[Bf-python] Rendering from scripts (Blender 2.53)

[Simon Jagoe]

Hi all,

I am working on a Blender (2.53, SVN r31098) script that is intended
to be a long-running process, listening for commands and manipulating
a .blend file based on these commands. I have a problem when it comes
to making this long-running Blender process render the scene and save
the output.

I am able to render and save the output once, but Blender then stops
responding to any further commands. I have a stripped down example of
this (with all IPC removed).

First, can somebody tell me how I should be rendering from a script?
What I am doing at the moment is this:
 >>> bpy.ops.render.render()
 >>> bpy.data.images['Render Result'].save_render(filepath=output)

Attached is a simple script that reproduces the problem. In my test, I
was running the script against the default scene. As soon as I try to
do the second render in the attached example, Blender freezes and I
never get the second render.

So far this is the only way I have found to di this. Any help would be
greatly appreciated.

Thanks,
Simon
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