This feature allows you to define the directrix with an existing line. When creating parabolas, keep the following in mind:

• In 2D construction mode, the directrix, the focal point, and the start and end positions are projected to the current construction plane. It creates the parabola in the current construction view, at the current depth.

• In 3D construction mode, the parabola is created in the plane that is defined by the directrix and the focus.

Using the Function:

1. Select Parabola from Line from the Create>Conic options.

2. Select an existing line to use as the directrix.

3. Indicate the parabola's focal position.

4. Indicate the parabola's first limit position. The start position is located by constructing a line that is perpendicular to the parabola and passes through the indicated limit position. The intersection of the parabola and the perpendicular line is the start position.

5. Indicate the parabola's second limit position.

NOTE: If the indicated position is not on the parabola, it is located in the same way as the start position.

Above > Example of Parabola by Line