I originally drew grease pencil sketches of position as well as scaling. Then I animated the ball and it turned out that the position sketches are possible to follow (after tweaking the graph), but the scaling sketches are not because of bad timing (they were too close, or too fast). So for scaling, the only way I found possible was to scale the ball “by eye”, disregarding the original scaling sketches completely (and I deleted them). I think that sketches can’t be too detailed.
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