...
This setting is only useful in case of animation export. ArchiCAD animation features are limited, usually the geometry doesn't change between the frames only the camera position or the sun settings. It means you can save a lot of memory and export time if you export geometry only for the first frame, and for the other frames you only reference this geometry (via Maxwell Reference MXS). We recommend to keep this flag ON!
Export multi-references as instances
In case this flag is ON and you have many referenced MXS scenes with the same source file in your ArchiCAD project, the plugin exports only the first one as normal object and the others as instances. It can be very useful for example if you create a forest with similar mxs trees. The benefit is the much less memory consumption during render time. It is important to note here that if you have enough memory the render speed is usually better with normal objects.
FIRE tab
You can set the main render parameters for the FIRE mode.
...