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"You can't easily auto-tween a 3D rotation of a 2D character, for example."

Actually, you can. See the previous HN discussion of "Framefree", which decomposes an image into separately moving layers and uses a full mesh morph layer by layer to interpolate between frames. Some ultra-slow motion for sports is done that way.




I assume you mean this? https://news.ycombinator.com/item?id=10052626

That's pretty awesome! I stand by my point that it's not easy, but I'm amazed by how effective that is.




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