Autodesk 00128-051462-9310 User Guide - Page 453

■ Multiple listings of the same layer must always have identical property settings. For example, a layer that is a member of two groups cannot be a different color in each group. ■ You cannot list a layer twice in a group. ■ You can delete layer groups without affecting the layers in the group. ■ Changing one of the properties of a layer group changes that property for all the layers in that group, except where the change would be invalid. For example, it is not possible to freeze the current layer. ■ Layer group names need not be unique. ■ There is no naming convention for layer groups. Group names can include spaces, non-alphanumeric characters, and both uppercase and lowercase letters. ■ Xref layer groups cannot contain other filter groups. Managing Layer Groups You can add and subtract layers from layer groups. You can change the standard AutoCAD properties for the layers in groups, rename layer groups, delete layer groups, and change the filters in filter groups. Types of Layer Filters With the Layer Manager, you can create three types of layer filters: group filters, property filters, and layer standards filters. Group filters can contain any layers in the current drawing. You can manually add layers to, and remove layers from, group filters by dragging layers within the Layer Manager into the group filter or by selecting an object in the drawing on the layer that you want to add to the group filter. Group filters are considered static because they are not automatically updated. They include only the layers that were assigned when the group was created. You can manually add layers to, and remove layers from, group filters. Property filters contain layers that meet filter criteria that you specify for the group. Filter criteria can select layers according to layer states (on/off, frozen/thawed, locked/unlocked), properties, or names. For example, you can create a property filter that includes all of the red layers in the current drawing. Property groups are considered dynamic because they are automatically updated when you change the properties of layers that are part of the group. Property filters are also updated when you add or modify layers that meet the criteria specified in the filter. You cannot manually add layers to, or remove layers from property filters. The layer groups named Xrefs and All are created automatically. Creating a Group Filter Use this procedure to create a group filter. Group filters can contain any layers currently listed in the Layer Manager. You can manually add layers to, and remove layers from, group filters by dragging layers within the Layer Manager into the group filter or by selecting an object in the drawing on the layer that you want to add to the group filter. 1 Click Format menu ➤ Layer Management ➤ Layer Manager. 2 In the left pane of the Layer Manager, select a layer group that you want to create the new group under, right-click, and select New Group Filter, or click in the Layer Manager. 3 Enter a name for the new group filter, and press ENTER. 4 Edit the new group filter: If you want to... add layers to the group filter Then... see "Adding Layers to Layer Groups" on page 417. specify properties for the group filter see "Changing the Properties of a Layer Group" on page 417. 5 Click OK. Types of Layer Filters | 413