# Easy way to add a third dimension to a Circle TOP or SOP?

Is there an easier way to add a third dimension to a circle TOP or SOP?

So I’d love to use a Circle TOP as shown on the left hand side preview as a composite layer for my
output. But I got excited by the idea of being able to present the circle 2D first then rotate it to reveal that it’s in 3D.

I was able somewhat achieve this by using a Circle SOP instead (right hand side) and then making it Open Arc and applying a Line Thick SOP to it. This seems to work fairly well. Now, my issue is, how can I add a third dimension to the Circle SOP? At the moment the Circle SOP has no actual depth to it (it’s basically a 2D circle rendered in 3D space). Is there an easier way to generate the depth of the Circle SOP? I’d like to get it to be rendered like it’s cylinder i.e. not rounded like a torus (the opening of a cylinder is a circle, of the cylinder. a torus rounds out its opening if that makes sense. i’m basically creating a truncated cylinder vs a torus)

Not sure if I know what you want exactly but have you experimented with a Tube SOP - maybe as primitive type or cutting down Detail? I

t is pretty versatile.

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Ah sorry I wasn’t more clear in my explanation. After I read your answer I realized you’re right I can basically just use a tube. However, my main question still remains which is how can I add width to this?

By adding a tube and cutting down the height, I get this. But I don’t have that width that I’m desiring that is the “border width” on a circle.

For comparison here, the left has border width on the circle. The right does not, it only has height.

I’m sure I can do this via some complex maths, but I’m looking for an easy solution to just add that width to this.

Maybe make two cylinders, polygon type, one a bit smaller than other in scale, then boolean subtraction, then copy? Or play with Extrude SOP?

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late to the party, but another option is to use a Tube SOP, set `height` to 0, and make `rad1`: 1.5 and `rad2`: 1
Then Extrude SOP

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