Converts channels of all its input chops into binary channels and combines them using a...
This CHOP converts channels of all its input chops into binary channels
and combines them using a variety of logic operations.
0 is considered
1 is on.
Result of Channel and CHOP input Operations
Result (Number of Channels in Output)
|Off||Off||Total number of channels in all inputs.|
|Off||On||Number of channels in the first input.|
|On||Off||Same as the number of inputs.|
The method to convert inputs to binary on/off.
|Channel Pre OP|
Unary operations can be applied to each channel.
Operation applied between channels within each input.
Operation applied between corresponding channels of multiple inputs.
Channels matched between inputs by number or index.
Inputs that don’t start at same frame can be aligned.
|Off To On|
The script executed when an output channel switches from off to on, called at the first “on” frame. You can use variables like $C and $I in the command.
The script executed when an output channel is on. Called once per channel that is on, each frame.
|On To Off|
The script executed when an output channel switches from on to off, called at the first “off” frame.
The script executed when an output channel is off. Called once per channel that is off, each frame.
Some of these parameters may not be avaiable on all CHOP nodes.
To determine which channels get affected, some CHOPs have a scope string. Patterns can be used in the scope, for example
The following are examples of possible channel name matching options:
|Sample Rate Match|
The Sample Rate Match Options handle cases where multiple input CHOPs’ sample rates are different.
The units for which time parameters are specified.
For example, you can specify the amount of time a lag should last for in seconds (default), frames (at the Houdini FPS), or samples (in the CHOP’s sample rate).
When you change the Units parameter, it does not convert the existing parameters to the new units.
Time Slicing is a feature which boosts cooking performance and reduces memory usage. Traditionally, CHOPs calculate the channel over its entire frame range. If the channel does need to be evaluated every frame, then cooking the entire range of the channel is unnecessary. It is more efficient to calculate only the fraction of the channel that is needed. This fraction is known as a Time Slice.
Causes the memory consumed by a CHOP to be released after it is cooked and the data passed to the next CHOP.
The Export prefix is prepended to CHOP channel names to determine where to export to.
For example, if the CHOP channel was named
You can leave the Export Prefix blank, but then your CHOP track names need to be absolute paths, such as
Every CHOP has this option. Each CHOP gets a default color assigned for display in the Graph port, but you can override the color in the Common page under Graph Color. There are 36 RGB color combinations in the Palette.
|Graph Color Step|
When the graph displays the animation curves and a CHOP has two or more channels, this defines the difference in color from one channel to the next, giving a rainbow spectrum of colors.
The current value.
The current index.
The current channel (0 to NC-1), the total number of channels.