Tag Archives: morph

Nov 12 2014

Blend CHOP tutorial.

The Blend CHOP. TouchDesigner 088. 2014.
The Blend CHOP is a special multi-input CHOP. It can combine CHOP Channel values using different weighting calculations.

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Let’s examine the blend CHOP.

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The blend CHOP is very powerful,
but its usage can be difficult
to understand.

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Unlike other CHOPs that combine
multiple inputs, the blend CHOP
uses its first input as a
controller.

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The reason for this architecture
is that the blend CHOP can
control an arbitrary amount of
inputs.

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The second input is a base
value.

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These are the values that all
other inputs will be compared
to.

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This network uses 3 states, plus
a base state.

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We will use the “Difference”
method for blending the incoming
channels.

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The states of “rx”, “ry”, and
“rz” represent rotations, and
they are applied to a geometry
component by using Python
expressions.

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The base state is 0 rotation.

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Adjusting its amount with the
controller has no effect.

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This is because we are using the
“Difference” method.

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Try using the “Proportional”
method to blend in the base
state.

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Now I increase the amount of
influence of state 1.

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Again, notice that the base
state is only calculated as a
comparative starting point.

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I’ll increase the influence of
state 1 to its maximum value.

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No other states are influencing
the blend.

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In this way the blend CHOP can
be used as a simple switch.

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Now I’ll begin combining states.

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The blend CHOP calculates state
influences in real time.

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It can be used as a way to morph
any type of value or state in
Touch Designer.