Perlin noise node
~~~~~~~~~~~~~~~~~

The Perlin noise node outputs a Perlin noise texture.

.. image:: images/node_perlin.png

Inputs
++++++

The Perlin noise node does not accept any input.

Outputs
+++++++

The Perlin noise node provides a greyscale Perlin noise texture.

.. image:: images/perlin.png

Parameters
++++++++++

The Perlin noise node accepts the following parameters:

* *Scale X* and *Scale Y* are the subdivisions of the first iteration

* *Iterations* is the number of iterations

* *Persistance* is the weight ratio between 2 subsequent iterations. Lower values of persistance
  generate smoother noise.

Notes
+++++

As with all random nodes, the seed is held by the node's position, so moving the node in the graph
will modify the texture, and the outputs will remain the same if its position and parameters
are not changed.