rj-action-library-godot-development-project/Scripts/GameJam/Player/RotateCharacter.cs

using Godot;
using Rokojori;

namespace GameJam
{  
  [GlobalClass]
  public partial class RotateCharacter:Node
  {
    [Export]
    public Node3D cameraSource;

    [Export]
    public Node3D player;

    [Export]
    public RJSensor up;

    [Export]
    public RJSensor down;

    [Export]
    public RJSensor left;

    [Export]
    public RJSensor right;

    [Export]
    public float rotationSpeed;


    public override void _Process( double delta )
    {
      var y = up.GetValue() - down.GetValue();
      var x = right.GetValue() - left.GetValue();

      var v = new Vector2( x, y );

      if ( v.Length() < 0.4f )
      {
        return;
      }

      var directionZ = y * cameraSource.GlobalBasis.Z;
      var directionX = -x * cameraSource.GlobalBasis.X;

      var normalized = ( directionX + directionZ ).Normalized();
      normalized.Y = 0;

      var rotationBefore = player.GlobalBasis.GetRotationQuaternion();
      
      player.LookAt( player.GlobalPosition + normalized * 100f );

      var rotationAfter = player.GlobalBasis.GetRotationQuaternion();

      var lerped = rotationBefore.Slerp( rotationAfter, rotationSpeed );

      Math3D.SetGlobalRotation( player, lerped );
    }

  }
}