How To Make a Radial/Curved Scratches/Noise in a curved, radial or bent object surface?

How To Make a Radial/Curved Scratches/Noise in a curved, radial or bent object surface???..

i want to know how can this be achieved within blender, substance painter, or photoshop techniques…

radial scracthes for example the ones you see a brushed flat round surface of a metal, of in a curved surface when some sandpaper is passed and follows the surface, but i mean not for only scratches but also any details you can place there (in a image used as mask/texture)

and even the radial scratches details you are get with a angle grinder in metal…

well i mean this not something that affects metal only, but any or most of materials, but what i want to know to is the way to project an straight scratch texture/mask (i guess it has to be straight and not bent, but getting it bent into the object’s surface is the desired result)…

Hi, I found this PS tutorial could be usefull:
https://www.youtube.com/watch?v=eRSjKsbkLuQ
Also c4d tutorial could give you a clue:
https://www.youtube.com/watch?v=3nHiSdUvFWE

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this also solves the radial one https://www.youtube.com/watch?v=nrcHOMUWJbI
ok but i still find the curved/bent one a bit more complicated to replicate either procedural or manually…

and this technique shown here https://www.youtube.com/watch?v=kpS-GRasQ4Y might be a bit convoluted to do it for a scratch texture, but it seems the only hack possible as a manual way for now…

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Do you have image referance to the curve/bent scratches?

basically this same noise pattern you get with the radial noise metal but straight instead, and then bake (i suppose is necessary :sweat:) that into a tileable texture (and do some little editing in photoshop to remove obvious seams), then use the other technique to project it into a complex curved surfaces…

yeah if we are talking about complex model with a lot of bendy, and curvy surfaces, then is a convoluted process, so i wonder how i professional texture artist would do it with other software as substance painter…

For “curved scratches” as in curved random directional actual scratches on a surface (like from from floor traffic), it’s best to create/paint seamless image. Then you put it onto the surface using coordinate scrambler or some other texture scrambler method.

For “scratches” as in machine abrasive toolmarks, like on a lathe, I have method to create seamless texture over one seam direction in Blender. This works perfectly when the UV distribution is straight and regular, and the UV layout can also be used to drive the anisotropic tangent.

Simple mill operations on planar surfaces are also possible to achieve. I used to use secrop’s method for this, but it was a bit specialized. Recently someone improved on it making it more generalized and easy to use on any flat surface regardless of orientation.

But for a complex 5-axis mill path on curved surfaces? Forget it. You’d need the toolpath to create a vector direction (flow map) image for the tangents, and then use the toolpath to stencil in the toolmarks themselves. You can handpaint flowmaps in Krita, but still, would probably go nuts even attempting this. I’m not aware of any CAM software that can create good renders based on toolmarks, but these can often have a decorative purpose.

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