Question about default source camera and the render camera setting.

I noticed that only when source camera following the setting that azimuth=270, elevation=0, the triplane would render the same image as input under input pose.
My question is, when I have a image under pose $T_0$, and I want to render a image under pose $T_1$. How should I adjust the render camera?
I've tried to get the ref_pose $T_2 = T_dT_0^{-1}$ where $T_d$ is the default pose, and convert $T_1$ with ref_pose, but it totally gives an wrong image.
In my setting, the camera distance is 1.5, and the input azimuth is 2.3562(rad), elevation is -0.1317(rad)
the target azimuth is 0, elevation is 0.52359878.
The input image
And the target image
Both two image are rendered by blender.

Start by reading the implementation of the source-camera and render-camera settings, then trace how the input and target poses are converted using the stated camera distance and azimuth/elevation values. Reproduce the mismatch with the supplied images and determine the correct pose adjustment; done means the camera relationship is clearly documented and produces the requested target view.

Written by the indexing model from the issue text.