I have an alembic of some splashing water. I'd like to use it in slow motion, 20% speed. Is there any way to do that? I believe alembics have no concept of frames, which seems like it should mean it's easy to get them to interpret at a different rate. But I don't see any way to get an alembic that lasts x number of frames to play over x*5 frames.
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$\begingroup$ You could try with time remapping, is under Output Properties > Time Remapping and switch the "New" to something like 200 or 400 , and so $\endgroup$– EmirMar 19, 2021 at 1:50
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$\begingroup$ I tried this. Unfortunately it seems to be doubling frames in my alembic to slow it down, not inventing new in between frames. I did check "Vertex Interpolation" and it doesn't help. Not sure what else can be done. $\endgroup$– Matthew BelinkieMar 19, 2021 at 14:57
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2 Answers
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Yes, I've just needed to do the same... Turn on and keyframe "Override Frame" value in MeshSechuenceCache modifier where are the alembic data options. First keframe 0 - on frame 0 and second keyframe 100 on frame 100(if you alembic has 100 frames). Then go to graph editor and turn of "Only show selected" tick on the righ top panel. Find your custom alembic curve and adjust it how ever you need.
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2$\begingroup$ Even your answer is correct for Object animation ... I would say - there isn't a way to generate interpolation between two frames of exported fluid sim. Data in Alembic are frame by frame (same in blend), where meshed fluid object is using completely new vertices for each frame so there is not a way to calculate vertex position in between ... it means for slowmo x*5 frame - same water shape for all those frame. $\endgroup$– vkliduJul 28, 2021 at 19:18
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Just a little more clarification to this process.
The Override Frame feature is basically allowing you to adjust how many frames from the alembic file will play over time. By default, ticked off, it means the file will play as recorded from the start to the end. For example from frame 0 to 100.
Override Frame means you can now set this manually. So if you set keys at 0 and 100 and at the keyframe of 100 you set the value of 100, this means it will play in the normal time.
However if at frame 100 you set a value of 50. This means it will take 100 frames to reach 50 frames of the alembic animation. So this would be 1/2 speed.
So this also means that the animation will stop at 50 frames on frame 100, if you have more frames than 100. And you can speed up as well as slow down the animation with the same method by entering a value higher value, for example 200 at frame 100 to play it 2X as fast from frame 0 to 100. But for this to work, you would need to have 200 or more frames in the Alembic file. Otherwise it will stop playing at frame 50 if you only have 100 frames.
