Batch server rendering errors: how to catch through scripts?

[Vitali Crystal]

Hello,

I am kind of lost and I need your help. I know that I can do batch rendering through 'render' command and it will also allow me to run callbacks (such as after each frame is rendered). I can even import a python script and run that script as my callback. With that i have no problem.

However: how can I detect when a frame, for example, fails to render and batch rendering stops? Is it detectable through a callback that runs after each frame is rendered? If not, how can I do it? I need it because if such an event occurs, I need to clean up the database, and mark all entries, each corresponding to a frame of the scene, as 'errored'. I can't do it unless I can detect an error through a python script. Can anyone help me? I have already spent hours searching online and have no clue where else to search. Is it even possible?

[Justin Israel]

Do you mean you are running them from a command via via "Render"? If so, a failed render should return a non-zero exit status, which you would look for. 

The post callbacks don't seem to run on failure.

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[Vitali Crystal]

Yea, though I will most likely run a .bat file from C++ code; I might also run it through Python too, but in any case, I guess the only way to check for failure is to get an exit status after running .bat file, right?  This is indeed not perfect, but oh well : (   So, I have to imagine, Maya has no way to render multiple layers not through batch render, does it?  

Because another way I was thinking is to start a maya service itself and then render layers, but I guess now it does not really matter, render command is probably better.

Thanks for the help!

[Justin Israel]

Any wrapper scripts would need to properly convey the exit status so that you know if your process succeed.

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[Vitali Crystal]

Thanks for the reply!

I have one last question - when render command is being run, what happens is on the back-end new Maya process is started and a scene is loaded before being rendered, right?

I wonder, however - I know there is a command called batchRender in Maya - and i can run it for individual layers. But if, say, I loop through all layers and run that command on each, does it mean Maya will load a scene every time?  Can I run it such that it will use the current opened scene?

[Justin Israel]

Ya every time you call render, it will do a maya batch, spinning up an instance, loading the scene, and doing the render. 

If you are trying to make a "server", maybe one option is that you spin up N number of non-gui interactive Maya's, and then feed it work over a commandPort. Or a Maya standalone via python and do the exact work you want. 

As far as I know, the straight up render commands do their run with the given flags, and exit.

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