static Keyframe SteppedKeyframe(float time, float value)
{
var result = new Keyframe {value = value, time = time};
//SetKeyTangentMode(ref result, 0, TangentMode.Editable | TangentMode.Stepped);
//SetKeyTangentMode(ref result, 1, TangentMode.Editable | TangentMode.Stepped);
return result;
}