Transcript External_References.ppt

External References
Chapter 24
Sacramento City College
EDT 310
EDT 310 - Chapter 24 - External References
1
Objectives
 Define
the function of external
references.
 Reference an existing drawing into the
current drawing using the XREF
command.
 Bind external references and selected
dependent objects to a drawing.
 Edit external references in the current
drawing.
EDT 310 - Chapter 24 - External References
2
Objectives
 Use
external references to create a
multi-view layout.
 Control
the display of layers in
viewports using the Layer Properties
Manager.
EDT 310 - Chapter 24 - External References
3
The XREF Command
EDT 310 - Chapter 24 - External References
4
The XREF Command
A
design firm has a team of designers.
 Architect.
 Mechanical.
 Electrical.
 Civil.
 Structural.
 Landscape.
EDT 310 - Chapter 24 - External References
5
The XREF Command
 Each
member of the team must have
access to the building information and
drawings that are prepared by the
architect.
 Building
floor plan
 Site plan.
 Etc.
EDT 310 - Chapter 24 - External References
6
The XREF Command
 The
team could share information like
this:
 Architect
prepares work.
 Architect WBLOCKS information to FIVE
diskettes and distributes the diskettes to the
project team.
 Each team member would have a copy of the
architect’s work and could INSERT the
information into their own drawing files.
EDT 310 - Chapter 24 - External References
7
Original Distribution
Electrical
Mechanical
Architect
Landscape
Structural
EDT 310 - Chapter 24 - External References
Civil
8
The XREF Command
 Everyone
is happy.
 Each has a copy of the architect’s work.
EDT 310 - Chapter 24 - External References
9
The XREF Command
 The
architect then goes to a progress
meeting with the client.
 The
client wants many changes made to
the building floor plan.
 The
architect complies and makes
changes to his drawing.
EDT 310 - Chapter 24 - External References
10
The XREF Command
 The
architect then changes the shape
of the floor plan, because project
requirements change.
EDT 310 - Chapter 24 - External References
11
The XREF Command
 BUT,
to give the changes to the team,
the entire process must be repeated.
 WBLOCK
floor plan to diskette.
 Distribute diskette to team members.
 Team members delete old BLOCKS
 Team members INSERT new revised
BLOCKS.
EDT 310 - Chapter 24 - External References
12
Revised Distribution #1
Electrical
Mechanical
Architect
Landscape
Structural
EDT 310 - Chapter 24 - External References
Civil
13
The XREF Command
 Everyone
is once again happy.
 They
work on their plans using WBLOCK
copies of the architect’s work.
 However…
EDT 310 - Chapter 24 - External References
14
The XREF Command
 The
architect once again, goes to a
progress meeting with the client.
 Again,
client.
 So…
changes are requested by the
EDT 310 - Chapter 24 - External References
15
The XREF Command
A
week later, the architect AGAIN
changes the shape of the floor plan.
 The entire process must be repeated a
THIRD TIME (!)
 WBLOCK
to diskette.
 Distribute diskette to team members.
 Team members delete old BLOCKS
 Team members INSERT new revised
BLOCKS.
EDT 310 - Chapter 24 - External References
16
Revised Distribution #2
Electrical
Mechanical
Architect
Landscape
Structural
EDT 310 - Chapter 24 - External References
Civil
17
The XREF Command
 Clearly,
an easier method must be found
to distribute information to team
members.
 The
XREF ability of AutoCAD is the
“easier” method.
EDT 310 - Chapter 24 - External References
18
The XREF Command
 You
can reference, one or more existing
drawings into the current drawing
without adding them to the contents of
the current file.
EDT 310 - Chapter 24 - External References
19
The XREF Command
 XREFs
are not added to the current
drawing.
 The
drawing is just displayed on screen.
 The architect’s MOST CURRENT version can
be displayed on EVERYONE’s screen !
 This
makes for
 Much
smaller files.
 Increased accuracy (information is latest).
EDT 310 - Chapter 24 - External References
20
The XREF Command
 The
XREF is “linked” or “attached” to
your master file.
 The
linked information is NOT part of
your drawing.
 You
just see the information as a
“picture” or “link”.
EDT 310 - Chapter 24 - External References
21
The XREF Command
 Several
people can reference the same
drawing file.
 Mechanical
engineer
 Electrical engineer
 Civil engineer.
 Any
revisions to the referenced drawing
will be displayed in any drawing where it
is used.
EDT 310 - Chapter 24 - External References
22
The XREF Command
 Think
of an XREF as just a “picture”
being displayed behind your current
drawing.
