Camera Map projections with unique aspect ratios in 3DS Max without plugins

Dave Wortley has released a handy Maxscript that can create Camera Map projections (including CameraMapPerPixel) of different aspect ratios without needing to use 3rd party plugins or shaders.  It works by scaling the camera itself to compensate for the difference between the render aspect ratio and the projected texture’s aspect ratio. 

You can read more about the script on Dave’s website and download it from Scriptspot.