GodotComponentTest/components/CollectibleComponent.cs

using Godot;

public class CollectibleComponent : Component {
    private Vector3 targetPosition;
    private bool hasTarget;

    // Called when the node enters the scene tree for the first time.
    public override void _Ready() { }

    public void SetTarget(Vector3 target) {
        targetPosition = target;
        hasTarget = true;
    }

    public void UnsetTarget() {
        hasTarget = false;
    }

    public void PhysicsProcess(float delta, Entity entity) {
        if (hasTarget) {
            if (targetPosition.IsEqualApprox(entity.GlobalTransform.origin)) {
                targetPosition = entity.GlobalTransform.origin;
                entity.Velocity = Vector3.Zero;
            }


            Vector3 targetDirection = (targetPosition - entity.GlobalTransform.origin).Normalized();
            entity.Velocity = targetDirection * (entity.Velocity.Length() + 10 * delta);
            entity.Transform = new Transform(entity.Transform.basis.Rotated(Vector3.Up, delta * 2.0f),
                entity.Transform.origin);
        } else {
            entity.Velocity = entity.Velocity - 9.81f * delta * Vector3.Up;
        }

        entity.Velocity = entity.MoveAndSlide(entity.Velocity, Vector3.Up);

        if (entity.IsOnFloor() || Mathf.Abs(entity.Transform.origin.y) < 0.01) {
            // apply damping when on ground
            entity.Velocity = entity.Velocity - entity.Velocity.Normalized() * 0.9f * delta;
        }

        if (entity.Velocity.LengthSquared() < 0.01) {
            entity.Velocity = Vector3.Zero;
        }
    }
}