EDT 310 - Chapter 24 - External References
23
Original Distribution
Master
Mechanical file for
Mechanical
Electrical
Master
file for
Electrical
Architect
Master
Landscape
file for
Landscape
Structural
The XREF’d
Architectural file
Civil
Master
EDT 310 - Chapter 24 - External References
file for Structural
Master
file for
Civil
24
Revised Distribution #1
Master
Mechanical file for
Mechanical
Electrical
Master
file for
Electrical
Architect
Master
Landscape
file for
Landscape
The XREF’d
Architectural file
Structural
Master
file for
EDT 310 - Chapter 24 - External References
Structural
Civil
Master
file for
Civil
25
Revised Distribution #2
Master
Mechanical file for
Mechanical
Electrical
Master
file for
Electrical
Architect
Master
Landscape
file for
Landscape
Structural
Master
file for
EDT 310 - Chapter 24 - External References
Structural
The XREF’d
Architectural file
Civil
Master
file for
Civil
26
Benefits of External References
EDT 310 - Chapter 24 - External References
27
Benefits of External References
 The
“Master Drawing” is the drawing to
which that you have attached XREF
files.
 The
“Master Drawing” is YOUR drawing.
 The “XREF Drawing is your teammate’s dwg.
 Remember
YOU are the MASTER of your
own fate. (Master drawing belongs to you).
EDT 310 - Chapter 24 - External References
28
Benefits of External References
 1.
Whenever the Master Drawing is
opened, the latest versions of the
attached XREF’ed files are displayed.
 You
see your teammate’s latest revisions.
EDT 310 - Chapter 24 - External References
29
Benefits of External References
 2.
XREF’s are automatically updated
 AutoCAD
reloads each XREF whenever the
Master Drawing is loaded.
 AutoCAD updates each XREF before plotting
the Master Drawing.
EDT 310 - Chapter 24 - External References
30
Benefits of External References
 3.
You can also “Force an XREF update”
at any time.
 Architect
makes changes.
 Calls teammates
 Teammates do a RELOAD of the XREF file.
 Teammates see the latest changes !
EDT 310 - Chapter 24 - External References
31
Benefits of External References
 4.
XREFS can be nested.
 “A picture
inside a picture.”
Master File
1
EDT 310 - Chapter 24 - External References
32
Benefits of External References
 5.
You can use as many XREFS as
needed for any drawing.
 A detail
referenced to the Master Drawing can
be composed of smaller details that are
themselves XREFS.
Detail Library on File Server
Detail 1
EDT 310 - Chapter 24 - External References
3
2
1
Master
Drawing
File
33
Benefits of External References
 5.
You can use as many XREFS as
needed for any drawing.
 ONE
CORRECT copy is stored on the server.
 Avoids duplication of details that could be
wrong.
Detail Library on File Server
Detail 1
EDT 310 - Chapter 24 - External References
3
2
1
Master
Drawing
File
34
Benefits of External References
 6.
Multiple XREFS can be attached to
your drawing.
Civil Sheet
Architectural Sheet
Master
3
21
Drawing
File
Mechanical Sheet
EDT 310 - Chapter 24 - External References
35
Benefits of External References
 All
referenced drawings can be set to
update automatically when your master
drawing when it is opened.
EDT 310 - Chapter 24 - External References
36
The XREF Command
EDT 310 - Chapter 24 - External References
37
The XREF Command
 To
access the XREF command:
 Pick
the External Reference button from
either the Reference or Insert toolbar
EDT 310 - Chapter 24 - External References
38
The XREF Command
 To
access the XREF command:
 Pick
Xref Manager... from the Insert pull-down
menu
EDT 310 - Chapter 24 - External References
39
EDT 310 - Chapter 24 - External References
40
The XREF Command
 To
access the XREF command:
 Enter
 This
box.
XREF or XR at the Command: prompt.
displays the Xref Manager dialog
EDT 310 - Chapter 24 - External References
41
EDT 310 - Chapter 24 - External References
42
Attaching an External Reference to
the Current Drawing
EDT 310 - Chapter 24 - External References
43
Attaching an External Reference
 The
XREF command functions very
similar to the INSERT command.
A
Referenced Drawing that is “XREF’d”
into the current drawing is said to be
“attached”.
EDT 310 - Chapter 24 - External References
44
Attaching an External Reference
 Enter
the XREF command from
 The
INSERT pull-down menu.
 Typing “XREF” or “XR” at the Command:
prompt.
 Selecting the “External Reference” button on
the INSERT toolbar.
