Tag Archives: joint

Nov 12 2014

Joint SOP tutorial.

The Joint SOP. TouchDesigner 088. 2014.
The Joint SOP is a very specialized Operator, it creates a controllable series of shapes between two Circle SOPs.

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Let’s examine the joint SOP.

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Before we begin, I’ve included
an important note in this
example network.

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By pressing the “viewer active”
button, and hovering over the
SOP window, then pressing the
“H” key, you can center the view
of your geometry.

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This is a very important
technique in the Touch Designer
SOP workflow.

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We start with a circle SOP and
set its orientation to the ZX
plane.

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We then wire the circle to a
transform SOP.

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We use the transfrom SOP to
create a positional offset.

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I’m animating some parameters
here, so to begin with I’ll turn
those off.

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Let’s move the SOP 2 units in
the Y up direction.

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I’ll reset the rotation
animation of the SOP, and set
its rotation to 0.

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Next, we’ll use a merge SOP to
combine the original circle and
the offset circle into a single
piece of geometry.

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This is the basic type of SOP
setup the joint SOP requires to
operate correctly.

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The joint SOP will create a
series of circles between the
pair of input circles.

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The parameters of the joint SOP
are fairly straightforward.

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We can increase or decrease the
number of divisions.

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We can also offset the
relationship between the newly
formed circles and the
originals.

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I’ve used two noise CHOPs to
animate the offset circle.

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One to adjust the position, and
one to adjust the rotation.

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I’ve used simple Python
expressions to animate the
noise.

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As Touch Designer advances frame
by frame, the channels generated
by the noise CHOP will move
forward in time as well.

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By moving the X transform
forward, we sample a constantly
updated range of the noise.

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A good analogy is this:

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Imagine that you are looking at
a mountain range from the side
window of your car as you drive
forward.

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The height of a single point
along the profile of the peaks
and valleys of the range is the
value we apply to the offset
circle.

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This animation is reflected in
the generation of the geometry
created by the joint SOP.

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Here’s an important note.

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The dynamic creation of geometry
can be computationally heavy,
and it can and affect the
performance of Touch Designer.

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The more circle divisions I
create with the joint SOP, the
more Touch Designer with slow
down.

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