This option allows you to perform a variety of scripts before and after the rendering. Advanced users can, for example, enable or disable the appropriate Asset of particles at render time.
There is also a special version of the script execution – after each frame rendering. This option may be necessary, for example if you want to copy via Maxscript rendered frames into backup folder. This script can be executed on render farm nodes, if file “LPM_node_startup.ms” from distribution LPM is added to max foler folder “3ds Max 20**\scripts\Startup”of each node.
Even if the scripts will contain errors, rendering still happen without their execution.
One passe may contain an unlimited number of nodes “Script”. To avoid confusion, you need to give them a logical, unique names.