EDT 310 - Chapter 24 - External References
45
Attaching an External Reference
 To
attach the reference to the current
drawing,
 Enter
the XREF command
EDT 310 - Chapter 24 - External References
46
Attaching an External Reference
 Pick
the Attach... button in the Xref
Manager dialog box.
EDT 310 - Chapter 24 - External References
47
Attaching an External Reference
 The
Select Reference File dialog box is
displayed.
EDT 310 - Chapter 24 - External References
48
Attaching an External Reference
 Select
the desired drawing file to
attach.
 Pick Open.
EDT 310 - Chapter 24 - External References
49
Attaching an External Reference
 XREF
screen is similar to INSERT.
EDT 310 - Chapter 24 - External References
50
Attaching an External Reference
 XREF
screen differences to INSERT.
EDT 310 - Chapter 24 - External References
51
Attaching an External Reference
 The
External Reference dialog box is
displayed
EDT 310 - Chapter 24 - External References
52
Attaching an External Reference
 This
dialog box is used to indicate how
and where the reference is to be placed
in the current drawing.
EDT 310 - Chapter 24 - External References
53
Attaching an External Reference
 The
name and path of the currently
selected XREF are shown in the upperleft comer of the dialog box.
 Use Browse... to change the drawing to
be attached
EDT 310 - Chapter 24 - External References
54
Attaching an External Reference
 Set
the insertion point, scaling, and
rotation angle.
EDT 310 - Chapter 24 - External References
55
Attaching an External Reference
 Click
the “Retain Path” check box.
 This saves the file path with the
Master Drawing.
EDT 310 - Chapter 24 - External References
56
File Locations of External
References
EDT 310 - Chapter 24 - External References
57
Attaching an External Reference
 When
the path is not included, AutoCAD
searches
 Support
File Search Path
 Project Files Search Path
EDT 310 - Chapter 24 - External References
58
Attaching an External Reference
 Specify
the Support File Search Path in
the Files tab of the Options dialog box.
EDT 310 - Chapter 24 - External References
59
Project Files Search Path
 AutoCAD
searches for XREF files in all
paths of the current project name.
EDT 310 - Chapter 24 - External References
60
Project Files Search Path
 Project
Files Search Path are listed in
the Files Options dialog box.
EDT 310 - Chapter 24 - External References
61
Project Files Search Path
 Create
a new project as follows:
 1.
Pick Project Files Search Path to highlight
it, and then pick the Add... button.
 2. Enter a project name if desired.
 3. Pick the plus sign icon (+), and then pick
the word “Empty”.
 4. Pick the Browse... button and locate the
folder that is to become part of the project
search path.
 5. Pick OK.
EDT 310 - Chapter 24 - External References
62
EDT 310 - Chapter 24 - External References
63
EDT 310 - Chapter 24 - External References
64
EDT 310 - Chapter 24 - External References
65
EDT 310 - Chapter 24 - External References
66
EDT 310 - Chapter 24 - External References
67
XREF’s Compared with INSERT
EDT 310 - Chapter 24 - External References
68
XREF’s vs Insert
 XREF’s
are similar to INSERT as far as
 Rotation.
 Insertion
Point.
 Scaling.
EDT 310 - Chapter 24 - External References
69
XREF’s vs Insert
 XREF
files are different from INSERT
 XREF’ed
 Are
files
NOT ADDED the current drawing file.
 INSERT’ed
 Are
files
ADDED to the current drawing file.
 XREF’s
 Can
be automatically updated.
 INSERT’ed
 CANNOT
be automatically updated.
EDT 310 - Chapter 24 - External References
70
XREF’s vs Insert
 XREF
files are different from INSERT
 XREF’s
 Show
the most current information.
 INSERT’ed
 May
NOT show the most current information.
 XREF’s
 ONE
COPY of the original exists.
 INSERT’ed
 MULTIPLE
copies of original file exist.
EDT 310 - Chapter 24 - External References
71
Overlaying the Current Drawing
with an External Reference
EDT 310 - Chapter 24 - External References
72
Overlaying With XREF
 Overlaying
 Allows
you to temporarily view the xref without
attaching it.
EDT 310 - Chapter 24 - External References
73
Overlaying With XREF
 To
overlay:
 Activate
the Overlay option button in the
External Reference dialog box after selecting
an XREF.
EDT 310 - Chapter 24 - External References
74
Nested XREF’s and Overlay
EDT 310 - Chapter 24 - External References
75
Overlaying vs Attaching XREF

Nested XREFs
 Are
handled differently between overlay and
attaching.


