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Tangent Editing

Some RoadRunner data models are built on top of curves and curve sequences, including roads, prop curves and polygons, marking curves and polygons, and the terrain surface graph. The control points of these curves contain tangents that can be adjusted to smooth or kink the resulting boundaries. This topic provides common steps for editing tangents and enforcing tangent continuity.

Adjust a Tangent

  1. Click the parent object to expose the tangent views.

    Note

    For some data types, such as road height profiles, the tangents are exposed once the parent is selected.

    For other data types, such as curves or polygons, this might require clicking the parent object first to expose the control points.

  2. Click the end point of the tangent handle.

  3. Click and drag to set the direction and scale of the tangent.

Make Tangents Continuous

To automatically enforce continuity, use the Connect Tangents operation:

  1. Click the parent object to expose the tangent views.

    Note

    For some data types, such as road height profiles, the tangents are exposed once the parent is selected.

    For other data types, such as curves or polygons, this might require clicking on the parent object first to expose the control points.

  2. Click the Connect Tangents button.

Tangents will now be enforced, even through additional edits.

Make Tangents Discontinuous

To remove automatic continuity constraints, use the Disconnect Tangents operation:

  1. Click the parent object to expose the tangent views.

    Note

    For some data types, such as road height profiles, the tangents are exposed once the parent is selected.

    For others, such as curve or polygons, this might require clicking the parent object first to expose the control points.

  2. Click the Disconnect Tangents button.

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