Linking materials and node groups

Similar to Blender Internal, Cycles materials can be linked from libraries. Every blend file containing linkable assets can be a library.

Linking materials is really useful practice. Let's say you have 20 different blend files with objects using an iron shader, and at a certain point of your workflow, you need to modify this iron material in all the files. By having this material linked in all the 20 files from a single blend, it is possible to update all of them at once by modifying just one shader in the library file (as you know, a linked material reflects the properties of the library material and cannot be edited, differently from an appended material that is local to the file where it has been imported from ...

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