Crossposting this from another thread in hope to get some help.
I followed Andy Mees' advice, which worked... errrr... some. Here is how it was:
Andy's advice (16 Sept., 2022):nest any magic mask generation operations inside a Compound Clip ie create a compound clip from the source clip instance, open the compound clip in its own timeline, add the magic mask to the source image as needed, generate the mask cache, and then finally step back out to the parent timeline... thereafter, when you manipulate the pixels of the compound clip, you are manipulating a separate pre-masked object rather than manipulating the pixels of the source clip itself (ie the mask input), thus the mask is preserved. Do be aware though that nesting magic masks inside compound clips comes with the current drawback that such contained masks can be 'hidden' from other standard software operations. Eg Using the Magic Mask >> Regenerate Object Mask > All Clips function at the main timeline level will not regenerate masks for any such nested clips; similarly, the automatic mask regeneration that's triggered via the Delivery Page 'Render' command will skip any nested masks.>>FF>> Fast Forward to September, 2023. Davinci Studio 18.5.
I'm having a longish (about 30 seconds) clip that I have to use MM twice on.
First, I need to color correct the object in the foreground, separating it from the rest of the picture.
Second, I need to split the clip into three parts of about 10 secs each.
Third, I need to take one of these parts to Fusion, once again MM-out the same object, and make a 3d text orbiting around it.
A bit of explanation: I don't want to color correct in Fusion, as there are other clips that need to be colorized the same way, and I want to do the coloring on a timeline basis. Besides, when I tried color correcting a MM-separated object in Fusion, there were more surprises, like Lift and Gamma worked as they should (on the object only), but Contrast kept working on the whole frame, as if the object wasn't selected.My actions:
For the First, I do as advised: compound the whole clip, open in timeline, MM the object, colorize it to my liking, all good, back to main timeline.
For the Second, I split the compound clip - so nice, nothing is lost, everything stays in place. But I'm rejoicing a bit too early, because...
When I
proceed to the Third, and open the needed fragment in Fusion, create MM node, draw the mask, and click "track" - nothing happens. The node doesn't blink green, no tracking occurs, no matter what I do (restart DVR, reboot the computer, toggle between Better and Faster MM modes, etc., I literally tried every option available).
Looks like Fusion doesn't like applying MM to compound clips to which MM had already been applied somewhere upstream.
I'm just going to get done with color correcting part, then render the result in max resolution in mfx format, then bring it in, and use it for Fusion... A totally stupid way, but nothing is too stupid when you're using DaVinci Resolve, I guess...
UpdateMy timeline was in 1080 resolution; I want to render the clip out in 6K (the footage is shot in 6K);
So I changed the timeline settings, and adjusted render settings in Deliver tab;
Now as part of "delivering", DVR is re-tracking the MM all over again.
This is the first time I'm seeing Magic Mask Tracking floating window in Deliver tab.
Looks like there are still so many more surprises coming.