Spotted this in the unsupported VrayRT list.. probably pretty low on the list of wishes, but if you’re building it for vrayrt… 
Viewports:
Orthogonal viewports are not supported. Only perspective and camera views are supported. Support for user views and orthogonal cameras will be added in an update.
I’d like to be able to either render out orthographic VrayCameras, or have a separate way to ‘override’ the exposure of a regular max camera so that i don’t have to modify the lighting in the scene just to render out an elevation/ortho type view.