Comment by a012

6 hours ago

I’m no expert but this sounds like a digital version of the anamorphic lens/system, doesn’t it?

It is.

Some modern films are still filmed with anamorphic lenses because the director / DP like that, and so we in the VFX industry have to deal with plate footage that way, and so have to deal with non-square pixels in the software handling the images (to de-squash the image, even though the digital camera sensor pixels that recorded the image from the lens were square) in order to display correctly (i.e. so that round circular things still look round, and are not squashed).

Even to the degree that full CG element renders (i.e. rendered to EXR with a pathtracing renderer) should really use anisotropic pixel filter widths to look correct.

Yes, and when working with footage shot with anamorphic lenses one will have to render the footage as non-square pixels, mapped to the square pixels of our screens, to view it at its intended aspect ratio. This process is done either at the beginning (conforming the footage before sending to editorial / VFX) or end (conforming to square pixels as a final step) of the post-production workflow depending on the show.