Hiya, I have been looking to see if pre rendering the motion vector method ie in the ‘Controls’ tab in the Motion Vector Map, using Forward/Backward, Forward, Backward. I’ve found that the results differ from the Analysis.
I’ve cached my clip with a motion vector map, then output it from the Action by turning on the Motion vector pass button. Then using that as a front and matte input into a second Action (I’ve put the backwards into the matte, selecting 2 motion vector outputs and turning on the backwards button for the second) and pulling it in as a motion vector map and changing in the control tab from Analysis to Forward/Backwards. Its close don’t get me wrong but its not the same, so my key frames are off.
When I pull the initial cached motion vector pass that was in the first Action I can see it has 8 channels. Is this why its not going to match? Because the pre render way only has 2, Forward and Back. I’ve tried outputting it as a multi channel 8 layer file but its doesn’t have a Motion wrapper so when I pull it in as a Map it says its not recognized as a Motion Vector Map.
My cache time is down when you pull it in with the Forward/Backwards function so it seems like it could be a good way to use the motion vector as sometimes it drops the cache (always happens last thing at night).
Has anyone had any success with the pre render workflow?