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See Curves for more information on RenderMan curve and its attributes, curves default to tubes in RenderMan. Camera facing/billboard curves are not supported. but ribbons will be rendered if user normals are supplied. |
To render the curve, we need to add at least a width attribute unless huge curves and hair are what you want.
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- Add a width attribute with Attribute Create. Set a width value at the bottom, e.g. 0.01 and connect the nodes. It will automatically pick up the new value.
ROP Node settings
Under Rendering > Dicing you will find the global control Minimum Width to control the minimum width in pixels of rendered curves. Smaller values (or 0) may take longer to render as curves smaller than a pixel width may be missed and require more min samples from the rendering quality settings.