Basic tutorial

Launch the script (Drag and drop this file in 3ds max viewport) !
You can now set up the general parameters, choose the camera and objects you want to export. To delete all object in a list, use the button RAZ. To delete an object in a list, double-click on it !

Then click on the Export button. Put the After3dsMax.aex file in the After Effects plug-in folder. To import in After Effects, go to " File " > " After3dsMax - Import ". Choose the a3ds file, and... be patient (Can take a while, depending on your scene).
And voila!, you now have your scene in an After Effects composition !

Particular Layer !

Where " Sphere01 " is the name of the 3d layer as emitter.