Nesting occurs when an externally referenced
file is referenced by an xref file that has
been attached to the current drawing.
Parent XREFs are XREF files that are
attached.
EDT 310 - Chapter 24 - External References
76
Overlaying vs Attaching XREF
 When
an XREF is overlaid,
 Nested
XREFS that it contains are displayed if
the XREFS were attached, but not if they
were overlaid.
 In
other words, any nested overlays are
not carried into the master drawing
with the parent xref.
EDT 310 - Chapter 24 - External References
77
Detaching, Reloading, Unloading
EDT 310 - Chapter 24 - External References
78
Detaching, Reloading, Unloading
 When
a Master Drawing is opened
 The
XREF is also loaded
 The XREF appears on screen.
 This
attachment remains permanent
until you remove or detach it.
EDT 310 - Chapter 24 - External References
79
Detaching, Reloading, Unloading
 To
remove or detach:
 Highlight
the reference name in the XREF
Manager dialog box.
 Pick the Detach button.
EDT 310 - Chapter 24 - External References
80
Detaching, Reloading, Unloading
 When
detached:
 All
instances of the XREF are erased.
 All referenced data is removed from the
current drawing.
 All XREFS nested within the detached file are
also removed.
EDT 310 - Chapter 24 - External References
81
Detaching, Reloading, Unloading
 The
actual detachment does not occur
until you press OK and close the dialog
box!
 This
is helpful if you accidentally detach
an xref,
 You can simply press Cancel to prevent
the detachment and return to the
drawing.
EDT 310 - Chapter 24 - External References
82
Detaching, Reloading, Unloading
 To
update or reload an xref file
 Highlight
the reference name in the Xref
Manager dialog box
 Pick the Reload button.
EDT 310 - Chapter 24 - External References
83
Detaching, Reloading, Unloading
 Reload
 Forces AutoCAD
to read and display the most
recently saved version of the XREF’ed
drawing.
EDT 310 - Chapter 24 - External References
84
Detaching, Reloading, Unloading
 Unload
 Is
a temporary removal of an XREF.
 The XREF is NOT actually detached.
EDT 310 - Chapter 24 - External References
85
Detaching, Reloading, Unloading
 Unload
 Highlight
the reference name
 Pick the Unload button.
EDT 310 - Chapter 24 - External References
86
Detaching, Reloading, Unloading
 When
an XREF is unloaded, it is not
 Displayed
or
 Regenerated.
 AutoCAD's
performance is increased.
EDT 310 - Chapter 24 - External References
87
Detaching, Reloading, Unloading
 To
display the XREF again:
 Access
the Xref Manager dialog box
 Pick the Reload button.
EDT 310 - Chapter 24 - External References
88
The Xref Manager Dialog Box
EDT 310 - Chapter 24 - External References
89
The Xref Manager Dialog Box
 Use
the Xref Manager dialog box to
access current information about any
referenced file in the Master drawing.
EDT 310 - Chapter 24 - External References
90
EDT 310 - Chapter 24 - External References
91
The Xref Manager Dialog Box
 File
names:
 Display
in list view or tree view.
 The list view display mode is the default.
EDT 310 - Chapter 24 - External References
92
The Xref Manager Dialog Box
 Reference
Name.
 This
column lists the names of all existing
external references.
EDT 310 - Chapter 24 - External References
93
The Xref Manager Dialog Box
 Status.
 This
column describes the current status of
each xref.
EDT 310 - Chapter 24 - External References
94
The Xref Manager Dialog Box
 The
XREF status:
 Loaded.
The xref is attached to the drawing.
 Unloaded. XREF not displayed or regenerated.
EDT 310 - Chapter 24 - External References
95
The Xref Manager Dialog Box
 The
XREF status:
 Unreferenced.
The XREF has nested XREFS
that are not found or are unresolved.
 An unreferenced XREF is not displayed.
 Not Found. The xref file was not found in valid
search paths.
 Unresolved. The xref file is missing or cannot
be found.
EDT 310 - Chapter 24 - External References
96
The Xref Manager Dialog Box
 Orphaned.
The parent of the nested xref was
unloaded or cannot be found.
 Reload. The XREF is marked to be reloaded.
 Loading and unloading both occur after the
dialog box is closed.
 Unload. The XREF is marked to be unloaded.
EDT 310 - Chapter 24 - External References
97
The Xref Manager Dialog Box
 Size.
 The
file size for each XREF is listed in this
column.
