writing to stdout using a python node

[berniebernie]

Hello

I'm sending alembic rops to hqueue and there's a lot of preroll. Even with alfred-style progress turned on, I have no feedback on what's going on.

I was thinking that I could add a python node to write to the stdout (which I though would show up in the hqueue logs) like so:

     import sys
     f= hou.frame()
     sys.stdout.write('frame: '+str(f) + '\n')

But it doesn't work. Any ideas ?

When I start houdini with the -foreground option (so that the shell it launches from doesn't spawn a new process and should receive outputs) and write to stdout, it only shows up in the python console

 

Thanks

[dennis.albus]

Hey,

I had the same problem with Tractor. Here's what worked for me in the end (no warranty that it also works with hqueue).

The script is run as a post-frame-script in the alembic rop.

import sys

start = hou.node(".").parm("f1").eval()
end = hou.node(".").parm("f2").eval()
current = hou.frame()

progress = str(int(hou.hmath.fit(current, start, end, 0.0, 100.0))).zfill(3)

print("\rFrame {0} done".format(current))
print("\rALF_PROGRESS {0}%".format(progress))
sys.stdout.flush()

It seems that both the carriage returns AND the flushing are necessary. If any of this is missing I will only get the information in the log when the whole caching process is done.

Hope this helps,

Dennis

Edited June 1, 2016 by dennis.albus

[berniebernie]

13 minutes ago, dennis.albus said:

Hey,

I had the same problem with Tractor. Here's what worked for me in the end (no warranty that it also works with hqueue).

The script is run as a post-frame-script in the alembic rop.

import sys

start = hou.node(".").parm("f1").eval()
end = hou.node(".").parm("f2").eval()
current = hou.frame()

progress = str(int(hou.hmath.fit(current, start, end, 0.0, 100.0))).zfill(3)

print("\rFrame {0} done".format(current))
print("\rALF_PROGRESS {0}%".format(progress))
sys.stdout.flush()

 

Hope this helps,

Dennis

Thanks for the snippet, it actually works in hqueue now, even the simple print, in a python node (instead of the alembic rop which only fires when a frame is written, not during preroll).

My problem was that my python node was after the dopnet which was simulating, so it never fired during preroll. Silly me.