The best-fitting curve through the points is calculated. You can then use a dialog box to exclude any of the specified points or to select one or two pass-through points.
Note: When using the best fit commands for profile design, use the Create Parabola command for vertical curves.
To create an AutoCAD arc by best fit from
Autodesk Civil 3D points
If you are creating a best fit arc for a profile, set the profile view style vertical exaggeration to 1. See
To Work With Profile View Styles for more information.
Click
Home tabDraw panelBest Fit drop-downCreate Best Fit ArcFind.
Select three or more points. Enter
G to select a point group or
N to enter points by number.
As you select points in the drawing window, a white X marks each regression point and a temporary, dashed arc is displayed in real time.
Note: You must select at least three non-collinear regression points.
Press Enter to complete the command.
In the
Panorama window, use the
Regression Data vista to make changes to the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window will be highlighted in red.
Note: When the AutoCAD arc is created, it will not retain any link to the regression points.
Create the AutoCAD arc:
Click
to create the arc and keep the regression data. You may then use the data as a basis to create more arcs.
Click
to create the arc, clear the regression data, and close the Regression Data vista.
If desired, convert the AutoCAD arc to an alignment or profile entity.
To create an AutoCAD arc by best fit from AutoCAD points
If you are creating a best fit arc for a profile, set the profile view style vertical exaggeration to 1. See
To Work With Profile View Styles for more information.
Click
Home tabDraw panelBest Fit drop-downCreate Best Fit ArcFind.
In the
Arc By Best Fit dialog box, select
From AutoCAD Points.
Select three or more AutoCAD points.
As you select points in the drawing window, a white X marks each regression point and a temporary, dashed arc is displayed in real time.
Note: You must select at least three non-collinear regression points.
Press Enter to complete the command.
In the
Panorama window, use the
Regression Data vista to make changes to the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window will be highlighted in red.
Note: When the AutoCAD arc is created, it will not retain any link to the regression points.
Create the AutoCAD arc:
Click
to create the arc and keep the regression data. You may then use the data as a basis to create more arcs.
Click
to create the arc, clear the regression data, and close the Regression Data vista.
If desired, convert the AutoCAD arc to an alignment or profile entity.
To create an AutoCAD arc by best fit from existing entities
If you are creating a best fit arc for a profile, set the profile view style vertical exaggeration to 1. See
To Work With Profile View Styles for more information.
Click
Home tabDraw panelBest Fit drop-downCreate Best Fit ArcFind.
In the
Arc By Best Fit dialog box, select
From Entities. Specify the tessellation and mid-ordinate tolerance settings.
Select one or more of the entities listed at the command line.
Note: You may select several types of entities listed at the command line.
As you select entities in the drawing window, a white X marks each regression point and a temporary, dashed arc is displayed in real time.
Note: You must select at least three non-collinear regression points.
If you selected a profile object, specify the starting and ending station on the
Specify Station Range dialog box.
Press Enter to complete the command.
In the
Panorama window, use the
Regression Data vista to make changes to the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window will be highlighted in red.
Note: When the AutoCAD arc is created, it will not retain any link to the regression points.
Create the AutoCAD arc:
Click
to create the arc and keep the regression data. You may then use the data as a basis to create more arcs.
Click
to create the arc, clear the regression data, and close the Regression Data vista.
If desired, convert the AutoCAD arc to an alignment or profile entity.
To create an AutoCAD arc by best fit by clicking on screen
If you are creating a best fit arc for a profile, set the profile view style vertical exaggeration to 1. See
To Work With Profile View Styles for more information.
Click
Home tabDraw panelBest Fit drop-downCreate Best Fit ArcFind.
In the
Arc By Best Fit dialog box, select
By Clicking On The Screen.
Select a starting point and at least two other points.
Note: You may use OSNAP or transparent commands to select points.
As you select points in the drawing window, a white X marks each regression point and a temporary, dashed arc is displayed in real time.
Note: You must select at least three non-collinear regression points.
Press Enter to complete the command.
In the
Panorama window, use the
Regression Data vista to make changes to the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window will be highlighted in red.
Note: When the AutoCAD arc is created, it will not retain any link to the regression points.
Create the AutoCAD arc:
Click
to create the arc and keep the regression data. You may then use the data as a basis to create more arcs.
Click
to create the arc, clear the regression data, and close the Regression Data vista.
If desired, convert the AutoCAD arc to an alignment or profile entity.