Content type browser - Materials
Start from scratch
Create a new material based on one of the default material types.
                                             Import From File...
Import From File...
                                        Import a Rhino material (*.rmtl) on the disk.
                                             Custom
Custom
                                        Create a new custom material.
Start from existing
Select an existing material as the template to start a new material.
                                             Make a copy
Make a copy
                                        Create a standalone material from the selected material.
                                             Share all settings
Share all settings
                                        Create a material instance from the selected material. The settings in the two materials are linked.
                                             Show tree view
Show tree view
                                        Display the tree structure of the existing render content items on the left.