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Back after a long time. Very stressed and need to go to sleep so.. I'll make it short ^^;

I am working on short animations with transparent backgrounds, in order to superimpose the clips over videos taken in real life. They'll be, maybe, a few seconds long. Most of them will only take over a small section of the screen, OR take over different parts of the screen (as in, the size will change). An object flying towards the screen and out of sight would start off tiny, then move to take over 1/3 of the screen, then disappear. See?

Problem is, as you'd know, Blender renders the empty space (often over 95% of the screen), wasting tons of time. My PC is not the best. Rendering one frame at 1080p takes over 2 and a half minutes. (The test project I'm doing is 60 frames, but It could always get longer so.. I'd like to get a solution right now)

If the object was stationary, I could just use the Render Region and be done with it. But it moves, which means I need to animate (keyframe) my Render Region! I've looked this up and there seems to be ONE person who actually made this possible, Markus from Blenderartists.org. He wrote a script that makes Render Regions keyframable, perfect for my issue. However, it seems to be outdated. Entering the script into Blender's Python console leads to a long sting of errors: errors

There seems to be an add-on on sale for $6~7 that does this, but that's a last resort. Are there any ways I can animate/keyframe a Render Region?

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  • $\begingroup$ blender.stackexchange.com/questions/44504/… blender.stackexchange.com/questions/61419/… blender.stackexchange.com/questions/32127/… $\endgroup$
    – Duarte Farrajota Ramos ♦
    Commented Jun 11, 2021 at 15:29
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    $\begingroup$ Hi :). If the background is transparent, simply check "adaptive samples" and Cycles will only use 1 sample on transparent areas $\endgroup$
    – jachym michal
    Commented Jun 11, 2021 at 16:18
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    $\begingroup$ Related: How to speed up rendering of transparent areas $\endgroup$
    – jachym michal
    Commented Jun 11, 2021 at 16:20
  • $\begingroup$ @DuarteFarrajotaRamos Your first link was not relevant, 2nd and 3rd link simply led me to the add-on which I already mentioned here. Thanks, but not the answer I was looking for! $\endgroup$
    – BeardWix
    Commented Jun 11, 2021 at 23:57
  • $\begingroup$ and @JachymMichal , thanks so much! Enabling that option made render times go from 2m 40s to 1m 40s. Not bad! (I tried removing the shadow catcher and lamp in the scene in hopes that it would quicken the speed, but that didn't work, haha.) Do you have any suggestions to quicken it up further? And do you mind putting your answer in a separate "answer" so I can select it as correct? :) $\endgroup$
    – BeardWix
    Commented Jun 12, 2021 at 0:01

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