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See Curves for more information on RenderMan curve and its attributes such as how to turn on round curves.

To render the curve, we need to add at least a width attribute, curve interpolation and basis.

Add Width Attribute

Add a width attribute with Attribute Create. Set a width value at the bottom, e.g. 0.01.

Houdini 21 > Curves in Houdini > width_attributecreate.png

Houdini 21 > Curves in Houdini > width_attrrename.png

Houdini 21 > Curves in Houdini > curvegeo.png

In your ROP, select Edit Parameter Interface and add ri_curveinterpolation and ri_curvebasis. Set the interpolation and basis accordingly.

Houdini 21 > Curves in Houdini > curveEditParm.png