Compositing in 3D Space with Action > About 3D Paths > Creating Splines >

# Changing Spline Display Properties

You can change spline display properties in the Display tab. For example, you can change the colour of tangents on the splines you draw. This is useful to better contrast the spline’s tangents from the clip so that they are easier to work with.

Normals button
  Enable to display normals along the 3D path.

Normals colour pot
  Displays the normals colour. Editable.

Spacing field
  Displays the space between the displayed normals, in pixels. Also used to calculate the position of the object on the path. A lower value may result in better positioning and smoother movement of the object, but rendering may be slower. Editable.

Scale field
  Displays the scale of the displayed normals, in pixels. Editable.

Spline colour pot
  Displays the colour for the display of splines. Editable.

Tangents colour pot
  Displays the colour for the display of tangents. Editable.