Different fov along different axis

[alakhag]

I have intrinsic and extrinsic parameters, using which I can get origin, target and up direction for look_at matrix, and field of view angles and offsets.

However, my image is 480x640 size, and the fov along x-axis and y-axis are different.

I want to use perspective camera, but it only allows one value for fov.

[njroussel]

Hi @alakhag

I'm a bit confused by your problem.
Given the field of view of a single axis and the aspect ratio of the film, you can compute the other axis's field of view. Here's the source code of how we do this: https://github.com/mitsuba-renderer/mitsuba3/blob/master/src/render/sensor.cpp#L149-L203

The perspective plugin also takes a fov_axis where you can specify diagonal if that's easier for you.