How to transfer camera focal lenght to fov params in pytorch3d?

[lucasjinreal]

In pytorch3d , it only have fov params:

T = T.unsqueeze(0).repeat(BS, 1)
                new_cam = FoVPerspectiveCameras(zfar=1000, znear=0.05,
                    R=self.default_R, T=T, fov=self.fov, device=self.device)

However, I just got focal lenght params, how to send it to camera as an equal result with fov?

[bottler]

In general, for square images, you have 1/(focal length in ndc) equal to tan(0.5*fov).

[lucasjinreal]

@bottler what about none-square images? In more general way to ask this question, if I have a human mesh model which trained on the hyposis of focal_len = 50, then how should I visiualize this model prediction output with fov params?

my input image could be rectangle.

[lucasjinreal]

Or, does there any other Camera class except this FoVPerspectiveCameras which can take focal_len as camera params?

[bottler]

Yes. If you don't want to provide fov, you can use PerspectiveCameras.