Yes, its partially possible and already happening .... but going to a level, where only the spires are "expensive" and the res "cheap" would be very hard 8and tedious) to achieve ... and there is much more in that region, which would again rise the mesh density. So, its not worth to try to optimize - for me - this extremely. So yes, I emphasize again: its "sad" but true, that this will only be for high end hardware. Maybe, see it as an "experimental" mesh ...