With Standalone I haves some material problems (no non-standard chars or too long material names etc.), so it's not an option at the moment.
I'm going to make a separate post about it.
I've got a problem with AC20 projects opened in AC21 and running the 3.7.0.76 (64 bit) plugin. It stucks while "Loading Materials from Scene. Please wait..." (even small scenes / after ~30min no progress)
After reinstalling 3.6.4.74: same problem. Ditn't work for a while with AC21, so I ...
Well, I admit that I don't get the 'Cube map' projection (+x, -x, +y, -y...) to work at all properly - not to mention with stereo output.
Up to now, I render first the left, than the right image (spherical [=equirectangular] projection, in Archicad) @ 8.000x4.000 pixels. When Paul will make it ...