Keyframe.inTangent

Description

Sets the incoming tangent for this key. The incoming tangent affects the slope of the curve from the previous key to this key.

The incoming tangent matches the incoming slope of the curve. A positive value for inTangent results in a downward tangent, while a negative value results in an upward tangent.

Additional resources: outTangent.

using UnityEngine;

public class KeyFrameTangentExample : MonoBehaviour
{
    AnimationCurve  animCurve = null;

    void Start()
    {
        Keyframe[] ks = new Keyframe[3];

        ks[0] = new Keyframe(0, 0);
        ks[0].inTangent = 5f;    // -5 units on the y axis for 1 unit on the x axis.

        ks[1] = new Keyframe(4, 0);
        ks[1].inTangent = 0f;    // straight

        ks[2] = new Keyframe(6, 0);
        ks[2].inTangent = -5f;    // +5 units on the y axis for 1 unit on the x axis.

        animCurve = new AnimationCurve(ks);
    }

    void Update()
    {
        if (animCurve != null)
            transform.position = new Vector3(Time.time, animCurve.Evaluate(Time.time), 0);
    }
}