Defining Curve Tangents
Define a tangent with the following attributes:
• Direction
• Length
• Angle—Measured on the active datum plane between the horizontal tangent direction and the tangent vector projection
• Elevation—Measured in degrees between the tangent reference datum plane and the tangent
• Draft—Measured in degrees and available when you apply a Draft Tangent
You can drag a tangent vector to change its angle or length. The Tangent settings on the Curve Edit tab can constrain vector movement during dragging. Each tangent has a reference plane for constraining the primary and elevation angles.
You can set the following directional constraints:
• Fix Angle—User-defined
• Horizontal—Horizontal relative to the grid of the active datum plane
• Vertical—Vertical relative to the grid of the active datum plane
• Normal—Perpendicular to a user-defined reference datum plane
• Align—Aligned with a reference location on another curve.
When you apply a directional constraint, you can change the tangent length.