Potential typo in `sample_perspective`: `tgt_fov_max` instead of `tgt_fov_x_max`

[maoxindong123]

Hi, thanks for your great work!

I was reading through the code and noticed a potential typo in the sample_perspective function. In this line:

tgt_fov_x_min, tgt_fov_max = max(np.deg2rad(fov_range_absolute_min), tgt_fov_x_min), min(np.deg2rad(fov_range_absolute_max), tgt_fov_x_max)

Should tgt_fov_max be tgt_fov_x_max, or did I misunderstand?