# Shader Graph Nodes

The High Definition Render Pipeline (HDRP) includes additional [Nodes](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?subfolder=/manual/Node.html) for Shader Graph. These Nodes allow you to use HDRP-specific features, such as sampling a [Diffusion Profile](Diffusion-Profile.md) for use within a Shader Graph that supports [subsurface scattering](Subsurface-Scattering.md). For information on the Nodes HDRP adds, see the following list of Node documentation links:

* [Diffusion Profile](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Diffusion-Profile-Node.html)
* [Emission](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Emission-Node.html)
* [Exposure](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Exposure-Node.html)
* [HD Scene Color](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/HD-Scene-Color-Node.html)
* Eye Shader Graph utilities
  * [CirclePupilAnimation](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Circle-Pupil-Animation-Node.html)
  * [CorneaRefraction](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Cornea-Refraction-Node.html)
  * [EyeSurfaceTypeDebug](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Eye-Surface-Type-Debug-Node.html)
  * [IrisLimbalRing](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Iris-Limbal-Ring-Node.html)
  * [IrisOffset](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Iris-Offset-Node.html)
  * [IrisOutOfBoundColorClamp](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Iris-Out-Of-Bound-Color-Clamp-Node.html)
  * [IrisUVLocation](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Iris-UV-Location-Node.html)
  * [ScleraIrisBlend](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Sclera-Iris-Blend-Node.html)
  * [ScleraLimbalRing](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Sclera-Limbal-Ring-Node.html)
  * [ScleraUVLocation](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?preview=1&subfolder=/manual/Sclera-UV-Location-Node.html)