Extrusion node
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The **Extrusion** node generates a 3D signed distance function of a shape based on
its (2D signed function) input extruded along the specified axis.

.. image:: images/node_3d_sdf_operators_extrusion.png
	:align: center

Inputs
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The **Extrusion** node accepts an input in 2D signed distance function format.

Outputs
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The **Extrusion** node generates a signed distance function of the
extruded version of the input shape.

Parameters
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The **Extrusion** node accepts the *length* of the extruded shape 
and *axis* to be extruded from as parameters. 

Example images
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.. image:: images/node_sdf3d_extrusion_sample.png
	:align: center
