Jonathan Mack

There is no resolution scale for the 3d viewer, just make it smaller or lower desktop resolution. 3D views always render 1:1

dlee
The current implementation is indeed vertically rectilinear and horizontally longitudinal, but the implementation is deeply flawed (vertical fov forced to 45 degrees, and produces nonsensical results if the image aspect ratio isn't square). We do not believe it's implementation worth keeping.

is a 'fixed' version worth implementing as a new projection type? not sure what you would call it, "panoramic" maybe? Use vertical aperture/focal to set vertical fov, same as a rectilinear, then derive horizontal fov from aspect ratio? Not sure how a physical widelux type camera actually works.

Edit:
XPan cameras are just wide aspect traditional lens cameras. The panoramic camera I was thinking of is called a "WideLux"

dlee
The builtin cylindrical lens implementation in karma CPU/XPU are... unconventional. It's going to be changed to be orthographic and match mantra behaviour in next major release, but for now, your only option is to use CPU and make a custom lens shader or modify the existing vex script (lens.h).

The current implementation should be kept and renamed though. What type of projection is it? Is it an X-Pan style swinging lens projection? {vertically rectilinear(perspective), horizontally equirectangular(longitudinal)}

Putting a sheet of paper in a coffee can pinhole camera is another type of cylindrical projection, but I think a bit different than the other two.

A Panini projection would be another useful one to have, I think it's also vertically rectilinear but it's horizontally equisolid or some other type of fisheye.