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Blocks and Block Libraries
Libraries of block content for detail components should be created and stored
according to the following guidelines, each of which is discussed in more
detail subsequently.
â– Block content should be drawn with the current style of geometry. (See
Using Optimal Geometry on page 3957.)
â– Blocks should have namespace prefixes. (See Naming Blocks on page 3959.)
â– Base points for inserting blocks should be positioned logically. (See Base
Points for Blocks on page 3959.)
â– Similar blocks should be stored in the same DWG file. (See Collecting
Similar Blocks on page 3959.)
â– Properties of block entities should be set to ByBlock. (See Block Properties
on page 3960.)
â– All unnecessary objects should be removed from block library drawings.
(See Removing Unnecessary Objects on page 3961.)
Using Optimal Geometry
Many block libraries that were created in legacy versions of AutoCAD contain
geometry that is non-optimal in that it can result in performance problems,
incorrect snap points, or tolerance discrepancies that cause errors when Aec
Modify tools or other AutoCAD editing commands are used. You should avoid
using this old-style geometry when creating new blocks, and you should
remove or replace it whenever you encounter it in existing block content.
The following sections describe five main areas in which you should strive to
use optimal geometry.
Polylines
Prior to AutoCAD Release 14, the polyline entity consisted of multiple vertex
entities and was not stored in a compact form. You can identify these old-style
polylines by running the LIST command, which identifies them as type
POLYLINE. Any such entities should be recreated as new-style polylines by
tracing over them manually with the Polyline tool. The LIST command
identifies new-style polylines as LWPOLYLINE.
Blocks and Block Libraries | 3957
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