User Coordinate System






Define the User Coordinate System (UCS). Most structures in practice are composed of a combination of many different plane frames and modules of similar geometric characteristics. Each plane frame and modular unit can be singled out in a given coordinate system apart from the Global Coordinate System. This local coordinate system is conveniently selected to simplify the process of geometry generation. The User Coordinate System is referred to as the coordinate system set up by the user to ease the modeling task. Use also GCS or UCS in the Icon Menu to switch the working environment to and from UCS and GCS (Global Coordinate System). In addition, the use of UCS xy plane in conjunction with the use of grids to place the grid points of grid lines provides an effective modeling environment. 







From the Main Menu select Structure > UCS/Plan > UCS > X  Y Plane. From the Main Menu select Structure > UCS/Plan > UCS > X  Z Plane. From the Main Menu select Structure > UCS/Plan > UCS > Y  Z Plane. From the Main Menu select Structure > UCS/Plan > UCS > Three Points. From the Main Menu select Structure > UCS/Plan > UCS > Three Angles. From the Main Menu select Structure > UCS/Plan > UCS > Named Plane. From the Main Menu select Structure > UCS/Plan > UCS > UCS by UCS. From the Main Menu select Structure > UCS/Plan > UCS > Named UCS.






Select a desired tab in the dialog box and enter the related data. Activate UCS Plane Activate the UCS xy plane including the UCS origin point. Use Active All to activate the remaining parts of the model. Change View Direction Automatically change the View Point to view the model from the UCS (+)zdirection. XY Plane tabSet the UCS xy plane to be parallel with the GCS (Global Coordinate System) XY plane. Origin Enter the coordinates of the UCS origin point with respect to the GCS. Rather than typing in the coordinates, click the entry field and the relevant position in the working window. Angle When the UCS xy axes are rotated about the GCS Zaxis, enter the rotation angle with an appropriate sign using the righthand rule. XZ Plane tabSet the UCS xy plane to be parallel with the GCS XZ plane. Origin Enter the coordinates of the UCS origin point with respect to the GCS. Rather than typing in the coordinates, click the entry field and the relevant position in the working window. Angle When the UCS xy plane axes are rotated about the GCS negative Yaxis, enter the rotation angle with an appropriate sign using the righthand rule. YZ Plane tabSet the UCS xy plane to be parallel with the GCS YZ plane. Origin Enter the coordinates of the UCS origin point with respect to the GCS. Rather than typing in the coordinates, click the entry field and the relevant position in the working window. Angle When the UCS xy axes are rotated about the GCS Xaxis, enter the rotation angle with an appropriate sign using the righthand rule.
Three Points tabEnter the coordinates of the UCS origin point and the coordinates of 2 points on the UCS xy plane to define the UCS. Origin Enter the coordinates of the UCS origin point with respect to the GCS. Rather than typing in the coordinates, click the entry field and the relevant position in the working window. Pt. on xAxis. Enter the coordinates of a point on the UCS xaxis. Pt. on xy Dir. Enter the coordinates of a point on the UCS xy plane. Three Angles tabEnter the coordinates of the UCS origin point and 3 angles to define the UCS. Origin Enter the coordinates of the UCS origin point with respect to the GCS. Rather than typing in the coordinates, click the entry field and the relevant position in the working window.
Definition of UCS (Three Angles)Named Plane tabDefine the UCS xy plane by selecting a plane defined by Model > Named Plane. UCS by UCS tabDefine the UCS by modifying the currently defined UCS. x Rot: Angle of rotation about the current UCS xaxis y Rot: Angle of rotation about the current UCS yaxis z Rot: Angle of rotation about the current UCS zaxis Origin Point: Coordinates of the new UCS origin point relative to the current UCS Named UCS tabAccess and apply a UCS previously saved. To save the current UCS click at the bottom of the dialog box UCS Name Name of saved UCS Origin Point Origin coordinates of the new UCS (in GCS) ux: Direction vector of the new UCS in xdir. (in GCS) uy: Direction vector of the new UCS in ydir. (in GCS) 

