It would be handy to have the camera viewport represent the spherical camera (if applied) so it’s easier to select a render region when using that camera mode.
I guess this is a 3ds max limitation and would have to be solved on the Max side.
Hi,
sorry, it seems it is not possible. It is not actually 3dsmax limitation, but fundamental realtime rendering limitation - only linear projections (ones that keep straight edges straight in projected image) are supported by rasterization hardware (±).