Grouping of Materials for User-Defined Material Libraries
When creating materials for a user-defined material library, you can add Group nodes to create folders in the material library or to define a phase or a phase and orientation in the Material Library Settings section.
This structure will appear in the Material Browser window as folders and materials with a selection of phase or orientation/variation when you have saved the materials with their settings and group structure as an MPH-file and then imported that file as a user-defined material library.
When you add grouping for the phase and for an orientation or variation, use the Label in the Group node for the name of the material, such as Material name. For any subgroups or Material nodes for the phase, use Material name [Phase] as the Label for those nodes. For Material nodes under those phase groups, use Material name [Phase, Orientation/variation] as the Label to make the material appear with those phase and orientation or variation names (in brackets) as options in the Phase and Orientation/variation lists in the Material Browser.
Material Library Settings
Select the Material Library Settings checkbox in the Show More Options dialog to display this section for material under Global Definitions.
From the Group type list, choose one of the following options:
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 Library folder (the default), to use the Group node’s label as a library folder for organizing the material library into groups of material.
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Phase, to use the group for defining variations of a material with different material phases and possibly also orientation or variation. You define those properties in the Material subnodes’ Material Library Settings sections.
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 Phase and orientation, to use the group for materials with a certain phase and different orientation or variation. You define the orientation or variation in the Material subnodes’ Material Library Settings sections. From the Phase list, choose Custom, Solid, Liquid, or Gas to define the phase of the materials in this group.