/*!
\page usdShaders_page_front UsdShaders :  Definitions and Implementations of Usd* Shader Nodes
\if ( PIXAR_MFB_BUILD )
\mainpage UsdShaders : Definitions and Implementations of Usd* Shader Nodes
\publicLib
\endif

\section usdShaders_overview Overview
This library houses the definitions and implementations for all the current 
(and future) "Usd*" shader nodes, eg. UsdPreviewSurface, UsdUVTexture etc.

The definitions are represented by a UsdShade-based shader definition file. 
See \ref UsdShadeShaderDefinition. It currently only contains "glslfx" 
implementations for the hydra GL backend. In the (not-too-distant) future, it 
will contain "oso" files that provide OSL implementations of the Usd* shaders.

In addition to shader definitions and implementations, this library may also 
provide Usd schemas for robust authoring and querying of shader properties in
the future.

*/