TYPE: CHOP
TITLE: Composite CHOP

This CHOP layers (blends) the channels of one CHOP on the channels of
another CHOP. The first input is the base input and the second is the
layer input.

Over the interval of the layer, the layer channels are blended with the
base channels. The contribution of the layer is eased-in and eased-out
according to the Start, Peak, Release and End parameters. The base is
unaffected outside the interval of the layer.

The Effect parameter determines the amount of contribution of the layer.

If Base Hold is 0, the layer input will completely replace the base input
when the effect is 1. If Base Hold is 1, the layer will be added to the base.

The interval of the output starts at the minimum of the base and layer.
The interval of the output ends at the maximum of the base and layer.
The base's extend conditions are used if the layer lies outside the base.

If the third input is supplied, the Effect page will be overridden by the
third input's first channel, which should contain the effect values over
the range of the layer.

Parameters:
Composite
    Base Hold        - Determines how much of the base to             /base
		       blend into the output at points where
		       the layer has an effect.
    Match By         - Matches channels in the base input with ones
		       in the layer input by either index or name.
		       Channel Union causes layer channels that are
		       not in the base to be added to the output.
    Quaternion Blend - Aids in producing smooth rotation blending.
		       The "quaternion" attribute should be in
		       the input CHOP. See the Attribute CHOP.
    Shortest Path Rotation Blending - If on, compensate for cyclic channels
                       (such as angles) by always choosing the shortest 
		       route between samples when blending.
    Rotation Scope   - Defines which channels are rotations for
		       Shortest Path Rotation Blending.
    Cycle Length     - The length of the cycle for Shortest    /cyclelen
		       Path Rotation Blending.
Effect
    Effect           - Sets how much the layer affects the          /effect
		       output. If 0, the output is the base.
    Unit Values      - Sets the meaning of the next four
		       parameters - either absolute values,
		       relative to the start/end of the channel,
		       or relative to the current frame.
		       The layer and base are never shifted.
    Start            - The beginning of the composite               /start
		       interval. Effect is zero at this point.
    Peak             - Where the composite operation reaches        /peak
		       maximum effect. This value is held
		       until the release point.
    Release          - The point at which the effect begins         /release
		       to fall back towards zero.
    End              - The end of the composite operation's         /end
		       effect. The effect reduces to zero again.
    Rise/Fall Shape  - The shape of the segment between the Start and
		       Peak indices, or between Release and End.

Local Variables
    C  - The current channel index (0 to NC-1).
    NC - The total number of channels.

See also: Blend, Sequence
