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Let’s take a look at the switch
CHOP.
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The switch CHOP is a commonly
used operator.
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It allows for the switching of
any different type of CHOP.
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It has a minimal set of
parameters.
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Its inputs are indexed starting
with 0.
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Index entries that are higher
than the number of inputs are
ignored.
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Fractional entries are rounded
down to the closest integer.
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Here I use the index .5, which
rounds down to 0.
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I’ve built this network to
further illustrate the concept
of channels and samples.
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We have a circle TOP whose R, G,
and B parameters are set to
evaluate the 20th sample of the
switch CHOP.
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CHOPs can hold any arbitrary
number of channels, and each
channel can hold any arbitrary
number of samples.
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Therefore, the switch CHOP will
hold the exact number of
incoming channels and samples.
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I’ll change the Python
expression to evaluate only the
1st sample of the switch CHOP.
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When the index set to 0, we
select the 1st input.
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It only has 1 sample.
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Index 1 will select the 2nd
input.
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We can middle mouse click on the
CHOP to determine how many
samples it holds.
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It has 600 samples, and we are
evaluating only the 1st, in this
case a value of 0.
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The 3rd CHOP has sixty samples,
also starting with a value of 0.
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I’ll set the Python expression
to evaluate the 500th sample.
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Since only the 2nd input to the
switch CHOP has at least 500
samples,
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the Python expression will give
us the last available sample
from the other inputs.
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Input 1 has only 1 sample,
therefore the Python expression
evaluates to the value .5.
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But what about the 3rd input,
index 2?
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Shouldn’t it evaluate to a value
of 0, which is the value of the
last sample?
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We should have a black circle,
but it’s grey.
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Touch Designer gives us the
ability to change the way
out-of-range samples are
evaluated.
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I’ll change the “Extend Left”
and “Extend Right” parameters to
“Hold”.
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Imagine now a straight line
instead of a repeating cycle of
sample values.
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Now the 500th sample evaluates
to 0, which is the last actual
sample value in the 3rd input.
