vray standalone render fails when run from inside python on linux

[willanielewicz]

Im trying to run a os.system() or subprocess.call() in python to execute vray standalone.
It always fails.
When I run the exact same command line in a shell terminal the render works.
Ive tried to create a render.bash script file in python. and run it from inside python
with os.system('/bin/bash render.bash') or subprocess.call('/bin/bash render.bash, shell=True) but the render fails.
There is no error message created..

Any ideas?

[Joelaff]

I am just guessing here, but perhaps you have some resources limits (memory or cpu) configured for python, or the active user? Then the spawned processes inherits these limits and fails...???

[willanielewicz]

Turns out it was my mistake.
The python script was writing a text file just before the system call to vray.
The text file was a list of vrscene files that were to be used in rendering.
Multiple #include lines.
That text file was not being properly closed() just before the system call to vray.
Once I made sure it was closed() vray stand alone rendered correctly.

[Joelaff]

Turns out it was my mistake.
The python script was writing a text file just before the system call to vray.
The text file was a list of vrscene files that were to be used in rendering.
Multiple #include lines.
That text file was not being properly closed() just before the system call to vray.
Once I made sure it was closed() vray stand alone rendered correctly.

Glad you figured it out. Without closing (or flushing) it likely hadn’t actually been written to disk yet.