sdAnnularShape node
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The **sdAnnularShape** node generates a signed distance image of an annular shape
based on its input, by substracting a constant from the absolute value of the
distance function (i.e. creating a ring around the shape).

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

Inputs
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The **sdAnnularShape** node accepts an input in signed distance function format.

Outputs
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The **sdAnnularShape** node generates a signed distance function of the
annular version of the input shape.

Parameters
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The **sdAnnularShape** node accepts the following parameters:

* *the distance* to be substracted from the absolute value of the
  function (i.e. half the width of the ring)

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