Concatenating batch-wise traced paths

[naperman]

I wan't to call scene.trace_paths() batch by batch in a loop and them accumulate(concatenate) the traced paths after every iteration of the loop. The traced paths is a complex object with several tensors as properties and with batch_size position different in order for the different properties. Is there an easy way to concatenate along batch_size for all properties of traced paths?

The idea is to precompute traced_paths for a large number of UE's sampled on a scene, but by breaking up the compute into runs where traced paths are computed batch by batch. The final combined traced paths object is fed into a train function and reused for calibration of the ray tracer.