[중급] UCS - 좌표계 기준 변경

** 3D) UCS - 좌표계 기준 변경

▶ WCS(World Coordinate System) 절대좌표계 : (0,0,0)을 좌표로 하는 움직임이 없는 좌표계
▶ UCS(User Coordinate System) 사용자 좌표계 : 사용자가 정의한 곳을 원점으로 하는 좌표계
 
Origin ▷ 가장많이 쓰는 옵션으로 Vpoint 각도를 유지하면서 개체로 원점만 이동
ZAxis ▷ Origin 옵션과 비슷
3point ▷ 90도 면이 아닌 경사면에 작업을 해야할 경우 사용
OBject ▷ 새로운 각도의 개체를 클릭하면 그 개체와 같은 새로운 Ucs 설정
View ▷ Vpoint 와 관계없이 현재 보이는 화면이 X-Y 가 됩니다. 작업중 text 작업이 필요한 경우 사용하면 유용
X/Y/Z ▷ 지정된 축을 중심으로 다른 두 축을 회전
Prev ▷ 바로 전에 설정된 Ucs 로 돌아감. 10개까지 추적 가능
Restore ▷ 저장된 Ucs를 가져옴. ?: 목록확인
Save ▷ 현 좌표계를 저장
Del ▷ 저장된 좌표계를 삭제
World ▷ Wcs 좌표계로 바꿈

 

 

-- 도움말 내용 --

Manages user coordinate systems

 Toolbar: UCS
 Menu: Tools  New UCS  WorldDoes not exist in the menus.
 Command entry: ucs
Specify Origin of UCS or [Face/NAmed/OBject/Previous/View/World/X/Y/Z/ZAxis] <World>:

Specify Origin of UCS

Defines a new UCS using one, two, or three points. If you specify a single point, the origin of the current UCS shifts without changing the orientation of the X, Y, and Z axes.

 

Specify point on X-axis or <Accept>: Specify a second point or press ENTER to limit input to a single point

If you specify a second point, the UCS rotates around the previously specified origin point such that the positive X axis of the UCS passes through the point.

 

Specify point on XY plane or <Accept>: Specify a third point or press ENTER to limit input to two points

If you specify a third point, the UCS rotates around the X axis such that the positive Y half of the XY plane of the UCS contains the point.

 

NoteIf you enter the coordinates for a point and you do not specify a Z coordinate value, the current Z value is used.
Face

Aligns the UCS to the selected face of a 3D solid. 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.

Named

Save and restore commonly used UCS orientations by name.

Enter an option [Restore/Save/Delete/?]: Specify an option

Restore

Restores a saved UCS so that it becomes the current UCS.

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.

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 this program 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.

UCS name(s) to list <*>: Enter a name list or press ENTER to list all UCSs

Delete

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

If you delete a named UCS that is current, the current UCS is renamed UNNAMED.

?—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

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 objects cannot be used with this option: 3D polylines, 3D meshes, and xlines.

For most objects, the origin of the new UCS is located at the nearest vertex to where you select the object, and the X axis is aligned with an edge or is tangent to an edge. For planar objects, the XY plane of the UCS is aligned with the plane in which the object is located. For complex objects, the origin is relocated, but the current orientation of the axes is maintained.

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. The new X axis is set 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 UCS.
 
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.
 
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.
 
Trace
 The “from” point of the trace becomes the UCS origin, with the X axis lying along its centerline.
 
3D face
 The new UCS origin is taken from the first point, the X axis from the first two points, and the Y positive side from the first and fourth points. The Z axis follows by application of the right-hand rule.
 
Shape, 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 about its extrusion direction. The object you select to establish a new UCS has a rotation angle of zero in the new UCS.
 

Previous

Restores the previous UCS. The program retains the last 10 coordinate systems created in paper space and the last 10 coordinate systems created in model space. Repeating this option steps back through one set or the other, depending on which space is current.

If you have saved different UCS settings in individual viewports and you switch between viewports, the different UCSs are not retained in the Previous list. However, if you change a UCS setting within a viewport, the last UCS setting is retained in the Previous list. For example, changing the UCS from World to UCS1 would retain World at the top of the Previous list. If you then switch viewports with Front as the current UCS, and then change the UCS to Right, the Front UCS is retained at the top of the Previous list. If you then choose the UCS Previous option twice in this viewport, the UCS setting changes to Front, and then back to World. See the UCSVP system variable.

View

Establishes a new coordinate system with the XY plane perpendicular to your viewing direction (parallel to your screen). The UCS origin remains unchanged.

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.

 

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.

 

You can define any UCS by specifying an origin and one or more rotations around the X, Y, or Z axis.

 

Z Axis

Defines a UCS with a specified positive Z axis.

Specify new origin point or [Object] <0,0,0>: Specify a point or enter o

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.

Object
Aligns the Z axis in the direction tangent to the endpoint nearest to where the object was selected. The positive Z axis points away from the object.

Select object: Select an open-ended object

Apply

Applies the current UCS setting to a specified viewport or all active viewports when other viewports have a different UCS saved in the viewport. The UCSVP system variable determines whether a UCS is saved with a viewport.

Pick viewport to apply current UCS or [All] <current>: Specify a viewport by clicking inside it, enter a, or press ENTER

Viewport
Applies the current UCS to the specified viewport and ends the UCS command.

All
Applies the current UCS to all active viewports.

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