random result with compute_paths

[bitipi]

It seems that the compute_paths method gives random results for the same scene and the same phenomena

[faycalaa]

Hi @bitipi,

Could you share a minimal code snippet that reproduces the issue?

[bitipi]

testbelfort.zip

[faycalaa]

Unfortunately, we cannot download and uncompress zip files.

Could you please provide a minimal reproducer inlined in the GitHub message? It could use one of the built-in scenes from Sionna.

[jhoydis]

Which version of Sionna do you use?

[bitipi]

sionna==0.19.1

[bitipi]

i need diffraction

[bitipi]

I'm getting back to you regarding Sionna's ray tracing, which seems to exhibit random behavior.

Just take a transmitter and a receiver that require several phenomena to be reached to see that different paths are found over 10 executions of the Python script.

I'm using 0.19.2 because we need diffraction.

I'm working with a CPU.

I'm working at Orange Lab France.

is sionna a ray lauching or a ray tracing model?

Thank you.

[oxelarnal]

Have you tried to use the "seed" parameter?
This is an example:

paths = solver(scene=scene,
                   max_depth=3,
                   los=True,
                   specular_reflection=True,
                   diffuse_reflection=True,
                   refraction=False,
                   synthetic_array=False,
                   seed=42)

If you fix the seed, you should get the same results.