When defining hatch boundaries by specifying internal points, the command detects the entities that form the boundary. In this case, additional options allow you to control the automatic detection of boundaries.
You can do the following:
Optionally, use the Origin and Transparency options to better display hatched entities.
To detect or ignore internal closed boundaries:
. Creates hatch patterns only in the outermost areas.
. Creates hatch pattern between alternate areas, starting with the outermost area (default).
. Ignores the internal structure and hatches the entire area. Hatch lines pass through text, block attributes, and 2D solids.The following diagram illustrates the In/Out, Out, and Ignore styles.

To set the hatch default origin:
To keep the boundary used when the hatch was created:
Optionally, you can maintain the initial closed contour normally deleted when a hatch is created.
On the Mode panel:
To specify a gap tolerance for hatching boundaries with gaps:
If there are gaps between the entities selected for a boundary definition, the command does not create the hatch. Red circles appear at endpoints near the gap and a message displays. However, you can define a gap tolerance so that, when creating the hatch, gaps equal to or smaller than the specified value are ignored. The command considers the boundaries closed and creates the hatch. If the gap is greater than the specified tolerance value, the message informs you that the hatch cannot be created.
You cannot select and manipulate the red circles. Use Rebuild or RebuildAll if you no longer need them displayed.

On the Additional Options panel:
In the Additional Options dialog box
Gaps equal to or smaller than the specified value are ignored.
Gaps equal to or smaller than the specified value are ignored and the hatch is created.
To specify the set of entities for the boundary detection:
- or -
To set the target Layer for subsequent hatches and fills:
On the Additional Options panel:
The setting is valid for the current drawing and stored in the drawing. <Active> is the default for new drawings, unless the template file for the drawing sets a specific Layer name.
To set the hatch line color:
On the Additional Options panel:
To set the hatch background color:
On the Additional Options panel:
To specify hatch or fill transparency level:
On the Additional Options panel:
Access
Command: Hatch
Menu: Draw > Hatch
Tool Palettes: Draw > Hatch