Layer command
Layers are the equivalent of the overlays used in paper-based drafting. Layers are the primary organizational tool in AutoCAD®: you use them to group information by function and to enforce linetype, color, and other standards.
By creating layers, you can associate similar types of objects by assigning them to the same layer. For example, you can put construction lines, text, dimensions, and title blocks on separate layers. You can then control
Whether objects on a layer are visible in any viewports
Whether and how objects are plotted
What color is assigned to all objects on a layer
What default linetype and lineweight are assigned to all objects on a layer
Whether objects on a layer can be modified
Every drawing includes a layer named 0. Layer 0 cannot be deleted or renamed. It has two purposes:
Ensure that every drawing includes at least one layer
Provide a special layer that relates to controlling colors in blocks
Note It is recommended that you create several new layers with which to organize your drawing rather than create your entire drawing on layer 0.
(fr.autocad.help)
By creating layers, you can associate similar types of objects by assigning them to the same layer. For example, you can put construction lines, text, dimensions, and title blocks on separate layers. You can then control
Whether objects on a layer are visible in any viewports
Whether and how objects are plotted
What color is assigned to all objects on a layer
What default linetype and lineweight are assigned to all objects on a layer
Whether objects on a layer can be modified
Every drawing includes a layer named 0. Layer 0 cannot be deleted or renamed. It has two purposes:
Ensure that every drawing includes at least one layer
Provide a special layer that relates to controlling colors in blocks
Note It is recommended that you create several new layers with which to organize your drawing rather than create your entire drawing on layer 0.
(fr.autocad.help)
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