Tag Archives: resolution

Nov 12 2014

Switch TOP tutorial.

The Switch TOP. TouchDesigner 088. 2014.
The Switch TOP allows you to control image flow in TOP networks.

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Let’s examine the switch TOP.

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The switch TOP is a simple
operator, but it can help you
understand concepts that are
essential to the Touch Designer
2D workflow.

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In this network, the swith TOP
has 3 inputs, and I’m using a
slider to change the index
parameter of the switch TOP.

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By default the slider outputs of
floating point range of 0 to 1.

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We use a math CHOP to re-range
the values from 0 to 2.

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The TOP named “moviein1” is
index 0, “moviein2” is index 1,
“moviein3” is index 2.

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We’ll use a Python expression to
reference the re-ranged slider
values.

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We click the “viewer active”
button on the null CHOP, then
drag the channel name to the
index parameter of the switch
TOP.

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We could also type the Python
expression by hand.

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Lets look at the “Blend between
inputs” parameter.

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Without blending, the switch TOP
changes between inputs in
discreet steps.

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Its important to realize that in
some situations, blending can
increase operational overhead,
and slow down Touch Designer.

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I’ll turn blending back on, and
we’ll examine how the switch TOP
deals with discrepancies in
image sizes.

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We can middle mouse click on any
operator in Touch Designer to
display an information popup.

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The image size of “moviein1” is
800 by 450, “moviein2” is 512 by
512, and “moviein3” is 1600 by
900.

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I’ll change to switch TOP back
to its default settings.

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Under the common tab, we have
two important parameters, the
output resolution and the output
aspect.

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As I switch between inputs, we
see the switch TOP changes its
resolution and aspect to match
the incoming operator.

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If I enable blending, we see
that even though there is a
smooth transition between the
input images, the resolution and
aspect of the switch TOP still
jumps in discrete steps.

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In cases where all the input
images are the same size, this
is obviously not a problem.

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We can override this behavior by
adjusting the output resolution
and aspect parameters.

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I’ll change the resolution to a
custom size.

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We can choose between some
standard options, or create any
resolution we like.

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Now, I change the “Output
Aspect” parameter to
“Resolution”.

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This matches the aspect to our
new custom resolution

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Now we can switch between inputs
of varying sizes without jumps
in resolution.

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