Open Blender and go to Preferences then the Add-ons tab.
Click System then Demo Mode to enable the script.
This is done fromin the File menu, from here you can select a directory which is searched recursively for blend-files to loop over.
There are options as to what to do with each file at the moment the main options are to render or play an animation with options as to how many cycles to play, time to wait after render is done.
The Auto option selects between Render and Play option based on the window layout’s use of image/node editors. If you are happy to use these settings on all files, you can leave the Run Immediately option enabled and confirm.
Adjusting the Configuration¶
If you want to set options per file, you can disable Run Immediately,
during setup and select
demo.py text data-block.
This file has one line per file and settings can be edited and saved with the blend-file.
demo.py is present you only have to go to .
These keyword arguments show up in generated
dict(anim_cycles=2, anim_render=False, anim_screen_switch=0.0, anim_time_max=8.0, anim_time_min=4.0, display_render=4.0, file='foobar.blend', mode='AUTO'),
anim_cycles– Number of times to play the animation.
anim_render– Render entire animation (applies to
anim_screen_switch– Time between switching screens (in seconds) or 0 to disable.
anim_time_max– Maximum number of seconds to show the animation for (in case the end frame is very high for no reason).
anim_time_min– Minimum number of seconds to show the animation for (for small loops).
display_render– Time to display the rendered image before moving on (in seconds).
file– The filepath for the blend-file.
RENDER– what to do on load.
Once you setup a
demo.py you may want to move it to a different system.
In this case the paths might not match up, if so
search_path variable to point to the path on the new system.
You can also set the
search_path to use the directory of the current blend-file:
search_path = "//"
Once the demo starts it will play, render and load different files in the same Blender instance. Since its using a modal operator you can still use with Blender while the demo runs.
If you want to stop Demo Mode, you can press Esc and continue using Blender. To enable again there are three buttons at the right hand side of the file menu to navigate Prev/Pause/Next.
One file can’t play an animation then render, you need to copy the line in
demo.pyand set one mode to
RENDERthe other to
Demo Mode lets you select multiple blend-files and loop over them.
This add-on is bundled with Blender.