Software does not know how your machine is assembled, how axes are linked or chained. 3D display for rotational axes is just one (most simple) possibility.
It is possible to show 3D representation of your machine with help of 3dObj file. With this you can accurately show machine model in motion.
Can you send me your profile, gcode and screenshot of CAM to our support email and I'll check if there is anything I can do to improve this generic 3d display.