How to wait for bpy.ops.render.render?

Archive Python API
1

Hey

I’m sending a loop of jobs to render and I use this command as my drive >
bpy.ops.render.render(ctx, "INVOKE_DEFAULT", animation=False, write_still=True)

However as I do print before and after the command, I can see both prints happen instantly, and render does not block the execution of loop. What command can I use to “wait for render end/cancel” so that I can properly execute the loop?

Right now if I send 10 renders, only 1 will render, as the remaining 9 will run while the 1st one renders… Also any scene changes are also incorrect… sigh. Ideas?

TIA

2

You can remove “invoke_default” and it will work, however it will also show no rendering progress bar and it will freeze the UI until all the renders in the loop are done

3

There are handlers like render_post, render_finished, frame_post, etc.
https://docs.blender.org/api/current/bpy.app.handlers.html#bpy.app.handlers.render_post

The page shows how to add a handler for a particular event.