EDT 310 - Chapter 24 - External References
98
The Xref Manager Dialog Box
 Type.
 This
column indicates whether the XREF was
attached or referenced as an overlay.
EDT 310 - Chapter 24 - External References
99
The Xref Manager Dialog Box
 Date.
 The
last modification date for the file being
referenced is indicated in this column.
EDT 310 - Chapter 24 - External References
100
The Xref Manager Dialog Box
 Saved
Path.
 Lists
the path name saved with the XREF.
 If only a file name appears here, the path has
not been saved.
EDT 310 - Chapter 24 - External References
101
The Xref Manager Dialog Box
 The
column widths can be adjusted.
 To
show a listing of externally
referenced files that shows nesting
levels:
 Pick
the Tree View button
 OR
 Press
the [F4] key.
EDT 310 - Chapter 24 - External References
102
EDT 310 - Chapter 24 - External References
103
The Xref Manager Dialog Box
 In
the tree view display mode:
 The
drawing is indicated with the standard
AutoCAD 2000 drawing file icon.
 XREFS appear as a sheet of paper with a
paper clip.
EDT 310 - Chapter 24 - External References
104
Tree View Display Mode
 In
the tree view display mode:
 Nesting
levels are shown in a format that is
similar to the arrangement of folders.
EDT 310 - Chapter 24 - External References
105
Tree View Display Mode
 The
XREF icon can take on different
appearances, depending on the current
status of the xref.
EDT 310 - Chapter 24 - External References
106
XREF icon
 Unloaded
= is grayed out.
EDT 310 - Chapter 24 - External References
107
XREF icon
 A question
mark = the file was not found.
EDT 310 - Chapter 24 - External References
108
XREF icon
 An
upward arrow = the xref has just been
reloaded
EDT 310 - Chapter 24 - External References
109
XREF icon
 A downward
arrow = the xref has just been
unloaded.
EDT 310 - Chapter 24 - External References
110
Updating the XREF Path
EDT 310 - Chapter 24 - External References
111
Updating the XREF Path
 If
an XREF file is not found in the
Saved Path location when the master
drawing is opened, AutoCAD searches
 The
library path.
 The current drawing folder.
 The Support File Search Path locations set in
the Files tab of the Options dialog box.
EDT 310 - Chapter 24 - External References
112
Updating the XREF Path
EDT 310 - Chapter 24 - External References
113
Updating the XREF Path
 To
update the Saved Path location, pick
the Save Path button.
EDT 310 - Chapter 24 - External References
114
Updating the XREF Path
 When
a referenced drawing cannot be
found, AutoCAD lists its status is
indicated as Not Found.
EDT 310 - Chapter 24 - External References
115
Updating the XREF Path
 Update
the path to refer to the new
location of the XREF by:
 Selecting
the Browse... button in the Xref
Found At area.
EDT 310 - Chapter 24 - External References
116
EDT 310 - Chapter 24 - External References
117
Updating the XREF Path
 Go
to the new folder
 Select the desired file.
EDT 310 - Chapter 24 - External References
118
Updating the XREF Path
 Press
Open to update the path.
EDT 310 - Chapter 24 - External References
119
Updating the Xref Path
 Pick
OK.
 The
XREF is automatically re-loaded into the
drawing.
EDT 310 - Chapter 24 - External References
120
Binding an External Reference
EDT 310 - Chapter 24 - External References
121
Binding an External Reference
 An
externally referenced file can be
made a permanent part of the Master
Drawing.
 The
result is the same as if it had been
inserted with the INSERT command.
 This
is called binding an XREF.
EDT 310 - Chapter 24 - External References
122
Binding an External Reference
 Use
binding when you need to send the
full drawing file on disk to a plotting
service, or to a client.
 BINDING
an XREF = INSERT
EDT 310 - Chapter 24 - External References
123
Binding an External Reference
 When
an XREF is bound,
 Objects
are renamed
 Blocks
 Dimension
styles
 Layers
 Linetypes
 Text
styles
 By AutoCAD.
EDT 310 - Chapter 24 - External References
124
Binding an External Reference
 When
an XREF is attached,
 Dependent
objects in the XREF are renamed.
 XREF name precedes the actual object name.
 The names are separated by a vertical bar
symbol (|).
EDT 310 - Chapter 24 - External References
125
Binding an External Reference
 Example:
 File
named TITLE has layer named NOTES.
NOTES
TITLE
EDT 310 - Chapter 24 - External References
126
Binding an External Reference
 When
attached as an XREF
 Title
comes into the Master Drawing as
 Title l Notes.
