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Endpoint, and Midpoint object snap modes, and then adjust the geometry
using its grip points.
Naming Blocks
The names of blocks containing detail component content should have a
namespace prefix to avoid conflicts with other blocks. For example, all blocks
in libraries provided with AutoCAD Architecture use “AecDtl_” as the
namespace prefix. If you are creating your own blocks, you should use a unique
prefix.
Base Points for Blocks
Each block should have a base point that is logically positioned for inserting
the block in relation to other geometry in a drawing; that is, the base point
location should allow the user to insert the block using an object snap on
some other piece of geometry as an insertion point. If possible, the base point
location should also facilitate repeated placement of the item. For example,
a block representing a paver should not have the base point in the middle of
the block, because you would not likely want the middle of the block inserted
at any object snap on existing geometry. Likewise, a base point in the upper-left
corner only makes sense if the item is to be placed under some other geometry.
However, if the base point is at the lower-left corner, the user can snap to the
ground plane, and repeated insertions are easy.
Collecting Similar Blocks
Similar or closely related block definitions should be collected in a single DWG
file. For example, in the details block library supplied with AutoCAD
Architecture, the block definitions for all the different sizes of nails are collected
in a block library drawing file called AecDtlLib_Nails.dwg, and all block
definitions detailing carpet accessories are in a file called
AecDtlLib_CarpetAcc.dwg. As shown below, for each block definition, the drawing
should include a block reference inserted on a horizontal line to show how
the block’s base point is used to position the block in relation to other
Naming Blocks | 3959
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