Unity-BezierCurves

Unity-BezierCurves is plugin for Unity which provides you with a BezierCurve GameObject.

System Requirements

Unity 5.1 or later versions.
I actually created the plugin with Unity 5.1 and haven't tried to run it with an older version. If you are using an older version of Unity, feel free to try it out. I don't think there are any reasons for it not to run in Unity 4.6.

Features

Curve modification directly in the Scene View via Key Points with Handles
Custom editor for Adding, Deleting and Reordering Key Points very easily
Full Undo/Redo integration

Ways to create a BezierCurve GameObject

From the Top Menu -> GameObjects -> Create Other -> Bezier Curve
Right click in the Hierarchy View -> Create Other -> Bezier Curve
Drag the prefab in the Scene (The prefab is located in "Assets/Bezier Curves/Prefabs" folder)

Code Examples

BezierCurve3D curve = GetComponent<BezierCurve3D>();

// Evaluate a position and rotation along the curve at a given time
float time = 0.5f; // In range [0, 1]
Vector3 position = curve.GetPoint(time);
Quaterion rotation = curve.GetRotation(time, Vector3.up);

// Get the length of the curve
// This operation is not very heavy, but I advise you to cache the length if you are going to use it
// many times and when you know that the curve won't change at runtime.
float length = curve.GetApproximateLength();

// Other methods
Vector3 tangent = curve.GetTangent(time);
Vector3 binormal = curve.GetBinormal(time, Vector3.up);
Vector3 normal = curve.GetNormal(time, Vector3.up);

// Add a key point at the end of the curve
BezierPoint3D keyPoint = curve.AddKeyPoint(); // via fast method
BezierPoint3D keyPoint = curve.AddKeyPointAt(curve.KeyPointsCount); // via specific index

// Remove a key point
bool isRemoved = curve.RemoveKeyPointAt(0); // Remove the first key point

// Foreach all key points
for (int i = 0; i < curve.KeyPointsCount; i++)
{
    Debug.Log(curve.KeyPoints[i].Position);
    Debug.Log(curve.KeyPoints[i].LeftHandleLocalPosition);
    Debug.Log(curve.KeyPoints[i].RightHandleLocalPosition);
}

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.