KavTest/KavTest/Engines/MoveAlongCurve3DEngine.cs

using Encompass;
using KavTest.Components;
using KavTest.Messages;

namespace KavTest.Engines
{
    [Sends(typeof(TranslationMessage))]
    [Writes(typeof(MoveAlongCurve3DComponent))]
    [QueryWith(typeof(MoveAlongCurve3DComponent), typeof(Transform3DComponent))]
    public class MoveAlongCurve3DEngine : Engine
    {
        public override void Update(double dt)
        {
            foreach (var entity in TrackedEntities)
            {
                ref readonly var movealongCurveComponent = ref GetComponent<MoveAlongCurve3DComponent>(entity);
                ref readonly var transformComponent = ref GetComponent<Transform3DComponent>(entity);

                var newCurve = new MoveAlongCurve3DComponent(
                    movealongCurveComponent.Curve,
                    movealongCurveComponent.Time + (float)dt
                );

                SendMessage(new TranslationMessage(entity, newCurve.Position - transformComponent.Transform.Position));
                SetComponent(entity, newCurve);
            }
        }
    }
}