Simple splines movement

[shills]

Hello! I have a hard time figuring out how to do a basic spline movement system as I had using Unity Splines. Maybe you can help?

For context, I'm working on a drone flying game on mobile. The drone is controlled via a joystick UI that manage both acceleration/deceleration and offset around the spline. Everything work as expected, but the drone takes forever to turn a curve (using bezier). I have watched your API video and I though I understood the TF vs Distance differences, I guess I'm confused as to how to use that information.  

The whole movement loop is done in an Update method:

Code:

        private void Update()
        {
            ReadJoystickDirection();
            EvaluateSpeed();
            MoveAlongSpline();
        }

The EvaluateSpeed part is straigthforward. We lerp to max speed on input.Started and lerp back to 0 if input.Canceled.

Here is the MoveAlongSpline method:

Code:

private void MoveAlongSpline()
{
    if (!IsMoving && _hasFinishedMoving)
        return;

    _splinePosition += CurrentSpeed * Time.deltaTime;

    // calculate position and rotation on the spline
    Vector3 splinePoint = _splineController.Spline.Interpolate(_splinePosition, Space.World);
    Vector3 tangent = _splineController.Spline.GetTangent(_splinePosition, Space.World);

    // calculate offset
    OffsetPosition();

    // Rotate the player to face the tangent and move the player along the spline
    _player.SetPositionAndRotation(splinePoint + _offset, Quaternion.LookRotation(tangent));

    // Update mini map icon position
    SplinePointUpdated?.Invoke(splinePoint);
}

I have tried to convert _splinePosition with float distance = _splineController.Spline.TFToDistance(_splineposition), but the behaviour was the same.

Any idea? Thanks

[_Aka_]

Hi,

Have you thought about using the Spline Controller instead of recreating its behavior via code? You can control the spline controller via APi. You will only have to set the offset and speed parameters, and the controller will take care of the rest.

If coding everything yourself is indeed what you want, then, and assuming CurrentSpeed is in distance/time:

Code:

    Vector3 splinePoint = _splineController.Spline.InterpolateByDistance(_splinePosition, Space.World);

This change should do it. If you still have issues, please let me know.

[shills]

Hi,

Have you thought about using the Spline Controller instead of recreating its behavior via code? You can control the spline controller via APi. You will only have to set the offset and speed parameters, and the controller will take care of the rest.

If coding everything yourself is indeed what you want, then, and assuming CurrentSpeed is in distance/time:

Code:

    Vector3 splinePoint = _splineController.Spline.InterpolateByDistance(_splinePosition, Space.World);

This change should do it. If you still have issues, please let me know.

You are totally right! I had the code done before implementing Curvy Splines 8, so I simply translated to it. I have redone the system to use SplineController instead and it works great. 

[_Aka_]

Glad to read that.
Have a nice day.