Difference Between Ucs And Wcs. You can relocate the user coordinate system with methods such as the following: Move the UCS by defining a new origin point. Align the UCS with an existing object. Rotate the UCS by specifying a new origin point and a point on the new X axis. Rotate the current UCS a specified angle around the Z axis. If you use an AutoCAD based product for 3D work you will have to consider using the UCS to change views to work on the model. A common question from AutoCAD users when using the UCS is: ”Is there a method to have the UCS command always default to either TOP or WORLD regardless of what view is selected from VIEW TAB?”. Differentiate Between Ucs And Wcs In Autocad. Start studying AutoCAD final. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Dec 15, 2015 - All objects in a drawing are defined by their coordinates in the World Coordinate System (WCS), which cannot be moved or rotated. Objective: Explain the relationship of the WCS icon (World Coordinate System) to the AutoCAD coordinate system. Explain the difference between the WCS and the UCS (User Coordinate System).

• Differentiate Between Ucs And Wcs In Autocad Pdf
• Change The Ucs In Autocad
• Differentiate Between Ucs And Wcs In Autocad 2017
• Ucs In Autocad

Understanding the World and User Coordinate systems in AutoCAD

The World Coordinate System is based on the Cartesian Coordinate System. Having an understanding of this coordinate system (which many people have, despite of probably never heard of the name) is essential to understanding how the WCS (and UCS) work within AutoCAD. Some of what is written below (quotes) I have taken from the AutoCAD 2010 Users Guide.

There are two coordinate systems: a fixed system called the world coordinate system (WCS) and a movable system called the user coordinate system (UCS). By default, these two systems are coincident in a new drawing.

Normally in 2D views, the WCS X axis is horizontal and the Y axis is vertical. The WCS origin is where the X and Y axes intersect (0,0). All objects in a drawing file are defined by their WCS coordinates. However, it is usually more convenient to create and edit objects based on the movable UCS.

By default when you start a new (blank) drawing you use the World Coordinate System (WCS). This is your (0,0,0) point. Looking at the UCS icon, the square in the crosshairs tells you, you are using the World Coordinate System. This is also clear when looking below the compass. In the screenshot below you can see the WCS is active. When clicking on arrow it shows you have the WCS active and gives you the option to create a new User Coordinate System (UCS).

How to work with the User Coordinate System?

Virtually all coordinate entry as well as many other tools and operations reference the current UCS. 2D tools and operations that depend on the location and orientation of the UCS include the following:

• Absolute and relative coordinate entry
• Absolute reference angles
• Definition of horizontal and vertical for Ortho mode, polar tracking, object snap tracking, grid display, and grid snap
• Orientation of horizontal and vertical dimensions
• Orientation of text objects
• View rotation using the PLAN command

Moving or rotating the UCS can make it easier to work on particular areas of a drawing.

You can relocate the user coordinate system with methods such as the following:

• Move the UCS by defining a new origin point.
• Align the UCS with an existing object.
• Rotate the UCS by specifying a new origin point and a point on the new X axis.
• Rotate the current UCS a specified angle around the Z axis.
• Revert to the previous UCS.
• Restore the UCS to be coincident with the WCS.

Each of these methods have a corresponding option in the UCS command. Once you have defined a UCS, you can name it and then restore it when you need to use it again.

For instance: If you want to set a drawing to a newly determined zero-point, so you can use that particular point as the starting point for a coordinate system you need to use, you can just move the UCS to that new point. That point will then be the (0,0,0) point. You can even change the UCS angle if that is required. You can name them and save them, so you can switch between them. In Paperspace you need to keep in mind that the UCS only has a (0,0) point: An ‘X’ and a ‘Y’ coordinate.

When moving the UCS origin (see pictures below) you can see the square in the crosshairs is gone, meaning you use the User Coordinate System. Instead of seeing WCS underneath your compass you now see ‘Unnamed’, meaning your active UCS is still unnamed.

To save your newly determined UCS do the following:

1. Click View tab>UCS panel>Named UCS. The new UCS is displayed in the UCS list as UNNAMED.
2. In the UCS dialog box, Named UCSs tab, select UNNAMED and enter a new name. (You can also select UNNAMED, and right-click. Click Rename.)
3. Click OK. You can use up to 255 characters, including letters, digits, and the special characters dollar sign ($), hyphen (-), and underscore (_). All UCS names are converted to uppercase.

When you have determined a new UCS origin, and want to switch back to the World Coordinate System, you need to save you new UCS before you switch. Otherwise the new point UCS point will be lost.

There is much, much more to say about the UCS system, but these things are just the basics. Of course the command to use to manipulate your UCS is:

UCS

This will give you all sorts of options (to move, rotate, name, etc.) for your UCS.

Unfortunately, in the Civil/Survey discipline, not all projects are aligned in the real world the way that we want to view them on paper. Typically, in modelspace, north is always up in the Y direction. So a road bearing N32° 00’00'E will look like this:

Understand the World and User Coordinate Systems There are two coordinate systems: a fixed system called the world coordinate system (WCS) and a movable system called the user coordinate system (UCS). Objective: Explain the relationship of the WCS icon (World Coordinate System) to the AutoCAD coordinate system. Explain the difference between the WCS and the UCS (User Coordinate System). The World Coordinate System is based on the Cartesian Coordinate System. Having an understanding of this coordinate system (which many people have, despite of probably never heard of the name) is essential to understanding how the.

