Bei mir besagt die 2004er Hilfe (also haben wir da nach oben wiedermal einen rückschritt in der Hilfe...):
Zitat:
UCS Command Manages user coordinate systems
The user coordinate system (UCS) is a movable coordinate system for coordinate entry, planes of operation, and viewing. Most AutoCAD LT geometric editing commands are dependent on the location and orientation of the UCS; objects are drawn on the XY plane of the current UCS.
The UCS command sets the orientation of the user coordinate system in three-dimensional space. It defines the orientation for two-dimensional objects and the extrusion direction for the THICKNESS system variable. It also provides the axis of rotation for ROTATE and the default projection plane for specifying points.
When you use the pointing device to locate a point, it's normally placed on the XY plane. If the UCS is rotated so that the Z axis lies in a plane parallel to the viewing plane—that is, if the XY plane is edge-on to the viewer—it may be difficult to visualize where the point will be located. In this case, the point will be located on a plane parallel to your viewing plane that also contains the UCS origin point. For example, if the viewing direction is along the X axis, coordinates specified with a pointing device will be located on the YZ plane, which contains the UCS origin point.
Changing from one UCS to another does not change the drawing view unless the UCSFOLLOW system variable is on.
UCS toolbar:
Tools menu: New UCS
Command line: ucs
Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/?/World] <World>:
New
Defines a new coordinate system by one of six methods.
Specify origin of new UCS or [ZAxis/3point/OBject/Face/View/X/Y/Z] <0,0,0>:
Origin
Defines a new UCS by shifting the origin of the current UCS, leaving the direction of its X, Y, and Z axes unchanged.
Specify new origin point <0,0,0>: Specify a point
Specify a new origin point relative to the origin of the current UCS. If you do not specify a Z coordinate value for the origin, this option uses the current elevation.
Z Axis
Defines a UCS with a particular positive Z axis.
Specify new origin point <0,0,0>: Specify a point
Specify point on positive portion of Z-axis <current>: Specify a point
Specify a new origin and a point that lies on the new positive Z axis. The Z axis option tilts the XY plane.
3 Point
Specifies the new UCS origin and the direction of its positive X and Y axes. The Z axis follows by applying the right-hand rule. (For information about the right-hand rule, see Use World and User Coordinate Systems in 3D in the User's Guide.) You can use this option to specify any possible coordinate system.
Specify new origin point <0,0,0>: Specify a point (1)
Specify point on positive portion of X-axis <current>: Specify a point (2)
Specify point on positive-Y portion of the UCS XY plane <current>: Specify a point (3)
The first point specifies the origin of the new UCS. The second point defines the positive X axis. The third point defines the positive Y axis. The third point can be anywhere on the positive Y portion of the new UCS XY plane.
Object
Defines a new coordinate system based on a selected 3D object. The new UCS has the same extrusion direction (positive Z axis) as that of the selected object.
Select object to align UCS: Select an object
The following AutoCAD LT objects cannot be used to align a UCS: 3D polyline, viewport, region, spline, ellipse, ray, xline, leader, multiline text.
For objects other than 3D faces (available only when viewing AutoCAD drawings), the XY plane of the new UCS is parallel to the XY plane in effect when the object was drawn. However, the X and Y axes can be rotated differently.
The new UCS is defined as shown in the following table. Define a UCS by selecting an object
Object
Method of determining UCS
Arc
The center of the arc becomes the new UCS origin. The X axis passes through the arc endpoint that is closest to the selection point.
Circle
The center of the circle becomes the new UCS origin. The X axis passes through the selection point.
Dimension
The midpoint of the dimension text becomes the new UCS origin. The direction of the new X axis is parallel to the X axis of the UCS in effect when the dimension was drawn.
Line
The endpoint nearest the selection point becomes the new UCS origin. AutoCAD LT chooses the new X axis so that the line lies in the XZ plane of the new UCS. The line's second endpoint has a Y coordinate of zero in the new system.
Point
The point becomes the new UCS origin.
2D polyline
The start point of the polyline is the new UCS origin. The X axis extends along the line segment from the start point to the next vertex.
2D Solid
The first point of the solid determines the new UCS origin. The new X axis lies along the line between the first two points.
