About Utilizing Default Layers in Drawings
You can automatically place specific drawing item types on a layer by defining a default layer. You can use the def_layer configuration option to define which drawing item type to automatically place on a layer. When you create or show a drawing item type, it is simultaneously placed on the layer.
For example, if you use the layer_dim_<layer name> configuration option and create or show a dimension, it is automatically placed on the designated layer. You can either define a default layer that contains only one drawing item type, such as dimensions, or you can place all drawing item types on a particular layer.
You can also activate a layer to control the placement of drawing items on that layer. Though multiple layers can exist in a drawing, only one layer is active at a time.
You must manually activate and deactivate an existing or a created layer.
A default layer is activated automatically if you create it using the def_layer configuration option. Otherwise, you must manually activate it. If you manually create the layer ( > ), you must manually activate it.
If a drawing has one model or multiple models, drawing item types are placed on the layer for the reference model. For example, if you create a geometric tolerance in a drawing that uses a part as its model reference, the geometric tolerance is stored in the active layer of the part.
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• Items shown for the first time are added to the active layer. However, if a shown item was previously erased or removed from the layer, it is not added to the layer.
• You cannot activate ruled layers.
• You can use default layer models to generate ruled layers in parts the same way the def_layer configuration option works. This allows more complex ruled layers to be automatically created in models when needed.
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