Do ease-in and ease-out only work with a path?

- Ron T.

Nope, they can be used for any motion

Chris

iClone training resources  https://forum.reallusion.com/Topic70771-161-1.aspx

                                                                                               

    

Okay, then I'm having a bit of a problem trying to see results. Here's what I did:

1) added a 3D block to a blank scene,
2) set a key frame on frame 1 (object at X = -300)
3) set another key frame on frame 100 (object at X = 0)
4) set a third key frame on frame 200 (object at X = +300)

I then made frame one the current frame and set ease-in so the object would accelerate. I saw no difference in the speed of the object. In other words, there was no acceleration.

I also tried setting the first key frame to ease-out. Same result.

The difference in the object's position from frame to frame is the same (about 3 units) whether the key frame is linear, ease-in or ease-out.

Obviously, I'm missing something. Any idea what?

EDIT: I just made a few changes... I deleted the keyframe at frame 100 and set frame 200 to ease-out. The ease-out is there, but the ease-in on frame 1 still isn't.

- Ron T.

I've noticed too that ease-in doesn't seem that effective, unless I'm missing something as well.

I've been using a little trick for a manual ease-in: After you set up your movement, add one or more keyframes after the first one and space them out by moving them to the right. You are basically creating a curve (in time) with line segments. It's obviously a workaround.

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Yup, that's a good tip. When I first tried ease-in/ease-out a week or so ago and it didn't look like it was working, I did a bouncing ball that way.

EDIT: For the current test, I also tried putting a "dummy" key frame at frame one and moving the ease-in to frame two. Same results.

- Ron T.

Sorry for the less than informative reply. Try setting up the ease in and ease out in reverse of what you want to do. I seem to remeber hearing they were backwards.

Cheers,

Chris

iClone training resources  https://forum.reallusion.com/Topic70771-161-1.aspx

                                                                                               

    

Hi Rivit,
the names on the function curves are a bit misleading. To avoid confusion, look at the icon drawings. those are the correct graphs.
1) if the line is flat and starts to climb fast, that is equal to ease-out if you apply it to keyframe one but it is also fast in if you apply it to keyframe two.

2) if the line drops fast and become straight that is fast out if you are applying it to keyframe one but it is also ease-in if you apply it to keyframe two.

3) if the line goes up fast and flattens and then goes up fast again, that is ease-in ease-out. this is the kind of curve you put on the second keyframe of a bouncing ball if you have three keyframes to make it bounce. In other words, the ball will decelerate as it reaches the peak of the bounce.

Hope this helped,

Stuckon3d

PS: BTW i explain all this in detail and more in my animation tutorial part one. Its a three hour tutorial download for $25 bucks if you are interested. .



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I have been noticing this problem since I first got iClone but haven't said anything. I have tried the extra keyframes idea and all conceivable permutations but I have never gotten ease-in to do much at all. Maybe stuckon3d has the answer....hope hope!


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Thanks Seeker769, animagic, mark and stuckon3d for joining in this discussion and trying to help me solve this.

Yes, the names are confusing for the uninitiated. Ease-in doesn't mean "ease into the keyframe" it means "ease into the motion." I remember a long, heated discussion about this in one of my first animation classes in college, how it sounded backwards and all. But the professor beat it into our brains through shear repetition and we all (finally) saw his point in the end.

I've zipped and attached a simple project file containing one object with two key frames. Frame one has an ease-in transition and frame 100 has an ease-out transition.

I've simplified this project file as much as I possibly can in an effort to make sure no "restrictions" are getting in the way. What I mean by "restrictions" is: while pondering this, I thought maybe the reason it wasn't working was because there were other transforms in that key frame besides a simple starting position. I had originally brought the object in at the world origin, moved it to its starting point and resized it. This meant there were actually two changes made to the object in that one key frame, size and position.

For this example project, I brought the object into the scene and didn't move it, didn't resize. I just double-clicked to add a key frame at frame one, then set it to ease-in. Then I went to frame 100, moved the object and set that key frame to ease-out. The results were the same. Frame 100 works; frame one doesn't.


- Ron T.

Hi Ron,
maybe this will help you visualize how the function curves work in iclone. Imagine three points connected by two curves/lines.
The first point has only one curve connected to it on the right,
Point two has one curve connected on the left and one on the right.
Point three only has one curve connected to the left. .

Now with this in mind, ease in, linear, and ease out: These refer to the curves to the left of the point.

So if point one/keyframe one is at frame one of the timeline. There is no curve available to the left of the keyframe, that is why nothing is happening there. And that is the reason why it works on point two of your animation, because you do have a curve to the left of point two.

Hope this helped,

Stuckon3d



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