How to set Segments of Extrude Geometry

Questions
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1

I am going to add displacement map to endwall.
The end wall was built by ExtrudeGeometry.

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Is it possible to add segment like this?
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2

This is just to let you know the question is not quite clear, as it allows different interpretations:

  • if you want to add segments (e.g. thin red vertical lines), you need to find their end points and connect them – all end points are along the perimeter of the pentagon shape of the wall
  • if you want to split the wall into vertical plates, then you have to create your own geometry for each of the plates – the end points will be used again
  • if you want to add a texture that repeats horizontally (e.g. imitating vertical plates) you could modify the UV coordinates
  • if you want to add a texture as displacement map, then you must support it with sufficient vertices, as displacements work only if there is vertex; otherwise, you could use bump maps, they are simpler than displacemaps and do not require dedicated vertices
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