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I have a semi-cylinder and I'd like to highlight the arc on the front, made of lots of vertices and smoothed. How can I highlight this? Best would be some kind of coloured glow to represent the arc. I tried using a wireframe modifier but it seems the wireframe requires an actual shape, not just a line of vertices. I wasn't able to add a glow to just the vertices either.

Semicylinder

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You can select the vertices you want and duplicate them. Right click to send them back to their original position. Then press P and select Separate by selection.

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Go back to object mode and select your new object. If your selection has any faces, enter edit mode and delete only faces.

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At this point you have a circle, or a loop, or maybe just a line of vertices. You're now able to convert this to a curve from Object mode.

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You can give this some bevel depth.

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And then apply a shader. For example, volumetric emission.

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Freestyle.

Re question title Highlight Specific Edges of a Shape, fear it would be remiss not to throw freestyle into the ring as an option

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Created a simple line set and added the arc edges to it. Gave some thickness and a stroke color of yellow.

How to add a freestyle stroke to a specific edge in blender?

Then removed any other freestyle influence.

Is it possible to deselect freestyle edges?

Blender Freestyle - how to make line crossings glow more than lines themselves?

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  • $\begingroup$ I tried this and only selected the edges of the arc, but it's highlighting more than I actually selected. Any ideas? imgur.com/a/TtHoSBv It may have something to do with using ctrl+r to make new vertices and pushing them to the edges to make the corners sharp. $\endgroup$
    – Doot
    Jan 16, 2021 at 19:51
  • $\begingroup$ Possibly. Can you select the unwanteds and "Clear Freestyle Edge" ? $\endgroup$
    – batFINGER
    Jan 16, 2021 at 20:01

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