Logic CHOP
Summary
The Logic CHOP first converts channels of all its input CHOPs into binary (0 = off, 1 = on) channels and then combines the channels using a variety of logic operations.
NOTE: The Logic CHOP is superceded by more convenient operators like the CHOP Execute DAT or the Text DAT which will run their scripts when CHOP channels change.
The Logic CHOP performs logic operations on the samples in CHOP channels. The channels of a CHOP can be combined into one channel, and several CHOPs can be combined into one CHOP.
With one input CHOP, you can invert the values of each sample. You can also do logic operations on the samples of one channel by the samples in the other channels, reducing N channels down to one. You can combine by applying an "or", "and", etc..
With two or more CHOP inputs, you can combine the channels in one CHOP with the channels in all the other CHOPs, reducing N CHOPs to 1.
To do math operations (add, multiply, ...) between channels or CHOPs, use the Math CHOP.
Parameters - Logic Page
convert
- ⊞ - This menu determines the method to convert inputs to binary:
- Off When Zero
nonzero
- Returns a logical 0 when channel value is zero;
Non zero values return 1.
- Off When Zero Or Less
pos
- Returns a logical 0 when a channel value is zero or less; and 1 when values are positive.
- Off When Outside Bounds
bound
- Returns 0 when channel value is outside the bounds set by the Bounds parameter below.
- On When Value Changed
valchange
- Returns 1 when the channel value changes.
- On When Channel Name Changed
namechange
- Returns 1 when the channel name changes.
preop
- ⊞ - Once converted by the Convert Input stage, Channel Pre OP defines a unary operation on each input sample:
- Off
off
-
- Invert
invert
- Changes 0 to 1; and 1 to 0.
- Toggle
toggle
- Causes each 0 to 1 transition of the input channel to switch the current state between 0 and 1.
- Radio Button
radio
- Only one channel per input can be on at once. If another channel turns on, the previously "on" channel is turned off.
- Last Two On
radio2
- This is like Radio Button, but it keeps up to two channels on. If followed by a Lag CHOP, it is useful for blending between pairs of poses.
- Rising Edge
rise
- On for one sample only, at each place where a channel goes from off to on.
- Falling Edge
fall
- On for one sample only, at each place where a a channel goes from on to off.
chanop
- ⊞ - Takes the first input and combines its channels, then the second input and combines its channels, and so on.
- Off
off
-
- And
and
-
- Or
or
-
- Exclusive Or
xor
-
- Not And
nand
-
- Not Or
nor
-
- Equivalence
eqv
-
- Lowest Index On
lowest
-
- Highest Index On
highest
-
chopop
- ⊞ - Combine CHOPs combines the first channels of each CHOP, the second channels of each CHOP, etc.. Channels between inputs can be combined by number or name. Combining (Logic) Operations are:
- Off
off
-
- And
and
- On if all inputs are on, otherwise off.
- Or
or
- On if at least one input is on, otherwise off.
- Exclusive Or
xor
- On if one input on, but not more than one.
- Not And
nand
- Off if all inputs are on, otherwise on.
- Not Or
nor
- Off if at least one input is on, otherwise on.
- Equivalence
eqv
- On if inputs are equal (all on or off), otherwise off.
- Lowest Index On
lowest
- Gives the lowest index of the channel that is currently on,
or -1 if no channels are on.
- Highest Index On
highest
- Gives the highest index of the channel that is currently on on,
or -1 if no channels are on.
match
- ⊞ - Channels are matched between inputs by Channel Name or Channel Number.
- Channel Number
index
-
- Channel Name
name
-
align
- ⊞ - Inputs that don't start at the same frame can be aligned. Se the section, Align Options.
- Automatic
auto
-
- Extend to Min/Max
none
-
- Stretch to Min/Max
stretch
-
- Shift to Minimum
start
-
- Shift to Maximum
end
-
- Shift to First Interval
shift1
-
- Trim to First Interval
trim1
-
- Stretch to First Interval
stretch1
-
- Trim to Smallest Interval
trim
-
- Stretch to Smallest Interval
squash
-
bound
- ⊞ - Set lower and upper bounds for when Convert Input is set to Off When Outside Bounds.
boundmin
-
boundmax
-
Parameters - Common Page
timeslice
- Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.
scope
- To determine which channels get affected, some CHOPs use a Scope string on the Common page. See Pattern Matching.
srselect
- ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.
- Resample At First Input's Rate
first
- Use rate of first input to resample others.
- Resample At Maximum Rate
max
- Resample to the highest sample rate.
- Resample At Minimum Rate
min
- Resample to the lowest sample rate.
- Error If Rates Differ
err
- Doesn't accept conflicting sample rates.
exportmethod
- ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.
- DAT Table by Index
datindex
- Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
- DAT Table by Name
datname
- Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
- Channel Name is Path:Parameter
autoname
- The channel is the full destination of where to export to, such hasgeo1/transform1:tx
.
autoexportroot
- This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable
- The DAT used to hold the export information when using the DAT Table Export Methods (See above).
Operator Inputs
- Input 0: -
Info CHOP Channels
Extra Information for the Logic CHOP can be accessed via an Info CHOP.
Common CHOP Info Channels
- start - Start of the CHOP interval in samples.
- length - Number of samples in the CHOP.
- sample_rate - The samplerate of the channels in frames per second.
- num_channels - Number of channels in the CHOP.
- time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.
- export_sernum - A count of how often the export connections have been updated.
Common Operator Info Channels
- total_cooks - Number of times the operator has cooked since the process started.
- cook_time - Duration of the last cook in milliseconds.
- cook_frame - Frame number when this operator was last cooked relative to the component timeline.
- cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
- cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
- cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
- cooked_this_frame - 1 if operator was cooked this frame.
- warnings - Number of warnings in this operator if any.
- errors - Number of errors in this operator if any.
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