Why the loc_elevation is not updated in the env?

[ZuoJiaxing]

R2R-EnvDrop/r2r_src/env.py

Line 265 in c416108

loc_heading = normalized_heading - base_heading

I'm curious about why the elevation of the navigable candidates is not updated as the heading, such as:
loc_heading = normalized_heading - base_heading
loc_elevation = normalized_elevation - base_elevation

[airsplay]

The normalization guarantees that the location is related to the current "front" view. In the paper of Speaker-Follower Models for Vision-and-Language Navigation, the "front" view is always set with elevation=0. We follow the practice here.