Level: 3rd, 4th, or 5th
A ribbon. A ribbon is drawn with a smoothly curved plane. Thickness of the plane is also changeable.
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See also the common attributes for primitives. Most options such as radius, color are described there.
Initial and last index in chain. The "last" value must be bigger than "init", and the POINT having the values init-last must exist. See POINT element for further information. These value are ignored in LOCAL and GLOBAL, but are REQUIRED in CHAIN.
Thickness of the ribbons. (This setting is also valid in LOCAL and GLOBAL)