Add a free, three-point curve entity by best fit to a profile. You can define the best fit entity using a series of AutoCAD Civil 3D points, existing entities, or clicks on screen.
The illustration shows a free vertical curve created by best fit between endpoints 1 and 2. The Xs indicates data points used to create the entity.
Each best fit profile entity is drawn to the vertical scale set in the profile view style. To create an accurate best fit entity, set the profile view style Vertical Exaggeration value to 1.000 to match the horizontal scale of the profile view. For more information, see Creating and Editing Profile View Styles.
See Also
To add a free vertical curve by best fit from AutoCAD Civil 3D points
- Set the profile view style Vertical Exaggeration value to 1.0000. See Creating and Editing Profile View Styles for more information.
- Click the profile. Click Profile tab
Modify Profile panelGeometry Editor
. - In the Profile Layout Tools toolbar, click
Free Vertical Curve - Best Fit. - Select an existing fixed or floating profile entity (the First Entity) from which to attach the best fit tangent.
- Select an existing fixed or floating profile entity (the Next Entity) to which to attach the best fit tangent.
- In the Curve by Best Fit dialog box, select From COGO Points.
- In plan view, select one or more points. Enter G to select a point group or N to enter points by number.
As the points are selected in plan view, an X marks each regression point and a temporary, dashed curve is displayed in the profile view.
- Press Enter to complete the command.
- In the Panorama window, use the Regression Data vista to modify the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window is highlighted in red.
- Create the curve:
- Click
to create the curve and keep the Regression Data vista open. - Click
to create the curve and close the Regression Data vista.
- Click
To add a free vertical curve by best fit by clicking on screen
- Set the profile view style Vertical Exaggeration value to 1.0000. See Creating and Editing Profile View Styles for more information.
- Click the profile. Click Profile tabModify Profile panelGeometry Editor .
- In the Profile Layout Tools toolbar, click Free Vertical Curve - Best Fit.
- Select an existing fixed or floating profile entity (the First Entity) from which to attach the best fit curve.
- Select an existing fixed or floating profile entity (the Next Entity) to which to attach the best fit curve.
- In the Curve by Best Fit dialog box, select By Clicking On The Screen.
- Select one or more points in the drawing.
As you select points in the drawing window, an X marks each regression point and a temporary, dashed curve is displayed in real time.
- Press Enter to complete the command.
- In the Panorama window, use the Regression Data vista to modify the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window is highlighted in red.
- Create the curve:
- Click to create the curve and keep the Regression Data vista open.
- Click to create the curve and close the Regression Data vista.
- Click
To add a free vertical curve by best fit from existing entities
- Set the profile view style Vertical Exaggeration value to 1.0000. See Creating and Editing Profile View Styles for more information.
- Click the profile. Click Profile tabModify Profile panelGeometry Editor .
- In the Profile Layout Tools toolbar, click Free Vertical Curve - Best Fit.
- Select an existing fixed or floating profile entity (the First Entity) from which to attach the best fit tangent.
- Select an existing fixed or floating profile entity (the Next Entity) to which to attach the best fit tangent.
- In the Curve by Best Fit dialog box, select By Clicking On The Screen. Specify the tessellation and mid-ordinate tolerance settings.
- Select one of the entities listed on the command line.
- If you selected a profile entity, specify the starting and ending station on the Specify Station Range dialog box.
- Repeat steps 7 and 8 to select other entities from which to create the best fit curve.
As you select entities in the drawing window, an X marks each regression point and a temporary, dashed curve is displayed in real time.
- Press Enter to complete the command.
- In the Panorama window, use the Regression Data vista to modify the regression points.
As you highlight a row in the Regression Data vista, the corresponding regression point in the drawing window is highlighted in red.
- Create the curve:
- Click to create the curve and keep the Regression Data vista open.
- Click to create the curve and close the Regression Data vista.
- Click