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- Select the curve's shape node (select the curve in the outliner and press the down arrow).
- Add a RenderMan primvar named rmanNN
- main menu > Modify
- Add Attribute...
- Long Name = rmanNN
- data Type = Vector
- Change rmanNN in the curve shape node to anything but 0, for example, 2701, 10, 3600.
- This will supply the curve with a normal and twist the curve.
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Maya Scene > flat_curve.ma.zip
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This image is rendered entirely with curves generated with Paint Effects.
To create Paint Effects, open Maya's Visor window: Windows > General Editors > Content Browser. Find the Paint Effects tab, click on a brush type in one of the folders, and then draw in the Maya viewport.
Paint Effects strokes that use a Brush Type "Paint" are rendered directly as curves by RenderMan. It isn't necessary to translate to a mesh, although in some cases you may wish to do that. You can find the brush type on the brush node after drawing a stroke.
After creating a Paint Effects stroke a couple extra steps are required to set up a RenderMan material for rendering. Shading for Paint Effects brushes is not fully translated. However, a Cs (color) primitive variable is emitted for the curves, so you can make use of that in a material assigned to the stroke. PxrPrimvar > Color Input
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To learn more about RenderMan Primitive Variables in RenderMan for Maya, check out the About Primitive Variables page:
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