Master Drawing
TITLE|NOTES
TITLE
EDT 310 - Chapter 24 - External References
127
Binding an External Reference
 The
vertical bar distinguishes the
 XREF-dependent
layer name from the
 Same layer name in the Master drawing.
 Master
Drawing Layer List would be:
 Notes
 TITLE|NOTES
EDT 310 - Chapter 24 - External References
128
Binding an External Reference
 When
an XREF file is bound,
 The
dependent objects are renamed AGAIN
 This shows that they have become a
permanent part of the drawing.
 There
are different renaming methods,
depending on the type of binding that is
performed.
EDT 310 - Chapter 24 - External References
129
Binding an External Reference
 To
bind an XREF using the Xref
Manager dialog box:
 Highlight
the XREF to bind
 Select the Bind... button.
 The Bind Xrefs dialog box is displayed.
EDT 310 - Chapter 24 - External References
130
Binding an External Reference
 The
Insert option brings the XREF into
the drawing as if you had used the
INSERT command.
 All
instances of the XREF are converted to
normal block objects.
 The
drawing is entered into the block
definition table.
EDT 310 - Chapter 24 - External References
131
Binding an External Reference
 All
named objects such as
 Layers
 Blocks,
and
 Styles
 are
incorporated into the Master
drawing as named in the XREF.
EDT 310 - Chapter 24 - External References
132
Binding an External Reference
 Example
 An
XREF named PLATE is bound
 It
contains a layer named OBJECT
 The xref-dependent layer PLATE | OBJECT
becomes the locally defined layer OBJECT.
 All other XREF-dependent objects are
stripped of the XREF name.
 They assume the properties of the locally
defined objects with the same name.
EDT 310 - Chapter 24 - External References
133
Binding an External Reference
 The
Insert binding option
 Provides
the best results for most purposes
 The
Insert binding option is commonly
used
 When
you need to send the ENTIRE file to a
client or plotting service.
EDT 310 - Chapter 24 - External References
134
Binding an External Reference
 The
Bind option
 Brings
the XREF in as a native part of the
Master drawing.
 Converts all instances of the XREF to blocks.
 The XREF name is kept with the names of all
dependent objects.
 The vertical line in each of the names is
replaced with two dollar signs with a number
in between.
EDT 310 - Chapter 24 - External References
135
Binding an External Reference
 Example:
 A layer
named Title l Notes is renamed to
Title$0$Notes when the xref is bound using
the Bind option.
 The
number inside the dollar signs is
automatically incremented if a local object
definition with the same name exists.
EDT 310 - Chapter 24 - External References
136
Binding an External Reference
 If
Title$O$Notes already exists in the
drawing.
 The layer is renamed to:
 Title $ 1 $ Notes.
 Unique names are created for all xrefdependent object definitions that are
bound.
 Rename objects as desired using the
RENAME command.
EDT 310 - Chapter 24 - External References
137
Clipping an External Reference
EDT 310 - Chapter 24 - External References
138
Clipping an External Reference
 Frequently,
you need to display only a
specific portion of an XREF.
 AutoCAD
allows you to create a
boundary that displays a subregion of an
external reference.
EDT 310 - Chapter 24 - External References
139
Clipping an External Reference
 When
clipped
 All
geometry occurring outside the boundary
is invisible.
 Objects that are partially within the subregion
appear to be trimmed at the boundary.
 Although
these objects appear trimmed, the
referenced file is not changed in any way.
EDT 310 - Chapter 24 - External References
140
Clipping an External Reference
 Clipping
is applied to selected instances
of an xref, and not to the actual xref
definition.
EDT 310 - Chapter 24 - External References
141
The XCLIP Command
EDT 310 - Chapter 24 - External References
142
The XCLIP Command
 Use
 To
XCLIP command
create and modify clipping boundaries.
 Access
the XCLIP command by:
 Pick
the External Reference Clip button from
the Reference toolbar
 OR
 Pick
Xref from the Clip cascading menu in the
Modify pull-down menu
 OR
 Enter
XC or XCLIP at the Command: prompt.
EDT 310 - Chapter 24 - External References
143
The XCLIP Command
 Command:
XC or XCLIP
 Select objects: (select any number of xref
objects)
 Select objects:
 Enter clipping option
 [ON/OFF/Clipdepth/Delete/generate
Polyline/New boundary] <New>:
EDT 310 - Chapter 24 - External References
144
The XCLIP Command
 Select
as many objects as required at
the “Select objects:” prompt
 The
New boundary option is the default.
