Material Graph
The Material Graph facilitates advanced material editing/creation.
You can access the Material Graph from the Material Tab in the Project window. Click the 
Material Graph button to launch the Material Graph. It opens in a separate window and displays materials, textures, labels and more as nodes in a graph view to visualize connections and relationships within complex materials.
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Advanced Materials
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If you want to tweak an advanced material, you can access the parameters of various nodes via the |
Material View option in the bottom of the Material Panel. When this i active the list of in-project materials will be replaced by a tree-view showing the nodes that make up the current material.