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How can I model the grooves of a ventilation pipe?

Thanks

enter image description here

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    $\begingroup$ What is shown on the image is most likely work for normal or bump maps. Although those can be easily created from highpoly to lowpoly baking so modeling highpoly will be required (shown in the answer) $\endgroup$ – Mr Zak Jul 5 '17 at 15:28
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You may do it fast using the Array Modifier and some basic modeling tools. enter image description here

Add a cylinder with no fill, then subdivide it in the middle with Ctrl+R. Bevel the loopcut with Ctrl+B and set its thickness. Next inset the faces with I to create extra loopcuts for subsurf creasing. Then extrude the loop of faces (E) and scale it along Z and Y axis only (S,Shift+X). Repeat it twice, then inset the faces again. Finally add a Subsurf Modifier and apply the smooth shading. One segment is ready. enter image description here

Add the Array Modifier and set it above the Subsurf. Set the Count number as you like and check the Merge checkbox. enter image description here

To change the angle of the carvings select one in Edit Mode with B, then press Shift+Ctrl+Alt+S to shear it. enter image description here

Finally you may apply the Array, add the Solidify Modifier (to give the pipe a thickness) and add loopcuts (Ctrl+R) at the edges of a pipe. enter image description here

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