Ralf, after examining the options- SBS is probably the best option for 3d TV/Projectors. Of the HDMI 3d formats, Frame Packed for resolution is the best – but one is stuck at 24 fps. Ok for movies and maybe relatively low action experiences. SBS gets up to the more satisfactory 60 fps, but often drops to 720p per eye.
What’s annoying is with 4k Projectors- even passive projectors could theoretically support full 1080p for both eyes. I hope projectors hold their 3d ground and not get dismissed as a fad. Full SBS (1080p per eye) may be worth exploring – but so much of the display hardware must have software that supports these features. It seems to be more of a player issue – which vorpX could resolve.