• Splines as easy-to-use components on game objects
  • A scene view tool to easily create and edit splines
  • Analysis tools to visualize curvature, preview animation, speed, and more
• Raw C# class API - use splines without a need for game objects
• Splines for float, Vector2, Vector3, Vector4, and Quaternion interpolation
• Supported splines:
  • Cubic Bézier
  • Cubic Catmull-Rom (Positional)
  • Cubic Catmull-Rom (Quaternionic)
  • Cubic Hermite
  • Cubic B-spline
  • Linear
  • Catenary
• Non-uniform splines, where knots/keyframes can have arbitrary time values, and allowing for advanced animation and shape parameterization

Mesh Generation

• Some sort of API for mesh generation, to extrude along a spline

Prefab Scattering

• An API for placing prefabs along a spline, with lots of control over placement location, frequency, randomness, orientation jitter, and more

Spline manipulation

• Direct editing and getting of information around knot values and knot intervals
• Support for splitting splines (knot insertion)

Evaluation Features

• Spline Sampling, getting data at a given point in the spline, such as:

  • Position, Velocity, Acceleration, Jerk (n:th derivatives)
  • Tangent, Normal, Bitangent, Frenet-Serret Orientation, Look Rotation
  • Curvature, Torsion

• Bounding box

• Spline length

• Arc-Length Parameterization ie: sampling by distance along spline

  • Allows you to animate with a constant (or any other) speed
  • Can be used to place objects with uniform spacing along the spline

• Rotation interpolation module

  • interpolates rotations using optional constraints, such as aligning to the up vector, aligning along the tangent direction, or interpolating using quaternion splines
  • support for parallel transport/rotation minimizing frames for those situations where you need to avoid twisting

• Proximity sampling

  ProximityToPoint ProximityToLine ProximityToRay ProximityToLineSegment

  • Returns a SplineProximityInfo struct with proximity information between the spline and a Point, Line, Ray, or Line Segment
  • Useful for things like, finding where you are along a racetrack, or for distance testing interactions with a spline

Open Questions