Ease In and ease out
Posted: Thu Feb 22, 2018 1:25 am
Sorry if this has been answered before. If it has, I couldn't find it, so please feel free to just point me there.
This is a question for the animation pros Typically I use the smooth and step interpolation for most things, however I was just playing around with ease in, ease
out and ease in/out. I've used them before, but haven't analyzed them very much.
I know how to use bezier or add my own keyframes to get whatever interpolation I want, but I just wanted to see what the animation pro's think about "Ease In" and "Ease Out".
I've created a little video here
They don't look that good to me ("Ease Out" in particular), but I'm in no way an animation pro, so maybe I just don't understand, which is why I'm asking.
So here are my questions, assuming you set interpolation on keyframe 1 and your moving to keyframe 2.
1) Are the names in the right order?
Based on the Animators Survival Kit (expanded edition pg 38), I thought that "Ease In" would appear slower as it approaches the second keyframe. Conversely I expected "Ease Out" to appear slower as it leaves the first keyframe. This seems to be the opposite of the behavior I see.
2) How _should_ they compare to linear?
I would have expected "Ease In" to match "Linear" on the first half of the motion and "Ease Out" to match "Linear on the second half of the motion. My thought is that the middle key frame would be the same for all. However, I can understand if the motions don't exactly work that way. Rather than having a linear portion in each, it looks like "Ease In" and "Ease Out" are just variants of S-curves. I'm guessing that this is a limitation of the software, but with bezier curves I would have expected a bit better match.
3) Is "Ease Out" the most problematic?
Even if the names are not correct, and I just allow for that, it seems like "Ease In" is a fairly reasonable approach. But "Ease Out" seems pretty messed up, because it's faster then "Ease In", in both the beginning and the end It basically seems like it should be quite a bit slower at the end.
I realize this is a bit theoretical or just a convenience point, because we can achieve whatever we want with different approaches, but I'd appreciate some insight as I try to learn a little more about proper animation.
Thanks for the input.
Edit
Well, I did just see a problem with bezier If I move the key frames the handles don't move in the way I'd expect. Meaning, if I want to shorten or lengthen the time I have to redo the bezier handles in the motion graph (at least that's the best I've found so far). In case people are wondering, I was trying to animate a hang glider flying in the air. I want it to swoop down. I have a fix of sorts, use a two bone rig with independent angle for the second bone. Maybe there's a better way, but it would be nice to have "Ease In" and "Ease Out" not compress at both ends. If anyone knows a solution to that I'd appreciate the insights.
This is a question for the animation pros Typically I use the smooth and step interpolation for most things, however I was just playing around with ease in, ease
out and ease in/out. I've used them before, but haven't analyzed them very much.
I know how to use bezier or add my own keyframes to get whatever interpolation I want, but I just wanted to see what the animation pro's think about "Ease In" and "Ease Out".
I've created a little video here
They don't look that good to me ("Ease Out" in particular), but I'm in no way an animation pro, so maybe I just don't understand, which is why I'm asking.
So here are my questions, assuming you set interpolation on keyframe 1 and your moving to keyframe 2.
1) Are the names in the right order?
Based on the Animators Survival Kit (expanded edition pg 38), I thought that "Ease In" would appear slower as it approaches the second keyframe. Conversely I expected "Ease Out" to appear slower as it leaves the first keyframe. This seems to be the opposite of the behavior I see.
2) How _should_ they compare to linear?
I would have expected "Ease In" to match "Linear" on the first half of the motion and "Ease Out" to match "Linear on the second half of the motion. My thought is that the middle key frame would be the same for all. However, I can understand if the motions don't exactly work that way. Rather than having a linear portion in each, it looks like "Ease In" and "Ease Out" are just variants of S-curves. I'm guessing that this is a limitation of the software, but with bezier curves I would have expected a bit better match.
3) Is "Ease Out" the most problematic?
Even if the names are not correct, and I just allow for that, it seems like "Ease In" is a fairly reasonable approach. But "Ease Out" seems pretty messed up, because it's faster then "Ease In", in both the beginning and the end It basically seems like it should be quite a bit slower at the end.
I realize this is a bit theoretical or just a convenience point, because we can achieve whatever we want with different approaches, but I'd appreciate some insight as I try to learn a little more about proper animation.
Thanks for the input.
Edit
Well, I did just see a problem with bezier If I move the key frames the handles don't move in the way I'd expect. Meaning, if I want to shorten or lengthen the time I have to redo the bezier handles in the motion graph (at least that's the best I've found so far). In case people are wondering, I was trying to animate a hang glider flying in the air. I want it to swoop down. I have a fix of sorts, use a two bone rig with independent angle for the second bone. Maybe there's a better way, but it would be nice to have "Ease In" and "Ease Out" not compress at both ends. If anyone knows a solution to that I'd appreciate the insights.