Normal Blend node
~~~~~~~~~~~~~~~~~

The **Normal Blend** node blends two normal map inputs using an optional opacity. The second input is the base
and the first input gets applied on top of it using the *Reorient* method described in this 
`article`__, using the opacity (defined by the *opacity* parameter, or the optional greyscale input).

.. _normalblendpage: https://blog.selfshadow.com/publications/blending-in-detail/

__ normalblendpage_

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

Inputs
++++++

The **Normal Blend** node accepts three inputs:

* The first input is the top layer.

* The second input is the bottom layer.

* The third input is an optional mask that will be multiplied with the opacity parameter.

Outputs
+++++++

The **Normal Blend** node outputs the result of the blend operation.

Parameters
++++++++++

The **Normal Blend** node has a single parameter:

* The *opacity* used when mixing the result of the blend operation with the bottom input
  when the corresponding input is not connected. When connected, the opacity channel is
  multiplied with that parameter.

Notes
+++++

The *opacity* input will be considered (and implicitly converted to) greyscale if it is a color texture.

Example images
++++++++++++++

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