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Point Anchors

A Spline Point Anchor keeps an object attached to a point on a spline. When the spline changes or the spline's object moves, the anchored object follows. Use it for lamp posts at a road corner, a sign at the end of a path, or anything that must stay in place along a curve. It works in the editor and in Play mode.

Setting one up

  1. Select the object to attach and add Add Component > World Toolkit > Splines > Spline Point Anchor.
  2. Drag the object with the spline into Container. If it holds several splines, set Path Index (0 is the first).
  3. In Position, pick where to measure from (Start, End or a Knot), then how far along the spline.
  4. Choose what the spline controls with Anchor Position, Anchor Rotation and Anchor Scale, and add offsets if the object shouldn't sit exactly on the line.

Use the offsets, not the Move tool

While Anchor Position or Anchor Rotation is on, the anchor puts the object back on the spline whenever the spline changes. To shift the object, change Position Offset or Rotation Offset instead of moving it by hand.

Settings

Container and Path Index
The spline the object is attached to. Path Index picks the spline when the container has several.
Position

Where along the spline the object sits, in one row:

  • The point to measure from: Start or End of the spline, or a Knot. For a knot, type its number after K (the first knot is 0; turn on Show Knot Indexes in the Spline Settings to see the numbers).
  • The distance from that point, after +. Negative values go back toward the start.
  • Units measures that distance in world units along the spline. Percent measures it as a fraction of the spline's whole length: 0.5 is halfway.

Drag the K or + label left and right to change the value, like any Unity number label.

Anchor Position
Moves the object to the spline point. Position Offset is applied in the spline's own directions: X to the right, Y up, Z forward.
Anchor Rotation
Rotates the object to follow the spline direction. Rotation Offset adds an extra rotation on top.
Anchor Scale
If the spline has a Float Curve path data entry named Scale Data Name (Scale by default), the object is scaled by the curve's value at the anchor point, multiplied by Base Scale.