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For others, this is the previous discussion:
https://esotericsoftware.com/forum/d/24255
In that thread in post 13 I showed how value timing looks in 4.1 and how it differs from 3.8. It is more similar to 3.8 in 4.2!
When the line of the handles through the key is straight, the curve transitions smoothly when it reaches the key. In 3.8 the handles were not kept straight: you adjusted each curve separately, without affecting neighboring curves by changing their handles to keep them straight through the key. This creates a "cusp" where the transition of the curve changes abruptly at the key. If I understand correctly, that is the behavior you want. Is that right?
You can do that in 4.2 by separating the handles. For example, given this curve:
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If you move the middle key right 20 frames using shape retiming:
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Value retiming:
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No retiming:
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Now let's separate the handles and move it with shape retiming:
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Value retiming:
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I believe that last one is the same behavior you get in 3.8. I think that is what you wanted? I don't think it is a good idea though. Most of the time you shouldn't think of each curve separately, you should instead think of the entire curve for the whole animation. Handles should usually be straight through the keys, so you have smooth transitions. When you need a sharp change in motion, then you'd separate the handles as shown above, but it's much less common.
