Nov 12 2014

Info CHOP tutorial.

The Info CHOP. TouchDesigner 088. 2014.
The Info CHOP is a frequently used Operator. It can help you diagnose and monitor performace issues in TouchDesigner.

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Let’s examine the info CHOP.

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The info CHOP is a deceptively
simple operator.

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Its’ job is to place information
about an operator into a CHOP.

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This information can be used to
provide a framework to match the
parameters of other operators
to.

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This network starts with the
default movie in TOP.

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It’s wired to a resolution TOP,
which I’ve used to alter the
settings of the input TOP.

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It’s bypassed for now, and I’ve
wired it to a null TOP.

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The info CHOP references the
null TOP.

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In this example, let’s look at
the resolution and aspect
channels.

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I’ve created a constant TOP.

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This TOP uses the info CHOP to
create its resolution and aspect
parameter settings.

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We’ve used the info CHOP to
match one operator’s settings to
another.

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The original movie in TOP has
resolution and aspect settings
of 800 by 450.

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Let’s look at the resolution
TOP.

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I’ve created a custom resolution
setting of 500 by 100, and a
custom aspect of 5 by 1.

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When I enable the operator by
turning off the bypass toggle,
we see the effect of the
resolution TOP instantly.

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By using the info CHOP, we’ve
created a way to automatically
drive the parameters of one
operator network by changing
another.

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In this example, we’ll use the
info CHOP to help us analyze
Touch Designer’s performance.

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We measure performance by
examining how well our processes
perform by the millisecond.

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We can always middle mouse click
on an operator to quickly get an
indication of its performance.

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But in some cases we need to
analyze performance over long
periods of time, or compare
performance between multiple
operators.

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In this example, I’ve used
select CHOPs to isolate the
“cook_time” channels from two
info CHOPs.

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The first info CHOP is
monitoring a quicktime movie,
the second is monitoring a wave
CHOP.

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I’m looking to spot fluctuations
in performance over time, so I
use a trail CHOP at the end of
the network.

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Since the processing, or cooking
of an operator occurs so
quickly, the trail CHOP is
useful for keeping, and
displaying, a longer term record
of cook states.

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Here, I can instantly see that
my movie playback suffers from
irregular performance spikes.

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Now, armed with this knowledge,
I can modify the input file or
other parts of my network
accordingly.

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