CHAIN
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## CHAIN

### Description

Level: 3rd

A chain contains a series of POINTs, which is usually atom positions, and is used to draw COILs and RIBBONs. See COIL, RIBBON, and POINT for detail about CHAIN

A chain must have at least four POINTs. Very short chains with less than four POINTs are simple ignored. This limitation comes from the Catmull-Rom method, which is used to intepolate POINTs.

### Parent Elements

SCENE

### Child Elements

RIBBON, COIL, POINT

### Attributes

N (type:Int) = 3

  Number of points inserted between adjacent two points with Catmull-Rom method.

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