Road Height Tool



The Road Height Tool allows the manipulation of the vertical profile of roads.

The height profile is defined relative to the distance along the road and is constructed of straight line sections and quadratic (parabolic) blend sections. The height profile can also be converted to a sequence of cubics with tangents on nodes.

For tips on dealing with height alignment in intersections, see Resolve Triangulation Issues in Junctions.

Insert a New Height Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Right-click the road curve at which you want to insert a height node.
  4. Optionally, you can hold the right-click button and drag the height node to the desired height.

Alternatively, insert a height node from the 2D View Panel.

  1. Click the Road Height Tool or Road Plan Tool button.
  2. Click to select a road.
  3. In the 2D View Panel, right-click the road curve where you want to insert a height node.

Adjust the Height of a Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click and drag the node you want to edit to the desired height.
  4. Optionally, click the node and type the desired height into the Attributes Panel.

Alternatively:

  1. Click the Road Height Tool or Road Plan Tool button.
  2. Click to select a road.
  3. In the 2D View Panel, click and drag the node along the vertical axis.

Move a Height Node Along the Road

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click to select a node.
  4. Adjust the Distance value in the Attributes Panel.

Alternatively:

  1. Click the Road Height Tool or Road Plan Tool button.
  2. Click to select a road.
  3. In the 2D View Panel, click and drag the node along the horizontal axis.

Delete a Road Height Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click to select a node.
  4. Press the Delete key or select Edit > Delete from the Main Menu.

Adjust the Height of a Section Between Nodes

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click and drag the curve section you want to edit to the desired height.
  4. Optionally, click the curve section and type the desired height into the Attributes Panel. This value sets the height of the nodes at the start and end of the curve section.

Alternatively:

  1. Click the Road Height Tool or Road Plan Tool button.
  2. Click to select a road.
  3. In the 2D View Panel, click and drag the curve section along the vertical axis.

Adjust the Size of a Quadratic Blend Section

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click the height node in the middle of the blend section you want to edit. Two green dots appear at the limits of the blend region.
  4. Click and drag either of the green dots to adjust the range of the blend region.
  5. Optionally, you can type the desired blend range into the Attributes Panel. This value sets the height of the nodes at the start and end of the curve section.

Convert the Profile to Cubic Interpolation

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click Use Cubic Interpolation.

Convert the Profile to Quadratic Interpolation

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click Use Quadratic Interpolation.

Adjust the Tangent of a Height Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click the height node.
  4. Click and drag either of the green dots to adjust the slope.

Disconnect the Tangents of a Height Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click the height node.
  4. Click Disconnect Tangents.

Connect the Tangents of a Height Node

  1. Click the Road Height Tool button.
  2. Click to select a road.
  3. Click the height node.
  4. Click Connect Tangents.

Project Roads to Elevation Maps

RoadRunner can project one or more roads down to the height of an Elevation Map. This process samples the elevation data under the road and performs a constrained fit of the road elevation to the trace of the elevation data beneath the road.

Before Height Projection: Note the blue trace, which shows the height of the elevation map underneath the road.

After Height Projection:. Note how the road height (red trace) now aligns with the elevation map (blue trace) underneath the road.

  1. Click the Road Plan Tool button.
  2. Select the roads you want to project. (You can perform a Select All operation to select all roads in the scene).
  3. Click the Project Roads button on the Sub-Tool Bar.

There are two types of height projection that can be performed: a relaxed fit and a tight fit. The type of fit used depends on whether the road uses quadratic or cubic interpolations.

Relaxed Fit

If a road is using quadratic interpolation, a relaxed, approximate fit is used. This interpolation is best when the terrain data is either noisy or low resolution.

Tight Fit

If a road is using cubic interpolation, a much tighter fitting method is used. This interpolation is best when you want the road to closely match the heights of the elevation map.