To Add Fixed Tangents to Profiles

To add a fixed vertical tangent with two points

Add a fixed vertical tangent by specifying two points that the line will pass through.

1. Click the profile. Click Profile tabModify Profile panelGeometry Editor Find.
2. On the Profile Layout Tools toolbar, click Draw Fixed Tangent By Two Points.
3. Specify the start point.
4. Specify the next point.

To add a fixed vertical tangent by best fit

Add a fixed, two-point vertical tangent entity by best fit to a profile. You can define the best fit entity using a series of Autodesk Civil 3D points or clicks on screen.

The following illustration shows a fixed vertical tangent created by best fit. The Xs indicate the data points that were used to create the entity.

Note: 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.

1. Set the profile view style Vertical Exaggeration value to 1.0000.
2. Click the profile. Click Profile tabModify Profile panelGeometry Editor Find.
3. On the Profile Layout Tools toolbar, click Fixed Tangent - Best Fit.
4. In the Tangent by Best Fit dialog box, select one of the following:
   • From COGO Points. In plan view, select two or more points. Enter G to select a point group or N to enter points by number.
   • By Clicking On The Screen. Select a starting point and at least one other point. You can use OSNAP or transparent commands to select points.
   • From Entities. Specify the tessellation and mid-ordinate tolerance settings. You can select one or more of the entity types listed on the command line. If you selected a profile entity, specify the starting and ending station on the Specify Station Range dialog box.
   As you select points or entities in the drawing window, an X marks each regression point and a temporary, dashed line is displayed in real time. Press Enter to complete the command.
5. 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.

6. Create the tangent:
   • Click to create the tangent and keep the Regression Data vista open.
   • Click to create the tangent and close the Regression Data vista.