 New
boundary allows you to select the
clipping boundary.
EDT 310 - Chapter 24 - External References
145
The XCLIP Command
 Other
options of the XCLIP command:
 *ON
and OFF.
 *Clipdepth.
 *Delete.
 *generate Polyline.
EDT 310 - Chapter 24 - External References
146
The XCLIP Command
 *ON
and OFF.
 The
clipping feature can be turned on or off as
needed by using these options.
 *Clipdepth.
 This
option allows a front and back clipping
plane to be defined.
 The front and back clipping planes define
what portion of a 3D drawing is displayed.
EDT 310 - Chapter 24 - External References
147
The XCLIP Command
 **Delete.
 Use
to remove a clipping boundary
completely, use this option.
 *Generate
Polyline.
 Use
to create a polyline object to represent
the clipping border of the selected xref.
EDT 310 - Chapter 24 - External References
148
The XCLIP Command
 After
the New boundary option is
selected, the XCLIP command sequence
continues as follows:
 Specify
clipping boundary:
 [Select polyline/Polygonal/Rectangularl
<Rectangular>: (press [Enter] to create a
rectangular boundary)
 Specify first corner: (pick the first corner)
 Specify opposite corner: (pick the other
corner)
EDT 310 - Chapter 24 - External References
149
The XCLIP Command
 The
geometry outside of the clipping
boundary is no longer displayed after
the command is completed.
EDT 310 - Chapter 24 - External References
150
The XCLIP Command
A
clipped xref
 Can
be edited just like an unclipped xref.
 The
clipping boundary moves with the
xref.
 Nested
xrefs are clipped according to
the clipping boundary for the parent
xref.
EDT 310 - Chapter 24 - External References
151
The XCLIP Command
 Two
other options for defining a
boundary.
 Select
polyline.
 Polygonal.
EDT 310 - Chapter 24 - External References
152
The XCLIP Command
 Select
polyline.
 This
option allows you to select an existing
polyline object as a boundary definition.
 The border is composed only of straight line
segments
 Any arc segments in the selected polyline are
treated as straight line segments.
 If the polyline is not closed, the start and end
points of the boundary are connected.
EDT 310 - Chapter 24 - External References
153
The XCLIP Command
 Polygonal.
 This
option allows an irregular polygon to be
drawn as a boundary.
 Is similar to the WPolygon selection option
 Allows a fairly flexible boundary definition.
EDT 310 - Chapter 24 - External References
154
The XCLIP Command
 The
clipping boundary is invisible by
default.
 Display
the boundary by setting the
XCLIPFRAME = 1.
EDT 310 - Chapter 24 - External References
155
Spatial and Layer Indexes
EDT 310 - Chapter 24 - External References
156
The XCLIP Command
 Spatial
and layer indexes are lists that
organize objects by their location in 3D
space and their layer name.
 If a drawing will be used as an external
reference, save the file with spatial and
layer indexes.
EDT 310 - Chapter 24 - External References
157
The XCLIP Command
 Spatial
and layer indexes help improve
the performance of AutoCAD when
referencing drawings with frozen layers
and dipping boundaries.
 Layers that are frozen are not loaded
when demand loading is enabled
 Any areas outside clipping boundaries
are also not loaded.
EDT 310 - Chapter 24 - External References
158
The XCLIP Command
 Create
spatial and layer indexes using
the Save Drawing As dialog box.
 1.
Pick the Options... button, and make
sure the DWG Options tab is active in
the Saveas Options dialog box.
 2.In
the 1-ndex type: drop-down list,
pick the type of index required. The
default option is None.
EDT 310 - Chapter 24 - External References
159
The XCLIP Command
 2.
In the Index type: drop-down list,
pick the type of index required.
 The
 3.Pick
default option is None.
OK, and then save the drawing.
EDT 310 - Chapter 24 - External References
160
Demand Loading
EDT 310 - Chapter 24 - External References
161
Demand Loading
 Demand
loading controls how much of an
external reference file is loaded when it
is attached to the master drawing.
 When
demand loading is enabled, the
only portion of the xref file loaded is
the part necessary to regenerate the
master drawing.
 This improves performance and saves
disk space.
EDT 310 - Chapter 24 - External References
162
Demand Loading
 Any
data on frozen layers, as well as any
data outside of clipping regions, is not
loaded.
 Demand
loading is enabled by default.
EDT 310 - Chapter 24 - External References
163
Demand Loading
 Change
Demand Loading under Tools
Options.
 Select
the Open and Save tab.