Text, block reference, attribute definition
The insertion point of the object becomes the new UCS origin, and the new X axis is defined by the rotation of the object around its extrusion direction. The object you select to establish a new UCS has a rotation angle of zero in the new UCS.
Face
Aligns the UCS to the selected face of a 3D solid created in AutoCAD. To select a face, click within the boundary of the face or on the edge of the face. The face is highlighted and the UCS X axis is aligned with the closest edge of the first face found.
Select face of solid object:
Enter an option [Next/Xflip/Yflip] <accept>:
Next
Locates the UCS on either the adjacent face or the back face of the selected edge.
Xflip
Rotates the UCS 180 degrees around the X axis.
Yflip
Rotates the UCS 180 degrees around the Y axis.
Accept
If you press ENTER, accepts the location. The prompt repeats until you accept a location.
View
Establishes a new coordinate system with the XY plane perpendicular to your viewing direction (parallel to your screen). The UCS origin remains unchanged.
X, Y, Z
Rotates the current UCS about a specified axis.
Specify rotation angle about n axis <0>: Specify an angle
In the prompt, n is X, Y, or Z. Enter a positive or negative angle to rotate the UCS. AutoCAD LT uses the right-hand rule to determine the positive direction of rotation around the axis. (For information about the right-hand rule, see Use World and User Coordinate Systems in 3D in the User's Guide.)
You can define any UCS by specifying an origin and one or more rotations around the X, Y, or Z axes.
Move
Redefines a UCS by shifting the origin or changing the Z-depth of the current UCS, leaving the orientation of its XY plane unchanged. Changing the Zdepth moves the UCS along its Z axis in a positive or negative direction relative to the current origin.
Specify new origin point or [Zdepth] <0,0,0>: Specify a point or enter z
New Origin
Changes the origin of the UCS.
Zdepth
Specifies the distance along the Z axis to move the UCS origin.
Specify Zdepth <0>: Enter a distance or press ENTER
Orthographic
Specifies one of the six orthographic UCSs provided with AutoCAD LT. These UCS settings are typically used when viewing and editing 3D models.
Enter an option [Top/Bottom/Front/BAck/Left/Right] <current>: Enter an option or press ENTER
By default the orthographic UCS settings orient the current UCS relative to the world coordinate system (WCS) origin and orientation. The UCSBASE system variable controls the UCS upon which the orthographic settings are based. The origin or Zdepth of the orthographic UCS settings can be changed using the Move option of the UCS command.
Prev
Restores the previous UCS. AutoCAD LT retains the last 10 coordinate systems created in paper space and the last 10 coordinate systems created in model space. Repeating the Prev option steps back through one set or the other, depending on which space is current.
Restore
Restores a saved UCS so that it becomes the current UCS. Restoring a saved UCS does not reestablish the viewing direction in effect when the UCS was saved.
Enter name of UCS to restore or [?]: Enter a name or enter ?
Name
Specifies a named UCS.
?—List UCSs
Lists the names of currently defined UCSs. AutoCAD LT prompts:
Enter UCS name(s) to list <*>: Enter a name list or press ENTER to list all UCSs
Save
Saves the current UCS to a specified name. The name can have up to 255 characters and can include letters, numbers, blank spaces, and any special character not used by Microsoft® Windows® and AutoCAD LT for other purposes.
Enter name to save current UCS or [?]: Enter a name or enter ?
Name
Saves the current UCS with the specified name.
?—List UCSs
Lists the names of currently defined UCSs. AutoCAD LT prompts:
UCS name(s) to list <*>: Enter a name list or press ENTER to list all UCSs
Del
Removes the specified UCS from the list of saved user coordinate systems.
Enter UCS name(s) to delete <none>: Enter a name list or press ENTER
?—List UCSs
Lists names of user coordinate systems and provides the origin and X, Y, and Z axes for each saved UCS relative to the current UCS. If the current UCS is unnamed, it is listed as WORLD or UNNAMED, depending on whether it's the same as the WCS.
UCS name(s) to list <*>: Enter a name list
World
Sets the current user coordinate system to the world coordinate system. The WCS is the basis for all user coordinate systems and cannot be redefined.
[Diese Nachricht wurde von tunnelbauer am 08. Jul. 2008 editiert.]
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