Rhino allows layer names to be repeated if the repeated layer names are sublayers of different layers in the layer tree, as shown in the example above. There are two sublayers named Walls and two sublayers named Doors. Each is a sublayer of a different layer, Floor 1 and Floor 2.
Some Rhino users requested this ability to have sublayers with the same layer name to help them organize layers to make it easier to find similar small features in a large model.
Other users have designed their work flows and parts libraries assuming that there are no duplicate layer names. If you are one of these users, the section below explains how you can configure Rhino so it will not create duplicate sublayers when importing models.
For some users, having more than one layer with the same name disrupts their workflow. So Rhino lets you control how layers are combined when Rhino imports an external model into an existing model.
Note There are many ways to import an external model into the existing model including:
The Rhino Options > Files tab in the Options command dialog offers two options for managing layer names.
Below is an example that shows what happens when you open a model named ThreeStooges.3dm that has empty layers named Curly, Larry, and Moe and then import geometry from models named Curly Howard.3dm, Larry Fine.3dm and Moe Howard.3dm, which respectively contain layers named Curly, Larry, and Moe.
You may download the files used in this example from stoogesimportexample.zip.
Rhino has full support for linked block definitions. A linked block definition references an external file. Every time a model containing a linked block definition is loaded, Rhino also reads the referenced file to create the contents of the linked block definition. When you create a linked block definition (or edit its properties using the BlockManager command) you can specify one of these linked block definition layer styles:
You may download the files used in this example from producelinkedblockexample.zip.
This example demonstrates the two ways Rhino manages layer names for the contents of a linked block definition.
The model called ProduceDepartment.3dm has four linked blocks that reference files called Apple.3dm, Banana.3dm, Squash.3dm, and Carrot.3dm.