. Just saw something like this in a making of some time ago...

[PauloSampaio]

Hmm, I guess you could do these kind of materials with the usual combination of maps for the different channels (diffuse, spec, gloss, transparency, anisotropy, etc.).
But you will have to use procedurals or very large bitmaps to capture all this details. And, of course, the sampling will have to be... well... VERY HIGH!!! But, in the end, I think it's (just) a matter of the level of detail, since you can always "zoom in" until you reach a microscopic
level, which is in essence what basic shading models do...

Another way to achieve this might be to do it in compositing. Maybe rendering out normal and uv passes to layer some maps on top of the rendered images... I don't have experience in that though. Just saw something like this in a making of some time ago...

thanks conio! its starts to be more clean in my mind.

but I have two more questions:

Why it will have to be a very high sampling?
and for example how this map will look like in anisotropy channel ?

[conio]

So for the anisotropy channel, try searching some tutorials on brushed metals and/or search for the architectual shaders guide from master zap. here is a pretty good explanaion on that.

For the sampling: Well, the higher he sampling is, the more details you will get (and the "smoother" the result will be), and that is essentially what you'd want here...DETAILS.

[Harthorg]

http://area.autodesk.com/tutorials/photorealistic_anisotropy_with_mental_ray_for_maya

Anisotrophy tutorial.

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