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Curve Editing

Purple polygon curve with red control points and green tangent lines

Some RoadRunner data models are built on top of curve sequences, including roads, prop curves, and marking curves. This topic provides common steps to create, delete, and modify these curve instances.

For general information about selecting and deleting objects, see Design Scenes.

Create a New Curve

  1. Select the curve tool that corresponds to the type you want to create (for example, select the Marking Curve Tool if you want to build a marking curve).

  2. Some tools will require an appropriate asset to be selected in the Library Browser before a curve can be created (for example, select Lane Marking Assets to create marking curves).

  3. Ensure that no objects are selected (for example, by selecting Edit and then Deselect All in the menu bar).

  4. Right-click (and optionally drag) to create a curve with a single starting point. The new curve will automatically be assigned the selected asset.

  5. Right-click (and optionally drag) to extend the curve by adding additional control points.

Extend a Curve at Its Ends by Adding Control Points

  1. Select the curve tool that corresponds to the type you want to modify (for example, select the Marking Curve Tool to build a marking curve).

  2. Select the curve you want to edit.

  3. Click a control point at the end that you want to extend.

  4. Right-click (and optionally drag) to add an additional control point.

Add Control Points to the Interior of a Curve

  1. Select the curve tool that corresponds to the type you want to modify (for example, select the Marking Curve Tool to build a marking curve).

  2. Select the curve you want to edit.

  3. Right-click (and optionally drag) the curve at the location where you want to insert a new control point.

Move a Control Point

  1. Select the curve tool that corresponds to the type you want to modify (for example, select the Marking Curve Tool to build a marking curve).

  2. Select the curve you want to edit.

  3. Click and drag a control point to move it to a new location.

Change the Tangents of a Curve

See Tangent Editing.