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Let’s examine the feedback TOP.
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In its simplest form, the
feedback TOP loop consists of 3
operators.
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First, we begin with an image to
operate on.
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In order to see the effect of
the feedback loop, we need some
sort of animation here.
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Next, we need a feedback TOP.
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The feedback TOP needs to send
it’s output to an operator that
can combine itself, and the
original image.
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The feedback TOP must then
reference that final operator,
which will close the feedback
loop.
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In order to see the effect of
the feedback loop, we must
animate the original TOP.
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We start with a circle TOP, and
control it’s center position
with a 2D slider.
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We normalize the initial slider
values to a range of -.5 to .5.
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This becomes the circle’s UV
offset.
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—
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Now, I’ll move the 2D slider.
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As you can see, the effect of
the feedback loop is very
apparent.
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We can use the reset button on
the feedback TOP parameter panel
to clear the effect.
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This network illustrates a more
comprehensive feedback loop.
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It’s basically a duplicate of
first network, with additional
downstream TOP operations being
performed on the feedback TOP.
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The first TOP is a luma level
TOP. It performs a very
important function in the
feedback loop.
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By reducing the opacity of the
feedback TOP, each successive
copy in the feedback loop will
fade a little bit more.
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As you can see, each slight
transformation we successively
apply to the feedback network
causes the feedback effect to
change or shift with each
repeating copy.
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A small shift or change will
gradually grow or shrink over
the life of the feedback loop.
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It’s possible to create several
different types of feedback
behaviors, including color
shifts over time.
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Now that the feedback loop is
ready, we can use the 2D slider
to see the effects of our
settings.
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The concept of feedback loops in
Touch Designer is very powerful,
and you can create very
surprising effects by
experimenting with effect
chains.
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