How to Draw a Tangent to a Curve in Autocad

Note:

Do not use the tangent line tools in the perspective window.

Draw a line tangent to a curve

1. Choose Keypoint Curve Tools > Line Tangent & Perp > Line Tangent to Curve .
2. Click the start point of the tangent line.
3. Click the curve you want the line to be tangent to.

   The Line Tangent to Curve tool calculates the end point for the line to be tangent to that curve.

   • If it cannot find a tangent, it prints a message in the prompt line.
   • If it finds more than one tangent, it uses the tangent closest to where you clicked.

Draw a tangent line between two curves

1. Choose Keypoint Curve Tools > Line Tangent & Perp > Line Tangent from/to Curve .
2. Click the first curve the tangent line will touch.
3. Click the second curve the tangent line will touch.

   The Line Tangent from/to Curve tool calculates the line tangent to both curves.

   • If it cannot find a tangent, it prints a message in the prompt line.
   • If it finds more than one tangent, it uses the tangent closest to where you clicked.

What if...?

I want to edit the coordinates, parallel distance, or angle after I create a line?

Choose Windows > Information > Information Window and change the parallel distance or angle.

The relationships between keypoint curves are maintained until you manually reshape one of the curves.

The tool does not create a true 3D tangent?

The tangent lines are only tangent in the current view. It is only a true 3D tangent if the curve and start point are planar.

To get a true 3D tangent, use the Line tool with curve snapping to place the first point on the curve, then snap to the tangent guideline.

Draw a line perpendicular from a curve

1. Choose Keypoint Curve Tools > Line Tangent & Perp > Line Perpendicular .

   A set of 6 buttons appear in the active window: True|Projected, From Curve|To Curve, Next|Change Settings. The settings from the option box show as active buttons. (See Line Perpendicular Options.)

2. If you need to change the settings, click Change Settings, then:
   • Click either True or Projected
   • Click From Curve

     Note:

     If you select Projected while in a Perspective window, you must turn off Perspective in the Viewing Panel ( + to get an orthographic view where the line appears as intended.

3. Select the curve from which you want to make the line perpendicular.
4. Select a point in space, or a curve.

   A keypoint line is created that extends from the point selected on the first curve (to which it is perpendicular) to the location closest to the point selected. If the second item selected was a curve, the line meets the curve at the point closest to where you clicked.

5. You can modify the position of the start point while in the tool and see the line update interactively. If the second item selected was a point, you can move the end point of the line to adjust its length.You can also type in the line length.
6. Click Next to create another line perpendicular with the same options. Or click Change Settings to choose different options.

Draw a line perpendicular to a curve

1. Choose Keypoint Curve Tools > Line Tangent & Perp > Line Perpendicular.

   A set of 6 buttons appear in the active window: True|Projected, From Curve|To Curve, Next|Change Settings. The settings from the option box show as active buttons. (See Line Perpendicular Options.)

2. If you need to change the settings, click Change Settings, then:
   • Click either True or Projected
   • Click To Curve

     Note:

     If you select Projected while in a Perspective window, you must turn off Perspective in the Viewing Panel ( + to get an orthographic view where the line appears as intended.

3. Select a point that will be the end of the perpendicular line. To select a point on geometry, hold the or + keys to snap to it.
4. Select a curve that the line will be perpendicular to.

   A keypoint line is created that extends from the selected point to the selected curve and is perpendicular to the curve.

   If no perpendicular line can be found on the curve to the specified point, linear extensions are built at the start or end of the curve, and the perpendicular is built from those.

5. You can modify the position of the end point while in the tool, and see the line update interactively.
6. Click Next to create another line perpendicular with the same options. Or click Change Settings to choose different options.

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Source: https://knowledge.autodesk.com/support/alias-products/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/Alias-Modeling/files/GUID-CA8FDB6C-AE18-4D46-B193-3B70E2526AC4-htm.html#:~:text=between%20two%20curves-,Choose%20Keypoint%20Curve%20Tools%20%3E%20Line%20Tangent%20%26%20Perp%20%3E%20Line%20Tangent,line%20tangent%20to%20both%20curves.

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