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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.


  • Map the width attribute to RenderMan attribute with Attribute Rename.


  • Connect the nodes.


Add Curve Interpolation and Basis

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