EDT 310 - Chapter 24 - External References
164
Demand Loading
 The
three demand loading options are
found in the Demand load Xrefs: dropdown list in the External References
(Xrefs) area.
EDT 310 - Chapter 24 - External References
165
Demand Loading
 The
options are described as follows:
 *Enabled.
 *Disabled.
 *Enabled with copy.
EDT 310 - Chapter 24 - External References
166
Demand Loading
 *Enabled.
 When
this option is active, demand
loading is turned on.
 While the drawing is being referenced,
the xref file is kept open and other
users cannot edit the file.
EDT 310 - Chapter 24 - External References
167
Demand Loading
 *Disabled.
 Enabling
loading.
this option turns off demand
EDT 310 - Chapter 24 - External References
168
Demand Loading
 *Enabled
with copy.
 When this option is active, demand
loading is turned on, and other users can
edit the original drawing because
AutoCAD uses a copy of the referenced
drawing.
EDT 310 - Chapter 24 - External References
169
Demand Loading
 NOTE:
Two additional settings in the
Open and Save tab of the Options dialog
box control the effects of changes
made to xrefdependent layers and inplace reference editing.
 The settings are controlled by check
boxes in the External References
(Xrefs) area.
 Each option is explained as follows:
EDT 310 - Chapter 24 - External References
170
Using XREFs In MultiView Layouts
EDT 310 - Chapter 24 - External References
171
Layouts
EDT 310 - Chapter 24 - External References
172
Layouts
 AutoCAD
has two designing
environments
 Model
space
 Paper space.
EDT 310 - Chapter 24 - External References
173
Layouts
 Model
space is the environment in which
you draw and design.
 Select
space.
the Model tab to select model
 All
drawings and models should be
created in model space.
EDT 310 - Chapter 24 - External References
174
EDT 310 - Chapter 24 - External References
175
Layouts
 Paper
space is used to create a layout of
the drawing prior to plotting.
 Paper
space is active when a layout tab
is selected.
EDT 310 - Chapter 24 - External References
176
Layouts
 Use
paper space to create a layout of
several different drawings and views,
each with different scales.
 You
can even mix 2D and 3D views in the
same paper space layout.
EDT 310 - Chapter 24 - External References
177
Viewports
EDT 310 - Chapter 24 - External References
178
Viewports
 Imagine
that the sheet of paper you are
creating will contain several cutouts
(viewports) through which you can see
model space.
EDT 310 - Chapter 24 - External References
179
EDT 310 - Chapter 24 - External References
180
Viewports
 Objects
and designs have been created
at full-size in model space.
EDT 310 - Chapter 24 - External References
181
Viewports
 To
make a viewport active, double-click
inside a viewport.
 Reference
displayed.
(insert) the drawing to be
EDT 310 - Chapter 24 - External References
182
Viewports
 Example:
 C-size
paper. 36” x 24”
 The first viewport is cut 12” wide and
12” high.
 You want to display the floor plan of a
house inside the opening.
EDT 310 - Chapter 24 - External References
183
Viewports
 Example:
 If
you then place the full-size model of
the floor plan directly behind the C-size
paper, the house will extend many feet
beyond the edges of the paper.
 How can you place the drawing within
the viewport?
EDT 310 - Chapter 24 - External References
184
Viewports
 Example:
 You
know the floor plan should be
displayed inside the viewport at a scale
of 1/4" = 1'-0".
 The scale factor of 1/4" = 1'-0" is 48.
EDT 310 - Chapter 24 - External References
185
Viewports
 Example:
 Therefore,
you need to move the floor
plan model away from the C-size paper
until it is 1/48 (reciprocal of 48) the
size it is now.
 When you do that, the entire floor plan
fits inside the viewport you cut.
EDT 310 - Chapter 24 - External References
186
Viewports
 This
is accomplished with the XP (times
paper space) option of the ZOOM
command.
EDT 310 - Chapter 24 - External References
187
Paper Space Initial Drawing Setup
EDT 310 - Chapter 24 - External References
188
Initial Drawing Setup
 1.
Place a border and title block on the
screen.
 Open or insert a predrawn standard
border and title block template.
EDT 310 - Chapter 24 - External References
189
Initial Drawing Setup
 The
Architectural, English units
template drawing is a D-size sheet.
 It contains one viewport, which shows
as a thin line just inside the left border
line.
 Erase this viewport before creating a
new one.
EDT 310 - Chapter 24 - External References
190
Initial Drawing Setup
 Finish
remainder of chapter 24.
EDT 310 - Chapter 24 - External References
191