We moved the spline rendering code from the component itself to the FSplineComponentVisualizer class. This lets us do all the cool stuff with editing splines in the level. Spline’s now are really intended as a shape that drives some other behaviour, whether it is deforming meshes or animation/spawning other objects. It is no intended as a rendering primitive itself. As was mentioned, we do plan to change SplineComponent back to a PrimitiveComponent at some point, but that is to allow derived classes to implement custom rendering code. Sorry that didn’t make 4.5! I hope that helps clarify things.