FIGURE 1

But when we present this on paper, we want the plot drawing to look like this:

FIGURE 2

In order to get from figure 1 to figure 2, we somehow have to twist the drawing. There are essentially three ways that we can do this:

1. Softdesk North Rotation - Rotate the roadway entities in the master drawing. After doing this, we can also set the Softdesk North Rotation. The purpose of setting the North Rotation is to essentially fake Softdesk into thinking that north is no longer up in the Y direction. It is now in a direction corresponding to the rotation of the roadway. Even though the roadway is rotated, north has been rotated as well to maintain accuracy.

2. Dview Twist - Rotate the world coordinate system. In this case the roadway drawing entities are not rotated. The entire world is rotated.

3. UCS - UCS stands for user coordinate system. By default, when you start a drawing, the user coordinate system is the same as the world coordinate system, which never changes. However, you can change the user coordinate system. Using this method, the UCS can be rotated in accordance with the road.

Also realize that twist is very important in relation to annotation. Before annotating the roadway in figure 1, the user had to know how to orient the text based on the desired twist. Choosing a method of rotation should therefore take into account the ease with which text can be oriented.

So what method should be used? Unfortunately, they are all fairly complicated. Users should have a high degree of proficiency in AutoCAD before using any of these methods. Each method has its advantages and disadvantages and they are discussed next.

Softdesk North Rotation
Advantages
a) For proper Softdesk Cogo labeling orientation and accuracy, this is the best method.
Disadvantages
a) Setting a north rotation other than the Y direction can be very dangerous if you forget that it’s set or another user does not know it’s set. All Softdesk defined alignments, dtm’s, pipes, etc. are based on the changed north rotation. Inconsistent data can therefore be created between users with different north rotations.

b) Equating initial survey information to post-design stakeout can sometimes be difficult.

c) If the user needs different orientations in different sheets or viewports, north rotation cannot help. It is only useful for one orientation.

d) The same North Rotation has to be set individually for every plan drawing in the project.

Dview Twist
Advantages
a) The accuracy and consistency of Softdesk data will not be effected. The entire world is being rotated, so the relationship between the drawing information and the coordinate system does not change.

b) Different dview twists can be set in different viewports and drawings.
Disadvantages
a) It can be difficult to correctly orient Softdesk cogo labels and AutoCAD text and dimensions.

b) It can be difficult to set the exact desired orientation.

UCS
Advantages
a) It is easy to correctly orient AutoCAD text and dimensions.
Disadvantages

a) When the UCS is set to something other than the world coodinate system (WCS), creating and defining Softdesk alignments, dtm’s, pipes, etc. will result in inaccurate and bogus Softdesk data.

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b) When the UCS is set to something other than the WCS, drawings that are externally referenced will be inaccurately located.

c) When the UCS is set to something other than the WCS, lines and curves cannot be labeled accurately with Softdesk label commands.

d) One drawing can have only one UCS. It’s not possible to have different twists in different viewports using UCS.

Conclusion

CMI believes that Dview Twist is the best method to use. The disadvantages of using the Softdesk north rotation or UCS rotation far outweigh any advantages of UCS / north rotation and disadvantages of dview twist. Accuracy of data is most important and both UCS and north rotation can have a negative impact on accuracy.

Expert users will sometimes use a combination of dview twist and UCS. This may be okay as long as the user understands the ramifications of using UCS and always sets the UCS back to the WCS when working in Softdesk, externally referencing a drawing, or finishing a drawing. But if a user doesn’t remember to set the UCS to the WCS to do these tasks (very possible), drawing accuracy can be affected.

Extends objects to meet the edges of other objects.

To extend objects, first select the boundaries. Then press Enter and select the objects that you want to extend. To use all objects as boundaries, press Enter at the first Select Objects prompt.

The following prompts are displayed.

Current settings: Projection = current, Edge = current

Select boundary edges..

Select objects or <select all>: Select one or more objects and press Enter, or press Enter to select all displayed objects

Differentiate Between Ucs And Wcs In Autocad Pdf

Select object to extend or shift-select to trim or [Fence/Crossing/Project/Edge/Undo]: Select objects to extend, or hold down SHIFT and select an object to trim, or enter an option

Boundary Object Selection

Uses the selected objects to define the boundary edges to which you want to extend an object.

Object to Extend

Specifies the objects to extend. Press Enter to end the command.

Shift-Select to Trim

Trims the selected objects to the nearest boundary rather than extending them. This is an easy method to switch between trimming and extending.

Fence

Selects all objects that cross the selection fence. The selection fence is a series of temporary line segments that you specify with two or more fence points. The selection fence does not form a closed loop.

Crossing

Selects objects within and crossing a rectangular area defined by two points.

Project

Specifies the projection method used when extending objects.

None

Specifies no projection. Only objects that intersect with the boundary edge in 3D space are extended.

UCS

Specifies projection onto the XY plane of the current user coordinate system (UCS). Objects that do not intersect with the boundary objects in 3D space are extended.

View

Specifies projection along the current view direction.

Change The Ucs In Autocad

Edge

Extends the object to another object's implied edge, or only to an object that actually intersects it in 3D space.

Extend

Extends the boundary object along its natural path to intersect another object or its implied edge in 3D space.

Differentiate Between Ucs And Wcs In Autocad 2017

No Extend

Specifies that the object is to extend only to a boundary object that actually intersects it in 3D space.

Undo

Ucs In Autocad

Reverses the most recent changes made by EXTEND.