Brendon
When i click Render! button, Blender is frozen.
Yes, i'm afraid this is the limitation of my python skill and knowledge of Blender render API.
But no worries though, i can assure you that Blender is rendering in the background. Your screen will back to normal once the rendering process finish.
Could i save multiple list of Render Region?
Sure, each list saved with a particular Scene. If you need multiple list, create new Scene.
What Blender version does this add-on will work on?
Blender 2.8 and later.
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