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3D Spline PropertyManager

The 3D Spline PropertyManager controls the following properties of a sketched 3D spline:

Existing Relations

PM_relations_existing.gif Relations Displays relations inferenced automatically during sketching or created manually with Add Relations. When you select a relation in the list, a callout is highlighted in the graphics area.
PM_information.gif Information Displays the status of the selected sketch entity (Fully Defined, Under Defined, and so on).

Add Relations

You can add relations between spline points, between spline handles, and between spline handles and external sketch entities. Selections appear when the relevant geometry exists in the sketch.

Example of relations in 3D splines:

Relations include:
  • Handle along Y axis (1)
  • Spline points along X (2)
  • Tangent between spline and arc (3)


For construction Converts the entity to construction geometry.
Show Curvature Displays the Curvature Scale PropertyManager and adds curvature combs to the spline.
Maintain Internal Continuity Maintains the spline's internal curvature.

When Maintain Internal Continuity is cleared, the curvature scales down abruptly.

When Maintain Internal Continuity is selected, the curvature scales down gradually.


Specify any appropriate combination of the following parameters to define the spline if the spline is not constrained by relations.

PM_Spline_Point.gif Spline Point Number When you scroll through the points, the corresponding coordinates appear below.
PM_Start_X_Coordinate_Spline.gif X Coordinate The x coordinate of the spline point.
PM_Start_Y_Coordinate_Spline.gif Y Coordinate The y coordinate of the spline point.
PM_Start_Z_Coordinate_Spline.gif Z Coordinate The z coordinate of the spline point.
PM_Tangent_Magnitude_1.gif Tangent Weighting1 Controls the left tangency vector by modifying the spline’s curvature at the spline point.
PM_Tangent_Magnitude_2.gif Tangent Weighting 2 Controls the right tangency vector by modifying the spline’s curvature at the spline point.
PM_Tangent_Radial_Direction.gif Tangent Radial Direction Controls the tangency direction by modifying the spline’s angle of inclination relative to the X, Y, or Z axis.
PM_Tangent_Polar_Direction.gif Tangent Polar Direction Controls the elevation angle of the tangent vector with respect to a plane placed at a point perpendicular to a spline point.
You can also dimension to spline handles.
  Tangent Driving Enables spline control using Tangent Weighting, Tangent Radial Direction, and Tangent Polar Direction.
  Reset This Handle Returns the selected spline handle to its initial state.
  Reset All Handles Returns all spline handles to their initial state.
  Relax Spline When you first sketch a spline and display the control polygon, you can drag any node on the control polygon to change its shape. If dragging results in a spline that is not smooth, you can re-select the spline to display the PropertyManager and click Relax Spline under Parameters to re-parameterize (smooth) the shape. The Relax Spline command becomes available again by dragging a node on the control polygon.
  Proportional A proportional spline retains its shape when you drag the endpoints; the entire spline resizes proportionally. You can add dimensions and relations to internal points of proportional splines.

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