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I am a beginner and need help modelling this structure in Blender.

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2 Answers 2

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Draw the profile of your road:

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Extrude:

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Bevel the edges in order to round (CtrlB):

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Give your object a Simple Deform modifier, Bend mode, 360° on Z, add some edges in order to have something round enough, move the mesh away from its origin if you want to increase the inner radius:

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Give it a Solidify modifier to add thickness, enable the Even Thickness option:

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Final version with the following modifier stack: Simple Deform, Weld, Solidify, Bevel, Subdivision Surface:

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You can use Bezier Curve ... start with Circle, Subdivide few times, few control points move up on Z axis ...

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Under Curve Properties > Geometry > set Extrude and set Bevel > Profile > Resolution 1 and move middle point to corner to get right angle.

Or instead of Bevel use Solidify modifier.

Set shading from Smooth to Flat a nd increase Resolution from 12 to 36 (under curve properties).

To orient extrusion in correct direction change Tilt to 90° for all points and for points on top of waves set 75°.

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For some control points I changed handle type.

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